High efficiency ventilation system

A high efficiency ventilation system may include a partition configured to separate a supply air stream and a return air stream, an energy recovery ventilator, a heat recovery ventilator, a refrigerant flow controlling condensing unit, and a direct expansion coil. The refrigerant flow controlling condensing unit may be configured to send a refrigerant to the direct expansion coil and configured to receive a refrigerant from the direct expansion coil. The direct expansion coil may be disposed between the energy recovery ventilator and the heat recovery ventilator. The high efficiency ventilation system may be configured to supply ventilation air to a controlled environment at a particular temperature and a particular humidity.

FIELD OF THE INVENTION

The present disclosure relates to a system for heating, ventilation, and air conditioning, and, more particularly, to a high efficiency ventilation system.

BACKGROUND OF THE INVENTION

Modern heating, ventilation, and air conditioning systems are typically designed to adjust and maintain both a temperature and a humidity of a controlled environment. Some controlled environments, e.g., hospitals, primary schools, etc., require air ventilation in addition to temperature and humidity control. In the heating, ventilation, and air conditioning context, air ventilation is a process wherein air from a controlled environment is continuously replaced with outside air. Organizations such as the American Society of Heating, Refrigerating and Air-Conditioning Engineers have established minimum ventilation rate requirements for specific controlled environments. For example, a new elementary school may be required to ventilate 10.0 cubic feet of air per minute per elementary school occupant.

Compliance with minimum ventilation rate regulations generally increases an amount of energy required to maintain a desired temperature and a desired humidity within a controlled environment. For example, during summer conditions in many regions, a temperature and a humidity of outside air is greater than a desired temperature and a desired humidity within a controlled environment. Thus, continuously supplying outside air to the controlled environment may increase a temperature and a humidity of the controlled environment and additional energy is required to decrease the temperature and decrease the humidity of the controlled environment to the desired temperature and the desired humidity. Accordingly, there is a need to reduce an amount of additional energy required to comply with minimum ventilation rate regulations.

BRIEF SUMMARY OF THE INVENTION

A high efficiency ventilation system is presented. In one or more embodiments, a high efficiency ventilation system may comprise a partition configured to separate a supply air stream and a return air stream, an energy recovery ventilator, a heat recovery ventilator, a refrigerant flow controlling condensing unit, and a direct expansion coil. Illustratively, the refrigerant flow controlling condensing unit may be directly or indirectly connected to the direct expansion coil. In one or more embodiments, the refrigerant flow controlling condensing unit may be configured to facilitate a transfer of a refrigerant from the refrigerant flow controlling condensing unit to the direct expansion coil. Illustratively, the refrigerant flow controlling condensing unit may be configured to facilitate a transfer of a refrigerant from the direct expansion coil to the refrigerant flow controlling condensing unit. In one or more embodiments, the direct expansion coil may be disposed between the energy recovery ventilator and the heat recovery ventilator. Illustratively, the high efficiency ventilation system may be configured to ventilate a controlled environment. In one or more embodiments, the high efficiency ventilation system may be configured to supply ventilation air to the controlled environment at a particular temperature and a particular humidity.

DETAILED DESCRIPTION OF AN ILLUSTRATIVE EMBODIMENT

FIG. 1is a schematic diagram illustrating a high efficiency ventilation system in a heat pump configuration100. Illustratively, high efficiency ventilation system in a heat pump configuration100may be configured to ventilate a controlled environment115in accordance with American Society of Heating, Refrigerating and Air-Conditioning Engineers required minimum ventilation rates. In one or more embodiments, high efficiency ventilation system in a heat pump configuration100may be configured to ventilate a controlled environment115in accordance with International Mechanical Code required minimum ventilation rates. Illustratively, high efficiency ventilation system in a heat pump configuration100may be configured to ventilate a controlled environment115, e.g., high efficiency ventilation system in a heat pump configuration100may be configured to supply air at a controlled temperature and humidity to controlled environment115via a supply air stream142. In one or more embodiments, high efficiency ventilation system in a heat pump configuration100may be configured to control a temperature and a humidity of a controlled environment115, e.g., high efficiency ventilation system in a heat pump configuration100may be configured to control a temperature and a humidity of controlled environment115via supply air stream142. Illustratively, high efficiency ventilation system in a heat pump configuration100may be configured to ventilate a controlled environment115, e.g., high efficiency ventilation system in a heat pump configuration100may be configured to remove air from controlled environment115via a return air stream143. In one or more embodiments, high efficiency ventilation system in a heat pump configuration100may be configured to control a temperature and a humidity of a controlled environment115via return air stream143. Illustratively, supply air stream142and return air stream143may be separated by a partition111, e.g., partition111may be configured to hermetically separate supply air stream142and return air stream143.

In one or more embodiments, partition111may be configured to separate an outside air stream141and an exhaust air stream144, e.g., partition111may be configured to hermetically separate outside air stream141and exhaust air stream144. Illustratively, partition111may be configured to separate a first supply air zone150, a second supply air zone151, a third supply air zone152, a fourth supply air zone153, a fifth supply air zone154, and a sixth supply air zone155from a first return air zone160, a second return air zone161, a third return air zone162, and a fourth return air zone163, e.g., partition111may be configured to hermetically separate a first supply air zone150, a second supply air zone151, a third supply air zone152, a fourth supply air zone153, a fifth supply air zone154, and a sixth supply air zone155from a first return air zone160, a second return air zone161, a third return air zone162, and a fourth return air zone163.

In one or more embodiments, a portion of partition111may comprise a bypass damper configured to temporarily open a hermetically sealed barrier between supply air stream142and return air stream143, e.g., a portion of partition111may comprise a bypass damper configured to temporarily facilitate an egress of air out from one or more supply air zones and an ingress of air into one or more return air zones or an egress of air out from one or more return air zones and an ingress of air into one or more supply air zones. Illustratively, a portion of partition111may comprise a bypass damper configured to facilitate a maintenance operation, a defrost operation, etc. In one or more embodiments, a portion of partition111may comprise a bypass damper disposed between first return air zone160and fifth supply air zone154.

In one or more embodiments, high efficiency ventilation system in a heat pump configuration100may comprise a refrigerant flow controlling condensing unit105, a direct expansion coil110, an energy recovery ventilator120, and a heat recovery ventilator125. Illustratively, direct expansion coil110may be disposed between energy recovery ventilator120and heat recovery ventilator125, e.g., direct expansion coil110may be disposed downstream of energy recovery ventilator120and upstream of heat recovery ventilator125. In one or more embodiments, refrigerant flow controlling condensing unit105may be directly or indirectly connected to direct expansion coil110by a liquid line106and a gas and gas and suction line107. Illustratively, liquid line106may comprise a pipe configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to direct expansion coil110. In one or more embodiments, gas and suction line107may comprise a pipe configured to facilitate a transfer of a refrigerant from direct expansion coil110to refrigerant flow controlling condensing unit105. Illustratively, refrigerant flow controlling condensing unit105may comprise a variable refrigerant volume condensing unit configured to distribute a refrigerant to one or more coil units wherein each coil unit may be configured to control a temperature and a humidity of a conditioned space, e.g., refrigerant flow controlling condensing unit105may comprise a variable refrigerant volume condensing unit configured to distribute a refrigerant to one or more direct expansion coils110. In one or more embodiments, refrigerant flow controlling condensing unit105may comprise a variable refrigerant flow condensing unit configured to distribute a refrigerant to one or more coil units wherein each coil unit may be configured to control a temperature and a humidity of a conditioned space, e.g., refrigerant flow controlling condensing unit105may comprise a variable refrigerant flow condensing unit configured to distribute a refrigerant to one or more direct expansion coils110. Illustratively, refrigerant flow controlling condensing unit105may comprise a compressor170, a fan, and a heat exchanger. In one or more embodiments, refrigerant flow controlling condensing unit105may comprise a refrigerant flow control system configured to control the distribution of a refrigerant to one or more coil units, e.g., refrigerant flow controlling condensing unit105may comprise a refrigerant flow control system configured to control the distribution of a refrigerant to one or more direct expansion coils110. Illustratively, refrigerant flow controlling condensing unit105may be water cooled. In one or more embodiments, refrigerant flow controlling condensing unit105may be air cooled.

Illustratively, energy recovery ventilator120may be configured to recover sensible energy, e.g., energy recovery ventilator120may be configured for temperature recovery. In one or more embodiments, energy recovery ventilator120may be configured to recover latent energy, e.g., energy recovery ventilator120may be configured for moisture recovery. Illustratively, energy recovery ventilator120may be configured to recover sensible energy and latent energy. In one or more embodiments, energy recovery ventilator120may comprise an enthalpy wheel configured to recover sensible energy and latent energy. Illustratively, energy recovery ventilator120may comprise a sensible only energy recovery wheel configured to recover sensible energy. In one or more embodiments, energy recovery ventilator120may comprise an energy recovery wheel configured to recover sensible energy and latent energy. For example, energy recovery ventilator120may comprise an enthalpy wheel configured to recover sensible energy and latent energy. Illustratively, energy recovery ventilator120may comprise a desiccant wheel, e.g., energy recovery ventilator may comprise an active desiccant wheel or a passive desiccant wheel. In one or more embodiments, energy recovery ventilator120may comprise a desiccant molecular sieve coating configured to facilitate moisture absorption. Illustratively, energy recovery ventilator120may comprise a desiccant molecular sieve coating configured to prevent contamination of supply air stream142, e.g., energy recovery ventilator120may comprise a desiccant molecular sieve coating configured to minimize cross-contamination of return air stream143pollutants into supply air stream142. In one or more embodiments, energy recovery ventilator120may comprise a desiccant molecular sieve coating having a plurality of apertures wherein each aperture of the plurality of apertures has an aperture diameter in a range of 0.25 to 4.0 angstroms, e.g., energy recovery ventilator120may comprise a desiccant molecular sieve coating having a plurality of apertures wherein each aperture of the plurality of apertures has an aperture diameter of 3.0 angstroms. Illustratively, energy recovery ventilator120may comprise a desiccant molecular sieve coating having a plurality of apertures wherein each apertures of the plurality of apertures has an aperture diameter less than 0.25 angstroms or greater than 4.0 angstroms. In one or more embodiments, energy recovery ventilator120may comprise any type of desiccant, e.g., energy recovery ventilator may comprise a silica gel desiccant, an oxidized aluminum desiccant, etc.

Illustratively, energy recovery ventilator120may comprise a fixed-plate heat exchanger, e.g., energy recovery ventilator120may comprise alternating layers of separated plates. In one or more embodiments, energy recovery ventilator120may comprise a fixed-plate heat exchanger in a cross-flow configuration. Illustratively, energy recovery ventilator120may comprise a fixed-plate heat exchanger in a counter-flow configuration. In one or more embodiments, energy recovery ventilator120may comprise a fixed-plate heat exchanger having plates manufactured from a water vapor permeable material. Illustratively, energy recovery ventilator120may comprise a fixed-plate heat exchanger having plates manufactured from microporous polymeric membranes. In one or more embodiments, energy recovery ventilator120may comprise a heat pipe heat exchanger, e.g., energy recovery ventilator120may comprise a plurality of tubes wherein each tube comprises an internal capillary wick material. Illustratively, energy recovery ventilator120may comprise a thermosiphon heat exchanger, e.g., energy recovery ventilator120may comprise a plurality of sealed tubes. In one or more embodiments, energy recovery ventilator120may comprise a thermosiphon heat exchanger in a single coil configuration. Illustratively, energy recovery ventilator120may comprise a thermosiphon heat exchanger in a multiple coil configuration. In one or more embodiments, energy recovery ventilator120may comprise a coil energy recovery loop, e.g., energy recovery ventilator120may comprise a runaround loop.

Illustratively, energy recovery ventilator120may be configured to facilitate a heat transfer, e.g., energy recovery ventilator120may be configured facilitate a heat transfer between air streams separated by partition111. In one or more embodiments, energy recovery ventilator120may be configured to facilitate a transfer of thermal energy, e.g., energy recovery ventilator120may be configured to facilitate a transfer of thermal energy by conduction, convection, radiation, advection, etc. Illustratively, energy recovery ventilator120may be configured to facilitate a heat transfer between outside air stream141and return air stream143, e.g., energy recovery ventilator120may be configured to facilitate a transfer of thermal energy from outside air stream141to return air stream143or from return air stream143to outside air stream141. During summer conditions, energy recovery ventilator120may be configured to facilitate a heat transfer between outside air stream141and return air stream143, e.g., energy recovery ventilator120may be configured to facilitate a heat transfer by decreasing a temperature of outside air stream141and increasing a temperature of return air stream143. During winter conditions, energy recovery ventilator120may be configured to facilitate a heat transfer between outside air stream141and return air stream143, e.g., energy recovery ventilator120may be configured to facilitate a heat transfer by increasing a temperature of outside air stream141and decreasing a temperature of return air stream143. In one or more embodiments, energy recovery ventilator120may be configured to facilitate a moisture transfer, e.g., energy recovery ventilator120may be configured to facilitate a moisture transfer between air streams separated by partition111. Illustratively, energy recovery ventilator120may be configured to facilitate a transfer of moisture from outside air stream141to return air stream143or from return air stream143to outside air stream141. During summer conditions, energy recovery ventilator120may be configured to facilitate a moisture transfer between outside air stream141and return air stream143, e.g., energy recovery ventilator120may be configured to facilitate a moisture transfer by decreasing a humidity of outside air stream141and increasing a humidity of return air stream143. During winter conditions, energy recovery ventilator120may be configured to facilitate a moisture transfer between outside air stream141and return air stream143, e.g., energy recovery ventilator120may be configured to facilitate a moisture transfer by increasing a humidity of outside air stream141and decreasing a humidity of return air stream143.

Illustratively, heat recovery ventilator125may be configured to recover sensible energy, e.g., heat recovery ventilator125may be configured for temperature recovery. In one or more embodiments, heat recovery ventilator125may be configured to recover latent energy, e.g., heat recovery ventilator125may be configured for moisture recovery. Illustratively, heat recovery ventilator125may be configured to recover sensible energy and latent energy. In one or more embodiments, heat recovery ventilator125may comprise an enthalpy wheel configured to recover sensible energy and latent energy. Illustratively, heat recovery ventilator125may comprise a sensible only energy recovery wheel configured to recover sensible energy. In one or more embodiments, heat recovery ventilator125may comprise an active desiccant wheel or a passive desiccant wheel.

Illustratively, heat recovery ventilator125may comprise a fixed-plate heat exchanger, e.g., heat recovery ventilator125may comprise alternating layers of separated plates. In one or more embodiments, heat recovery ventilator125may comprise a fixed-plate heat exchanger in a cross-flow configuration. Illustratively, heat recovery ventilator125may comprise a fixed-plate heat exchanger in a counter-flow configuration. In one or more embodiments, heat recovery ventilator125may comprise a fixed-plate heat exchanger having plates manufactured from a water vapor permeable material. Illustratively, heat recovery ventilator125may comprise a fixed-plate heat exchanger having plates manufactured from microporous polymeric membranes. In one or more embodiments, heat recovery ventilator125may comprise a heat pipe heat exchanger, e.g., heat recovery ventilator125may comprise a plurality of tubes wherein each tube comprises an internal capillary wick material. Illustratively, heat recovery ventilator125may comprise a thermosiphon heat exchanger, e.g., heat recovery ventilator125may comprise a plurality of sealed tubes. In one or more embodiments, heat recovery ventilator125may comprise a thermosiphon heat exchanger in a single coil configuration. Illustratively, heat recovery ventilator125may comprise a thermosiphon heat exchanger in a multiple coil configuration. In one or more embodiments, heat recovery ventilator125may comprise a coil energy recovery loop, e.g., heat recovery ventilator125may comprise a runaround loop.

Illustratively, heat recovery ventilator125may be configured to facilitate a heat transfer, e.g., heat recovery ventilator125may be configured facilitate a heat transfer between air streams separated by partition111. In one or more embodiments, heat recovery ventilator125may be configured to facilitate a transfer of thermal energy, e.g., heat recovery ventilator125may be configured to facilitate a transfer of thermal energy by conduction, convection, radiation, advection, etc. Illustratively, heat recovery ventilator125may be configured to facilitate a heat transfer between outside air stream141and return air stream143, e.g., heat recovery ventilator125may be configured to facilitate a transfer of thermal energy from outside air stream141to return air stream143or from return air stream143to outside air stream141. During summer conditions, heat recovery ventilator125may be configured to facilitate a heat transfer between outside air stream141and return air stream143, e.g., heat recovery ventilator125may be configured to facilitate a heat transfer by decreasing a temperature of outside air stream141and increasing a temperature of return air stream143. During winter conditions, heat recovery ventilator125may be configured to facilitate a heat transfer between outside air stream141and return air stream143, e.g., heat recovery ventilator125may be configured to facilitate a heat transfer by increasing a temperature of outside air stream141and decreasing a temperature of return air stream143. In one or more embodiments, heat recovery ventilator125may be configured to facilitate a moisture transfer, e.g., heat recovery ventilator125may be configured to facilitate a moisture transfer between air streams separated by partition111. Illustratively, heat recovery ventilator125may be configured to facilitate a transfer of moisture from outside air stream141to return air stream143or from return air stream143to outside air stream141. During summer conditions, heat recovery ventilator125may be configured to facilitate a moisture transfer between outside air stream141and return air stream143, e.g., heat recovery ventilator125may be configured to facilitate a moisture transfer by decreasing a humidity of outside air stream141and increasing a humidity of return air stream143. During winter conditions, heat recovery ventilator125may be configured to facilitate a moisture transfer between outside air stream141and return air stream143, e.g., heat recovery ventilator125may be configured to facilitate a moisture transfer by increasing a humidity of outside air stream141and decreasing a humidity of return air stream143.

Illustratively, heat recovery ventilator125may be configured to recover sensible energy wherein outside air stream141may ingress fourth supply air zone153at a first temperature and outside air stream141may ingress fifth supply air zone154at a second temperature. In one or more embodiments, the second temperature of outside air stream141may be less than the first temperature of outside air stream141, e.g., the second temperature of outside air stream141may be less than the first temperature of outside air stream141during summer conditions. Illustratively, the second temperature of outside air stream141may be less than the first temperature of outside air stream141during winter conditions. In one or more embodiments, the second temperature of outside air stream141may be greater than the first temperature of outside air stream141, e.g., the second temperature of outside air stream141may be greater than the first temperature of outside air stream141during winter conditions. Illustratively, the second temperature of outside air stream141may be greater than the first temperature of outside air stream141during summer conditions. In one or more embodiments, heat recovery ventilator125may be configured to recover sensible energy wherein return air stream143may ingress first return air zone160at a first temperature and return air stream143may ingress second return air zone161at a second temperature. Illustratively, the second temperature of return air stream143may be less than the first temperature of return air stream143, e.g., the second temperature of return air stream143may be less than the first temperature of return air stream143during winter conditions. In one or more embodiments, the second temperature of return air stream143may be less than the first temperature of return air stream143during summer conditions. Illustratively, the second temperature of return air stream143may be greater than the first temperature of return air stream143, e.g., the second temperature of return air stream143may be greater than the first temperature of return air stream143during summer conditions. In one or more embodiments, the second temperature of return air stream143may be greater than the first temperature of return air stream143during winter conditions.

In one or more embodiments, direct expansion coil110may be disposed in third air supply zone152, e.g., direct expansion coil110may be disposed in second supply air zone151or direct expansion coil110may be disposed in fourth supply air zone153. For example, direct expansion coil110may be disposed in second supply air zone151, third supply air zone152, and fourth supply air zone153. Illustratively, second supply air zone151, third supply air zone152, and fourth supply air zone153may comprise a single supply air zone, e.g., outside air stream141may have a same temperature and moisture content in second supply air zone, third supply air zone152, and fourth supply air zone. In one or more embodiments, partition111may be configured to separate direct expansion coil110from return air stream143, e.g., partition111may be configured to hermetically separate direct expansion coil110from return air stream143. In one or more embodiments, direct expansion coil110may be configured to increase or decrease a temperature of outside air stream141. Illustratively, outside air stream141may ingress second supply air zone151at a first temperature and outside air stream141may ingress fourth supply air zone153at a second temperature. In one or more embodiments, the second temperature of outside air stream141may be less than the first temperature of outside air stream141, e.g., the second temperature of outside air stream141may be less than the first temperature of outside air stream141during summer conditions. Illustratively, the second temperature of outside air stream141may be greater than the first temperature of outside area stream141, e.g., the second temperature of outside air stream141may be greater than the first temperature of outside air stream141during summer conditions.

Illustratively, high efficiency ventilation system in a heat pump configuration100may comprise an air exhauster130and an air supplier135. In one or more embodiments, air exhauster130may comprise a fan or a blower. Illustratively, air exhauster130may be configured to facilitate an exhaust of return air stream143, e.g., air exhauster130may be configured to transfer exhaust air stream144out from fourth return air zone163and into an uncontrolled environment. In one or more embodiments, air supplier135may comprise a fan or a blower. Illustratively, air supplier135may be configured to facilitate a supply of outside air stream141, e.g., air supplier135may be configured to transfer supply air stream142out from sixth supply air zone155and into controlled environment115.

In one or more embodiments, high efficiency ventilation system in a heat pump configuration100may be configured to ventilate a controlled environment115wherein return stream143may ingress first return air zone160at a first temperature and having a first moisture content. Illustratively, heat recovery ventilator125may be configured to increase a temperature of return air stream143or decrease a temperature of return air stream143. In one or more embodiments, high efficiency ventilation system in a heat pump configuration100may be configured to ventilate a controlled environment115wherein outside return stream143may ingress second return air zone161at a second temperature. Illustratively, the second temperature of return air stream143may be greater than the first temperature of return air stream143. In one or more embodiments, the second temperature of return air stream143may be less than the first temperature of return air stream143. Illustratively, the second temperature of return air stream143may be an unchanged temperature from the first temperature of return air stream143. In one or more embodiments, energy recovery ventilator120may be configured to increase a temperature of return air stream143or decrease a temperature of return air stream143. Illustratively, energy recovery ventilator120may be configured to increase a moisture content of return air stream143or decrease a moisture content of return air stream143. In one or more embodiments, high efficiency ventilation system in a heat pump configuration100may be configured to ventilate a controlled environment115wherein return stream143may ingress third return air zone162at a third temperature and having a second moisture content. In one or more embodiments, the third temperature of return air stream143may be greater than the second temperature of return air stream143. Illustratively, the third temperature of return air stream143may be less than the second temperature of return air stream143. In one or more embodiments, the third temperature of return air stream143may be an unchanged temperature from the second temperature of return air stream143. Illustratively, the second moisture content of return air stream143may be greater than the first moisture content of return air stream143. In one or more embodiments, the second moisture content of return air stream143may be less than the first moisture content of return air stream143. Illustratively, the second moisture content of return air stream143may be an unchanged moisture content from the first moisture content of return air stream143. In one or more embodiments, air exhauster130may be configured to exhaust return air stream143to an uncontrolled environment as exhaust air stream144. Illustratively, exhaust air stream144may comprise return air stream143, e.g., exhaust air stream144may comprise return air stream at the third temperature and having the second moisture content.

FIG. 2is a schematic diagram illustrating a high efficiency ventilation system in a heat recovery configuration200. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may comprise a first branch selector unit210, a second branch selector unit220, and a fan coil unit230. Illustratively, first branch selector unit210may be disposed between refrigerant flow controlling condensing unit105and direct expansion coil110. In one or more embodiments, first branch selector unit210may be directly or indirectly connected to direct expansion coil110by liquid line106and gas and suction line107. Illustratively, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to first branch selector unit210. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from first branch selector unit210to refrigerant flow controlling condensing unit105. Illustratively, first branch selector unit210may be directly or indirectly connected to refrigerant flow controlling condensing unit105by a gas and suction line206, a suction line207, and a liquid line208. In one or more embodiments, first branch selector unit210may be connected to gas and suction line206at a gas and suction line junction216, e.g., first branch selector unit210may be connected to gas and suction line junction216by a first branch selector unit gas and suction line211. For example, gas and suction line junction216may comprise a Refnet joint. Illustratively, first branch selector unit210may be connected to suction line207at a suction line junction217, e.g., first branch selector unit210may be connected to suction line junction217by a first branch selector unit suction line212. For example, suction line junction217may comprise a Refnet joint. In one or more embodiments, first branch selector unit210may be connected to liquid line208at a liquid line junction218, e.g., first branch selector unit210may be connected to liquid line junction218by a first branch selector unit liquid line213. For example, liquid line junction218may comprise a Refnet joint. Illustratively, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from first branch selector unit210to direct expansion coil110. In one or more embodiments, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from direct expansion coil110to first branch selector unit210. Illustratively, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to direct expansion coil110. In one or more embodiments, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from direct expansion coil110to refrigerant flow controlling condensing unit105.

Illustratively, second branch selector unit220may be disposed between refrigerant flow controlling condensing unit105and fan coil unit230. In one or more embodiments, second branch selector unit220may be directly or indirectly connected to fan coil unit230by fan coil liquid line226and fan coil gas and suction line227. Illustratively, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to second branch selector unit220. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from second branch selector unit220to refrigerant flow controlling condensing unit105. Illustratively, second branch selector unit220may be directly or indirectly connected to refrigerant flow controlling condensing unit105by gas and suction line206, suction line207, and liquid line208. In one or more embodiments, second branch selector unit220may be connected to gas and suction line206at gas and suction line junction216, e.g., second branch selector unit220may be connected to gas and suction line junction216by a second branch selector unit gas and suction line221. Illustratively, second branch selector unit220may be connected to suction line207at suction line junction217, e.g., second branch selector unit220may be connected to suction line junction217by a second branch selector unit suction line222. In one or more embodiments, second branch selector unit220may be connected to liquid line208at liquid line junction218, e.g., second branch selector unit220may be connected to liquid line junction218by a second branch selector unit liquid line223. Illustratively, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from second branch selector unit220to fan coil unit230. In one or more embodiments, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from fan coil unit230to second branch selector unit220. Illustratively, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to fan coil unit230. In one or more embodiments, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from fan coil unit230to refrigerant flow controlling condensing unit105.

Illustratively, first branch selector unit210and second branch selector unit220may comprise a single branch selector unit, e.g., first branch selector unit210and second branch selector unit220may comprise a multi-port branch selector. In one or more embodiments, first branch selector unit210and second branch selector unit220may comprise independent multi-port branch selectors, e.g., first branch selector unit210may comprise a first multi-port branch selector and second branch selector unit220may comprise a second multi-port branch selector. Illustratively, first branch selector unit210and second branch selector unit220may comprise a single branch circuit controller. In one or more embodiments, first branch selector unit210and second branch selector unit220may comprise independent branch circuit controllers, e.g., first branch selector unit210may comprise a first branch circuit controller and second branch selector unit220may comprise a second branch circuit controller. Illustratively, first branch selector unit210and second branch selector unit220may comprise a single branch selector box. In one or more embodiments, first branch selector unit210and second branch selector unit220may comprise independent branch selector boxes, e.g., first branch selector unit210may comprise a first branch selector box and second branch selector unit220may comprise a second branch selector box.

Illustratively, high efficiency ventilation system in a heat recovery configuration200may be configured to ventilate controlled environment115by supplying air at a controlled temperature and humidity via supply air stream142. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may be configured to ventilate controlled environment115by exhausting air via exhaust air stream144. Illustratively, high efficiency ventilation system in a heat recovery configuration200may be configured to control a temperature of controlled environment115, e.g., fan coil unit230may be configured to increase or decrease a temperature of controlled environment115. During summer conditions, fan coil unit230may be configured to decrease a temperature of controlled environment115. During winter conditions, fan coil unit230may be configured to increase a temperature of controlled environment115. In one or more embodiments, direct expansion coil110may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase a temperature of controlled environment115. Illustratively, direct expansion coil110may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously decrease a temperature of cons trolled environment115. In one or more embodiments, direct expansion coil110may be configured to decrease a temperature of outside air stream141and fan coil unit230may be configured to simultaneously decrease a temperature of controlled environment115. Illustratively, direct expansion coil110may be configured to decrease a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase a temperature of controlled environment115.

In one or more embodiments, refrigerant flow controlling condensing unit105may be directly or indirectly connected to a plurality of fan coil units230, e.g., refrigerant flow controlling condensing unit105may be connected to a plurality of second branch selector units220wherein each second branch selector unit220of the plurality of second branch selector units220may be connected to a fan coil unit230. Illustratively, refrigerant flow controlling condensing unit105may be directly or indirectly connected to a plurality of fan coil units230wherein each fan coil unit230of the plurality of fan coil units230may be configured to increase or decrease a temperature of controlled environment115. For example, a first fan coil unit230may be disposed in a first zone of controlled environment115and a second fan coil unit230may be disposed in a second zone of controlled environment115. In one or more embodiments, the first fan coil unit230may be configured to increase or decrease a temperature of the first zone of controlled environment115. Illustratively, the second fan coil unit230may be configured to increase or decrease a temperature of the second zone of controlled environment115. In one or more embodiments, the first fan coil unit230may be configured to increase a temperature of the first zone of controlled environment115and the second fan coil unit230may be configured to simultaneously increase a temperature of the second zone of controlled environment115. Illustratively, the first fan coil unit230may be configured to increase a temperature of the first zone of controlled environment115and the second fan coil unit230may be configured to simultaneously decrease a temperature of the second zone of controlled environment115. In one or more embodiments, the first fan coil unit230may be configured to decrease a temperature of the first zone of controlled environment115and the second fan coil unit230may be configured to simultaneously decrease a temperature of the second zone of controlled environment115. Illustratively, the first fan coil unit230may be configured to decrease a temperature of the first zone of controlled environment115and the second fan coil unit230may be configured to simultaneously increase a temperature of the second zone of controlled environment115. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may be configured to recover energy from a first fan coil unit230operating in first mode of operation to improve an operating efficiency of a second fan coil unit230operating in a second mode of operation. Illustratively, high efficiency ventilation system in a heat recovery configuration200may be configured to increase an operating efficiency in a range of 10.0 to 150.0 percent, e.g., high efficiency ventilation system in a heat recovery configuration200may be configured to increase an operating efficiency by 98.0 percent. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may be configured to increase an operating efficiency by less than 10.0 percent or greater than 150.0 percent.

Illustratively, high efficiency ventilation system in a heat recovery configuration200may improve an operating efficiency by increasing an Integrated Energy Efficiency Ratio value in a range of 2.0 to 10.0, e.g., high efficiency ventilation system in a heat recovery configuration200may increase an Integrated Energy Efficiency Ratio value by 8.0. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may improve an operating efficiency by increasing an Integrated Energy Efficiency Ratio value by less than 2.0 or by more than 10.0. Illustratively, high efficiency ventilation system in a heat recovery configuration200may improve an operating efficiency by increasing a Coefficient of Performance value in a range of 1.2 to 10.0, e.g., high efficiency ventilation system in a heat recovery configuration200may improve an operating efficiency by increasing a Coefficient of Performance value by 8.0. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may improve an operating efficiency by increasing a Coefficient of Performance by less than 1.2 or by more than 10.0. Illustratively, a first fan coil unit230may be operating in a cooling mode, e.g., the first fan coil unit230may be configured to decrease a temperature of a first zone of controlled environment115by removing heat from the first zone of controlled environment115. In one or more embodiments, a second fan coil unit230may be operating in a heating mode, e.g., the second fan coil unit230may be configured to increase a temperature of a second zone of controlled environment115by supplying heat to the second zone of controlled environment115. Illustratively, high efficiency ventilation system in a heat recovery configuration200may be configured to recover energy by transferring heat removed from the first zone of controlled environment115to the second zone of controlled environment115, e.g., high efficiency ventilation system in a heat recovery configuration200may be configured to supply heat removed from the first zone of controlled environment115to the second zone of controlled environment115. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may be configured to recover energy from a first fan coil unit230operating in first mode of operation to improve an operating efficiency of a plurality of fan coil units230operating in a second mode of operation. Illustratively, a first fan coil unit230may be operating in a cooling mode, e.g., the first fan coil unit230may be configured to decrease a temperature of a first zone of controlled environment115by removing heat from the first zone of controlled environment115. In one or more embodiments, a plurality of fan coil units230may be operating in a heating mode, e.g., a plurality of fan coil units230may be configured to increase a temperature of a plurality of zones of controlled environment115by supplying heat to the plurality of zones of controlled environment115. Illustratively, high efficiency ventilation system in a heat recovery configuration200may be configured to recover energy by transferring heat removed from the first zone of controlled environment115to the plurality of zones of controlled environment115, e.g., high efficiency ventilation system in a heat recovery configuration200may be configured to supply heat removed from the first zone of controlled environment115to the plurality of zones of controlled environment115. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may be configured to uniformly transfer heat removed from the first zone of controlled environment115to the plurality of zones of controlled environment115, e.g., heat removed from the first zone of controlled environment115may be distributed wherein each zone of the plurality of zones of controlled environment115receives an equal amount of heat removed from the first zone of controlled environment115. Illustratively, high efficiency ventilation system in a heat recovery configuration200may be configured to selectively transfer heat removed from the first zone of controlled environment115to the plurality of zones of controlled environment115, e.g., heat removed from the first zone of controlled environment115may be distributed to the plurality of zones of controlled environment115in accordance with one or more distribution variables. In one or more embodiments, distribution variables may comprise information about a particular zone of the plurality of zones of controlled environment115, e.g., distribution variables may comprise a temperature of the particular zone of the plurality of zones of controlled environment115. Illustratively, distribution variables may comprise information about a particular fan coil unit230of a plurality of fan coil units230, e.g., distribution variables may comprise a temperature control efficiency of the particular fan coil unit230of the plurality of fan coil units230.

In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may be configured to recover energy from fan coil unit230to improve an operating efficiency of direct expansion coil110. Illustratively, high efficiency ventilation system in a heat recovery configuration200may be configured to recover energy from direct expansion coil110to improve an operating efficiency of fan coil unit230. In one or more embodiments, a first fan coil unit230may be operating in a cooling mode, e.g., the first fan coil unit230may be configured to decrease a temperature of a first zone of controlled environment115by removing heat from the first zone of controlled environment115. Illustratively, direct expansion coil110may be operating in a heating mode, e.g., direct expansion coil110may be configured to increase a temperature of outside air stream141by supplying heat to outside air stream141. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may be configured to recover energy by transferring heat removed from the first zone of controlled environment115to outside air stream141, e.g., high efficiency ventilation system in a heat recovery configuration200may be configured to supply heat removed from the first zone of controlled environment115to outside air stream141. Illustratively, direct expansion coil110may be operating in a cooling mode, e.g., direct expansion coil110may be configured to decrease a temperature of outside air stream141by removing heat from outside air stream141. In one or more embodiments, a first fan coil unit230may be operating in a heating mode, e.g., the first fan coil unit230may be configured to increase a temperature of a first zone of controlled environment115by supplying heat to the first zone of controlled environment115. Illustratively, high efficiency ventilation system in a heat recovery configuration200may be configured to recover energy by transferring heat removed from the outside air stream141to the first zone of controlled environment115, e.g., high efficiency ventilation system in a heat recovery configuration200may be configured to supply heat removed from outside air stream141to the first zone of controlled environment115.

In one or more embodiments, direct expansion coil110may be operating in a cooling mode, e.g., direct expansion coil110may be configured to decrease a temperature of outside air stream141by removing heat from outside air stream141. Illustratively, a plurality of fan coil units230may be operating in a heating mode, e.g., a plurality of fan coil units230may be configured to increase a temperature of a plurality of zones of controlled environment115by supplying heat to the plurality of zones of controlled environment115. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may be configured to recover energy by transferring heat removed from outside air stream141to the plurality of zones of controlled environment115, e.g., high efficiency ventilation system in a heat recovery configuration200may be configured to supply heat removed from outside air stream141to the plurality of zones of controlled environment115. Illustratively, high efficiency ventilation system in a heat recovery configuration200may be configured to uniformly transfer heat removed from outside air stream141to the plurality of zones of controlled environment115, e.g., heat removed from outside air stream141may be distributed wherein each zone of the plurality of zones of controlled environment115receives an equal amount of heat removed from outside air stream141. In one or more embodiments, high efficiency ventilation system in a heat recovery configuration200may be configured to selectively transfer heat removed from outside air stream141to the plurality of zones of controlled environment115, e.g., heat removed from outside air stream141may be distributed to the plurality of zones of controlled environment115in accordance with one or more distribution variables. Illustratively, distribution variables may comprise information about a particular zone of the plurality of zones of controlled environment115, e.g., distribution variables may comprise a temperature of the particular zone of the plurality of zones of controlled environment115. In one or more embodiments, distribution variables may comprise information about a particular fan coil unit230of a plurality of fan coil units230, e.g., distribution variables may comprise a temperature control efficiency of the particular fan coil unit230of the plurality of fan coil units230.

FIG. 3is a schematic diagram illustrating a high efficiency ventilation system with an auxiliary coil in outside air stream300. Illustratively, high efficiency ventilation system with an auxiliary coil in outside air stream300may comprise a refrigerant flow controlling condensing unit105, a first branch selector unit210, a second branch selector unit220, a third branch selector unit330, a direct expansion coil110, a fan coil unit230, a bypass mechanism305, and an auxiliary direct expansion coil310. In one or more embodiments, first branch selector unit210may be disposed between direct expansion coil110and refrigerant flow controlling condensing unit105. Illustratively, first branch selector unit210may be directly or indirectly connected to direct expansion coil110by liquid line106and gas and suction line107. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to first branch selector unit210. Illustratively, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from first branch selector unit210to refrigerant flow controlling condensing unit105. In one or more embodiments, first branch selector unit210may be directly or indirectly connected to refrigerant flow controlling condensing unit105by a gas and suction line206, a suction line207, and a liquid line208. Illustratively, first branch selector unit210may be connected to gas and suction line206at a gas and suction line junction216, e.g., first branch selector unit210may be connected to gas and suction line junction216by a first branch selector unit gas and suction line211. In one or more embodiments, first branch selector unit210may be connected to suction line207at a suction line junction217, e.g., first branch selector unit210may be connected to suction line junction217by a first branch selector unit suction line212. Illustratively, first branch selector unit210may be connected to liquid line208at a liquid line junction218, e.g., first branch selector unit210may be connected to liquid line junction218by a first branch selector unit liquid line213. In one or more embodiments, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from first branch selector unit210to direct expansion coil110. Illustratively, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from direct expansion coil110to first branch selector unit210. In one or more embodiments, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to direct expansion coil110. Illustratively, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from direct expansion coil110to refrigerant flow controlling condensing unit105.

In one or more embodiments, second branch selector unit220may be disposed between refrigerant flow controlling condensing unit105and fan coil unit230. Illustratively, second branch selector unit220may be directly or indirectly connected to fan coil unit230by fan coil liquid line226and fan coil gas and suction line227. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to second branch selector unit220. Illustratively, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from second branch selector unit220to refrigerant flow controlling condensing unit105. In one or more embodiments, second branch selector unit220may be directly or indirectly connected to refrigerant flow controlling condensing unit105by gas and suction line206, suction line207, and liquid line208. Illustratively, second branch selector unit220may be connected to gas and suction line206at gas and suction line junction316, e.g., second branch selector unit220may be connected to gas and suction line junction316by a second branch selector unit gas and suction line221. For example, gas and suction line junction316may comprise a Refnet joint. In one or more embodiments, second branch selector unit220may be connected to suction line207at suction line junction317, e.g., second branch selector unit220may be connected to suction line junction317by a second branch selector unit suction line222. For example, suction line junction317may comprise a Refnet joint. Illustratively, second branch selector unit220may be connected to liquid line208at liquid line junction318, e.g., second branch selector unit220may be connected to liquid line junction318by a second branch selector unit liquid line223. For example, liquid line junction318may comprise a Refnet joint. In one or more embodiments, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from second branch selector unit220to fan coil unit230. Illustratively, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from fan coil unit230to second branch selector unit220. In one or more embodiments, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to fan coil unit230. Illustratively, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from fan coil unit230to refrigerant flow controlling condensing unit105.

In one or more embodiments, third branch selector unit330may be disposed between auxiliary direct expansion coil310and refrigerant flow controlling condensing unit105. Illustratively, third branch selector unit330may be directly or indirectly connected to auxiliary direct expansion coil310by liquid line306and gas and suction line307. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to third branch selector unit330. Illustratively, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from third branch selector unit330to refrigerant flow controlling condensing unit105. In one or more embodiments, third branch selector unit330may be directly or indirectly connected to refrigerant flow controlling condensing unit105by a gas and suction line206, a suction line207, and a liquid line208. Illustratively, third branch selector unit330may be connected to gas and suction line206at a gas line junction, e.g., third branch selector unit330may be connected to a gas line junction by a third branch selector unit gas and suction line331. In one or more embodiments, third branch selector unit330may be connected to suction line207at a suction line junction, e.g., third branch selector unit330may be connected to a suction line junction by a third branch selector unit suction line332. Illustratively, third branch selector unit330may be connected to liquid line208at a liquid line junction, e.g., third branch selector unit330may be connected to a liquid line junction330by a third branch selector unit liquid line333. In one or more embodiments, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from third branch selector unit330to auxiliary direct expansion coil310. Illustratively, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from auxiliary direct expansion coil310to third branch selector unit330. In one or more embodiments, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to auxiliary direct expansion coil310. Illustratively, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from auxiliary direct expansion coil310to refrigerant flow controlling condensing unit105.

Illustratively, first branch selector unit210, second branch selector unit220, and third branch selector unit330may comprise a single branch selector unit, e.g., first branch selector unit210, second branch selector unit220, and third branch selector unit330may comprise a multi-port branch selector. In one or more embodiments, first branch selector unit210, second branch selector unit220, and third branch selector unit330may comprise independent multi-port branch selectors, e.g., first branch selector unit210may comprise a first multi-port branch selector, second branch selector unit220may comprise a second multi-port branch selector, and third branch selector unit330may comprise a third multi-port branch selector. Illustratively, first branch selector unit210, second branch selector unit220, and third branch selector unit330may comprise a single branch circuit controller. In one or more embodiments, first branch selector unit210, second branch selector unit220, and third branch selector unit330may comprise independent branch circuit controllers, e.g., first branch selector unit210may comprise a first branch circuit controller, second branch selector unit220may comprise a second branch circuit controller, and third branch selector unit330may comprise a third branch circuit controller. Illustratively, first branch selector unit210, second branch selector unit220, and third branch selector unit330may comprise a single branch selector box. In one or more embodiments, first branch selector unit210, second branch selector unit220, and third branch selector unit330may comprise independent branch selector boxes, e.g., first branch selector unit210may comprise a first branch selector box, second branch selector unit220may comprise a second branch selector box, and third branch selector unit330may comprise a third branch selector box.

Illustratively, high efficiency ventilation system with an auxiliary coil in outside air stream300may be configured to ventilate controlled environment115by supplying air at a controlled temperature and humidity via supply air stream142. In one or more embodiments, high efficiency ventilation system with an auxiliary coil in outside air stream300may be configured to ventilate controlled environment115by exhausting air via exhaust air stream144. Illustratively, high efficiency ventilation system with an auxiliary coil in outside air stream300may be configured to control a temperature of controlled environment115, e.g., fan coil unit230may be configured to increase or decrease a temperature of controlled environment115. During summer conditions, fan coil unit230may be configured to decrease a temperature of controlled environment115. During winter conditions, fan coil unit230may be configured to increase a temperature of controlled environment115. In one or more embodiments, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase a temperature of controlled environment115. Illustratively, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously decrease a temperature of controlled environment115. In one or more embodiments, direct expansion coil110may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously decrease a temperature of controlled environment115. Illustratively, direct expansion coil110may be configured to decrease a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase a temperature of controlled environment115. In one or more embodiments, high efficiency ventilation system with an auxiliary coil in outside air stream300may comprise a high efficiency ventilation system in a heat recovery configuration200. Illustratively, high efficiency ventilation system with an auxiliary coil in outside air stream300may be configured to recover energy from a first fan coil unit230operating in a first mode of operation to improve an operating efficiency of a second fan coil unit230operating in a second mode of operation. In one or more embodiments, high efficiency ventilation system with an auxiliary coil in outside air stream300may be configured to recover energy from one or more fan coil units230to improve an operating efficiency of direct expansion coil110or auxiliary direct expansion coil310. Illustratively, high efficiency ventilation system with an auxiliary coil in outside air stream300may be configured to recover energy from direct expansion coil110or auxiliary direct expansion coil310to improve an operating efficiency of one or more fan coil units230.

In one or more embodiments, auxiliary direct expansion coil310may be disposed within an eighth supply air zone351, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in eighth supply air zone351. Illustratively, auxiliary direct expansion coil310may be configured to increase or decrease a temperature of outside air stream141. In one or more embodiments, auxiliary direct expansion coil310may comprise a heating-only direct expansion coil110, e.g., auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141. Illustratively, auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141during a performance of a maintenance operation on refrigerant flow controlling condensing unit105. In one or more embodiments, a performance of a maintenance operation on refrigerant flow controlling condensing unit105may temporarily reduce a heating capacity of direct expansion coil110, e.g., a performance of a maintenance operation on refrigerant flow controlling condensing unit105may temporarily reduce a heating capacity of direct expansion coil110by 50.0 percent. Illustratively, auxiliary direct expansion coil310may be configured to provide heating capacity to supplement a reduced heating capacity of direct expansion coil110, e.g., auxiliary direct expansion coil310may be configured to provide heating capacity to supplement a reduced heating capacity of direct expansion coil110during a performance of a maintenance operation on refrigerant flow controlling condensing unit105. In one or more embodiments, direct expansion coil110may be configured to increase a temperature of outside air stream141, e.g., outside air stream141may ingress second supply air zone151at a first temperature. Illustratively, direct expansion coil110may be configured to increase a temperature of air in third supply air zone152, e.g., outside air stream141may ingress fourth supply air zone153at a second temperature. In one or more embodiments, the second temperature of outside air stream141may be greater than the first temperature of outside air stream141. Illustratively, heat recovery ventilator125may be configured to increase a temperature of outside air stream141, e.g., outside air stream141may ingress seventh supply air zone350at a third temperature wherein the third temperature of outside air stream141is greater than the second temperature of outside air stream141. In one or more embodiments, auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141, e.g., outs side air stream141may ingress sixth supply air zone155at a fourth temperature wherein the fourth temperature of outside air stream141is greater than the third temperature of outside air stream141. Illustratively, heat recovery ventilator125may be in a standby mode, e.g., heat recovery ventilator125may be configured not to increase or decrease a temperature of outside air stream141. In one or more embodiments, direct expansion coil110may be configured to increase a temperature of outside air stream141, e.g., outside air stream141may ingress second supply air zone151at a first temperature and outside air stream141may ingress fourth supply air zone153at a second temperature wherein the second temperature of outside air stream141may be greater than the first temperature of outside air stream141. Illustratively, outside air stream141may ingress seventh supply air zone350at the second temperature, e.g., outside air stream141may ingress seventh supply air zone350at the second temperature when heat recovery ventilator125is in a standby mode.

In one or more embodiments, auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141, e.g., outside air stream141may ingress sixth supply air zone155at a third temperature wherein the third temperature of outside air stream141is greater than the second temperature of outside air stream141. Illustratively, auxiliary direct expansion coil310may be configured to provide heating capacity during a defrost operation, e.g., auxiliary direct expansion coil310may be configured to provide heating capacity during a defrost operation to defrost direct expansion coil110. In one or more embodiments, auxiliary direct expansion coil310may be configured to provide heating capacity during a defrost operation to defrost energy recovery ventilator120. Illustratively, auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141during a defrost operation to defrost direct expansion coil110. In one or more embodiments, auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141during a defrost operation to defrost energy recovery ventilator120. Illustratively, auxiliary direct expansion coil310may be configured to increase a temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to increase a temperature of return air stream143during a defrost operation. In one or more embodiments, bypass mechanism305may be configured to mechanically control air flow within high efficiency ventilation system with an auxiliary coil in outside air stream300. Illustratively, bypass mechanism305may be configured to direct air flow out from one or more supply air zones and into one or more return air zones. In one or more embodiments, bypass mechanism305may be configured to direct air flow out from one or more return air zones and into one or more supply air zones. Illustratively, bypass mechanism305may be configured to direct return air stream143out from a fifth return air zone360and into seventh supply air zone350, e.g., bypass mechanism305may be configured to prevent an ingress of return air stream143into second return air zone161. In one or more embodiments, bypass mechanism305may be configured to facilitate an ingress of return air stream143into seventh supply air zone350. Illustratively, bypass mechanism305may be configured to facilitate an ingress of return air stream143into fourth supply air zone153, e.g., bypass mechanism305may be configured to facilitate an ingress of return air stream143into fourth supply air zone153during a defrost operation to defrost direct expansion coil110. In one or more embodiments, bypass mechanism305may be configured to facilitate an ingress of return air stream143into third supply air zone152, e.g., bypass mechanism305may be configured to facilitate an ingress of return air stream143into third supply air zone152during a defrost operation to defrost direct expansion coil110. Illustratively, air supplier135may be configured to facilitate an ingress of return air stream143into third supply air zone152during a defrost operation to defrost direct expansion coil110, e.g., air supplier135may be temporarily reversed to facilitate an ingress of return air stream143into third supply air zone152.

In one or more embodiments, auxiliary direct expansion coil310may be configured to increase a temperature of return air stream143during a defrost operation to defrost direct expansion coil110, e.g., auxiliary direct expansion coil310may be configured to increase a temperature of seventh supply air zone350. Illustratively, return air stream143may ingress fifth return air zone360at a first temperature, e.g., the first temperature may be greater than a temperature of air within third supply air zone152. In one or more embodiments, bypass mechanism305may be configured to direct return air stream143out from fifth return air zone360and into seventh supply air zone350. Illustratively, return air stream143may ingress seventh supply air zone350at the first temperature. In one or more embodiments, auxiliary direct expansion coil310may be cons figured to increase a temperature of return air stream143in seventh supply air zone350. Illustratively, return air stream143may egress seventh supply air zone350at a second temperature wherein the second temperature of return air stream143is greater than the first temperature of return air stream143. In one or more embodiments, return air stream143may ingress fourth supply air zone153at the second temperature, e.g., return air stream143may ingress fourth supply air zone153at the second temperature during a defrost operation to defrost direct expansion coil110.

In one or more embodiments, auxiliary direct expansion coil310may be configured to increase a temperature of return air stream143during a defrost operation to defrost energy recovery ventilator120, e.g., auxiliary direct expansion coil310may be configured to increase a temperature of seventh supply air zone350. Illustratively, return air stream143may ingress fifth return air zone360at a first temperature, e.g., the first temperature may be greater than a temperature of outside air stream141. In one or more embodiments, bypass mechanism305may be configured to direct return air stream143out from fifth return air zone360and into seventh supply air zone350. Illustratively, return air stream143may ingress seventh supply air zone350at the first temperature. In one or more embodiments, auxiliary direct expansion coil310may be configured to increase a temperature of return air stream143in seventh supply air zone350. Illustratively, return air stream143may egress seventh supply air zone350at a second temperature wherein the second temperature of return air stream143is greater than the first temperature of return air stream143. In one or more embodiments, return air stream143may ingress fourth supply air zone153at the second temperature. Illustratively, direct expansion coil110may be configured to increase a temperature of return air stream143. In one or more embodiments, return air stream143may ingress second supply air zone151at a third temperature wherein the third temperature of return air stream143is greater than the second temperature of return air stream143. Illustratively, return air stream143may ingress second supply air zone151at the third temperature during a defrost operation to defrost energy recovery ventilator120.

Illustratively, bypass mechanism305may be configured to direct outside air stream141out from seventh supply air zone350and into fifth return air zone360, e.g., bypass mechanism305may be configured to facilitate an ingress of outside air stream141into fifth return air zone360during a defrost operation to defrost energy recovery ventilator120. In one or more embodiments, outside air stream141may ingress seventh supply air zone350at a first temperature. Illustratively, auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141. In one or more embodiments, outside air stream141may egress seventh supply air zone350at a second temperature wherein the second temperature of outside air stream141is greater than the first temperature of outside air stream141. Illustratively, outside air stream141may ingress fifth return air zone360at the second temperature. In one or more embodiments, outside air stream141may ingress second return air zone161at the second temperature during a defrost operation to defrost energy recovery ventilator120. Illustratively, high efficiency ventilation system with an auxiliary coil in outside air stream300may be configured to simultaneously defrost energy recovery ventilator on both sides of partition111, e.g., direct expansion coil110may be configured to defrost energy recovery ventilator120in second supply air zone151and auxiliary direct expansion coil310may be configured to defrost energy recovery ventilator120in second return air zone161.

In one or more embodiments, high efficiency ventilation system with an auxiliary coil in outside air stream300may be configured to decrease a temperature of outside air stream141to improve cooling efficiency. Illustratively, high efficiency ventilation system with an auxiliary coil in outside air stream300may be configured to decrease a temperature of return air stream143to improve cooling efficiency. In one or more embodiments, outside air stream141may ingress second supply air zone151at a first temperature. Illustratively, direct expansion coil110may be configured to decrease a temperature of outside air stream141, e.g., outside air stream141may ingress fourth supply air zone153at a second temperature wherein the second temperature of outside air stream141is less than the first temperature of outside air stream141. In one or more embodiments, outside air stream141may ingress seventh supply air zone350at the second temperature. Illustratively, auxiliary direct expansion coil310may be configured to decrease a temperature of outside air stream141, e.g., outside air stream141my ingress sixth supply air zone155at a third temperature wherein the third temperature of outside air stream141is less than the second temperature of outside air stream141.

In one or more embodiments, auxiliary direct expansion coil310may be configured to decrease a temperature of return air stream143to decrease a temperature of outside air stream141in second supply air zone151. Illustratively, energy recovery ventilator120may be configured to improve cooling efficiency of high efficiency ventilation system with an auxiliary coil in outside air stream300by removing heat from outside air stream141. In one or more embodiments, energy recovery ventilator120may be configured to transfer heat from outside air stream141to return air stream143. Illustratively, auxiliary direct expansion coil310may be configured to decrease a temperature of return air stream143to increase an amount of heat that energy recovery ventilator120is configured to remove from outside air stream141. In one or more embodiments, return air stream143may ingress first return air zone160at a first temperature wherein the first temperature is lower than a temperature of outside air stream141. Illustratively, auxiliary direct expansion coil310may be configured to decrease a temperature of return air stream143, e.g., bypass mechanism305may be configured to facilitate a decrease in a temperature of fifth return air zone360. In one or more embodiments, auxiliary direct expansion coil310may be configured to decrease a temperature of return air stream143, e.g., return air stream143may ingress second return air zone161at a second temperature wherein the second temperature of return air stream143is less than the first temperature of return air stream143. Illustratively, energy recovery ventilator120may be configured to transfer more heat from outside air stream141to a return air stream143at the second temperature than a return air stream143at the first temperature. In one or more embodiments, outside air stream141may ingress second supply air zone151at a lower temperature if return air stream143ingresses second return air zone161at the second temperature than if return air stream143ingresses second return air zone161at the first temperature.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in first supply air zone150, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in first supply air zone150. Illustratively, outside air stream141may ingress first supply air zone150at a first temperature and outside air stream141may egress first supply air zone150at a second temperature, e.g., outside air stream141may ingress second supply air zone151at the second temperature. In one or more embodiments, the second temperature of outside air stream141may be greater than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within first supply air zone150. Illustratively, the second temperature of outside air stream141may be less than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within first supply air zone150.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in second supply air zone151, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in second supply air zone151. Illustratively, outside air stream141may ingress second supply air zone151at a first temperature and outside air stream141may egress second supply air zone151at a second temperature, e.g., outside air stream141may ingress third supply air zone152at the second temperature. In one or more embodiments, the second temperature of outside air stream141may be greater than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within second supply air zone151. Illustratively, the second temperature of outside air stream141may be less than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within second supply air zone151.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in fourth supply air zone153, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in fourth supply air zone153. Illustratively, outside air stream141may ingress fourth supply air zone153at a first temperature and outside air stream141may egress fourth supply air zone153at a second temperature, e.g., outside air stream141may ingress seventh supply air zone350at the second temperature. In one or more embodiments, the second temperature of outside air stream141may be greater than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within fourth supply air zone153. Illustratively, the second temperature of outside air stream141may be less than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within fourth supply air zone153.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in seventh supply air zone350, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in seventh supply air zone350. Illustratively, outside air stream141may ingress seventh supply air zone350at a first temperature and outside air stream141may egress seventh supply air zone350at a second temperature, e.g., outside air stream141may ingress eighth supply air zone351at the second temperature. In one or more embodiments, the second temperature of outside air stream141may be greater than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within seventh supply air zone350. Illustratively, the second temperature of outside air stream141may be less than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within seventh supply air zone350.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in sixth supply air zone155, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in sixth supply air zone155. Illustratively, outside air stream141may ingress sixth supply air zone155at a first temperature and outside air stream141may egress sixth supply air zone155at a second temperature, e.g., outside air stream141may ingress controlled environment115at the second temperature as supply air stream142. In one or more embodiments, the second temperature of outside air stream141may be greater than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within sixth supply air zone155. Illustratively, the second temperature of outside air stream141may be less than the first temperature of outside air stream141, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within sixth supply air zone155.

In one or more embodiments, high efficiency ventilation system with an auxiliary coil in outside air stream300may comprise a high efficiency ventilation system in a heat pump configuration100. Illustratively, direct expansion coil110may be directly or indirectly connected to a first refrigerant flow controlling condensing unit105, e.g., direct expansion coil110and a first refrigerant flow controlling condensing unit105be configured to operate in a heat pump configuration or a heat recovery configuration. In one or more embodiments, auxiliary direct expansion coil310may be directly or indirectly connected to a second refrigerant flow controlling condensing unit105, e.g., auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to operate in a heat pump configuration or a heat recovery configuration. Illustratively, direct expansion coil110and a first refrigerant flow controlling condensing unit105may be configured to operate in a heat pump configuration and auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to simultaneously operate in a heat pump configuration. In one or more embodiments, direct expansion coil110and a first refrigerant flow controlling condensing unit105may be configured to operate in a heat recovery configuration and auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to simultaneously operate in a heat recovery configuration. Illustratively, direct expansion coil110and a first refrigerant flow controlling condensing unit105may be configured to operate in a heat recovery configuration and auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to simultaneously operate in a heat pump configuration. In one or more embodiments, direct expansion coil110and a first refrigerant flow controlling condensing unit105may be configured to operate in a heat pump configuration and auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to simultaneously operate in a heat recovery configuration.

FIG. 4is a schematic diagram illustrating a high efficiency ventilation system with an auxiliary coil in return air stream400. In one or more embodiments, high efficiency ventilation system with an auxiliary coil in return air stream400may comprise may comprise a refrigerant flow controlling condensing unit105, a first branch selector unit210, a second branch selector unit220, a third branch selector unit330, a direct expansion coil110, a fan coil unit230, a bypass mechanism405, and an auxiliary direct expansion coil310. Illustratively, high efficiency ventilation system with an auxiliary coil in return air stream400may be configured to ventilate controlled environment115by supplying air at a controlled temperature and humidity via supply air stream142. In one or more embodiments, high efficiency ventilation system with an auxiliary coil in return air stream400may be configured to ventilate controlled environment115by exhausting air via exhaust air stream144. Illustratively, high efficiency ventilation system with an auxiliary coil in return air stream400may be configured to control a temperature of controlled environment115, e.g., fan coil unit230may be configured to increase or decrease a temperature of controlled environment115. During summer conditions, fan coil unit230may be configured to decrease a temperature of controlled environment115. During winter conditions, fan coil unit230may be configured to increase a temperature of controlled environment115. In one or more embodiments, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase a temperature of controlled environment115. Illustratively, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously decrease a temperature of controlled environment115. In one or more embodiments, direct expansion coil110may be configured to decrease a temperature of outside air stream141and fan coil unit230may be configured to simultaneously decrease a temperature of controlled environment115. Illustratively, direct expansion coil110may be configured to decrease a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase a temperature of controlled environment115. In one or more embodiments, high efficiency ventilation system with an auxiliary coil in return air stream400may comprise a high efficiency ventilation system in a heat recovery configuration200. Illustratively, high efficiency ventilation system with an auxiliary coil in return air stream400may be configured to recover energy from a first fan coil unit230operating in a first mode of operation to improve an operating efficiency of a second fan coil unit230operating in a second mode of operation. In one or more embodiments, high efficiency ventilation system with an auxiliary coil in return air stream400may be configured to recover energy from one or more fan coil units230to improve an operating efficiency of direct expansion coil110or auxiliary direct expansion coil310. Illustratively, high efficiency ventilation system with an auxiliary coil in return air stream400may be configured to recover energy from direct expansion coil110or auxiliary direct expansion coil310to improve an operating efficiency of one or more fan coil units230.

In one or more embodiments, auxiliary direct expansion coil310may be configured to increase a temperature of return air stream143during a defrost operation to defrost energy recovery ventilator120. Illustratively, return air stream143may ingress first return air zone160at a first temperature. In one or more embodiments, auxiliary direct expansion coil310may be configured to increase a temperature of air in sixth return air zone460. Illustratively, return air stream143may ingress seventh return air zone461at a second temperature wherein the second temperature of return air stream143is greater than the first temperature of return air stream143. In one or more embodiments, return air stream143may ingress second return air zone161at the second temperature, e.g., return air stream143may ingress second return air zone161at the second temperature during a defrost operation to defrost energy recovery ventilator120. Illustratively, direct expansion coil110may be configured to simultaneously defrost energy recovery ventilator120during a defrost operation to defrost energy recovery ventilator120.

In one or more embodiments, auxiliary direct expansion coil310may be configured to decrease a temperature of return air stream143to decrease a temperature of outside air stream141in second supply air zone151. Illustratively, energy recovery ventilator120may be configured to improve cooling efficiency of high efficiency ventilation system with an auxiliary coil in return air stream400by removing heat from outside air stream141. In one or more embodiments, energy recovery ventilator120may be configured to transfer heat from outside air stream141to return air stream143. Illustratively, auxiliary direct expansion coil310may be configured to decrease a temperature of return air stream143to increase an amount of heat that energy recovery ventilator120is configured to remove from outside air stream141. In one or more embodiments, return air stream143may ingress first return air zone160at a first temperature wherein the first temperature is lower than a temperature of outside air stream141. Illustratively, auxiliary direct expansion coil310may be configured to decrease a temperature of return air stream143. In one or more embodiments, auxiliary direct expansion coil310may be configured to decrease a temperature of return air stream143, e.g., return air stream143may ingress second return air zone161at a second temperature wherein the second temperature of return air stream143is less than the first temperature of return air stream143. Illustratively, energy recovery ventilator120may be configured to transfer more heat from outside air stream141to a return air stream143at the second temperature than a return air stream143at the first temperature. In one or more embodiments, outside air stream141may ingress second supply air zone151at a lower temperature if return air stream143ingresses second return air zone161at the second temperature than if return air stream143ingresses second return air zone161at the first temperature.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in first return air zone160, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in first return air zone160. Illustratively, return air stream143may ingress first return air zone160at a first temperature and return air stream143may egress first return air zone160at a second temperature, e.g., return air stream143may ingress sixth return air zone460at the second temperature. In one or more embodiments, the second temperature of return air stream143may be greater than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within first return air zone160. Illustratively, the second temperature of return air stream143may be less than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within first return air zone160.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in seventh return air zone461, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in seventh return air zone461. Illustratively, return air stream143may ingress seventh return air zone461at a first temperature and return air stream143may egress seventh return air zone461at a second temperature, e.g., return air stream143may ingress second return air zone161at the second temperature. In one or more embodiments, the second temperature of return air stream143may be greater than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within seventh return air zone461. Illustratively, the second temperature of return air stream143may be less than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within seventh return air zone461.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in second return air zone161, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in second return air zone161. Illustratively, return air stream143may ingress second return air zone161at a first temperature and return air stream143may egress second return air zone161at a second temperature, e.g., return air stream143may ingress third return air zone162at the second temperature. In one or more embodiments, the second temperature of return air stream143may be greater than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within second return air zone161. Illustratively, the second temperature of return air stream143may be less than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within second return air zone161.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in third return air zone162, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in third return air zone162. Illustratively, return air stream143may ingress third return air zone162at a first temperature and return air stream143may egress third return air zone162at a second temperature, e.g., return air stream143may ingress fourth return air zone163at the second temperature. In one or more embodiments, the second temperature of return air stream143may be greater than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within third return air zone162. Illustratively, the second temperature of return air stream143may be less than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within third return air zone162.

In one or more embodiments, auxiliary direct expansion coil310may be disposed in fourth return air zone163, e.g., auxiliary direct expansion coil310may be configured to increase or decrease a temperature of air in fourth return air zone163. Illustratively, return air stream143may ingress fourth return air zone163at a first temperature and return air stream143may egress fourth return air zone163at a second temperature, e.g., return air stream143may egress fourth return air zone163at the second temperature as exhaust air stream144. In one or more embodiments, the second temperature of return air stream143may be greater than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a heating mode within fourth return air zone163. Illustratively, the second temperature of return air stream143may be less than the first temperature of return air stream143, e.g., auxiliary direct expansion coil310may be configured to operate in a cooling mode within fourth return air zone163.

In one or more embodiments, high efficiency ventilation system with an auxiliary coil in return air stream400may comprise a high efficiency ventilation system in a heat pump configuration100. Illustratively, direct expansion coil110may be directly or indirectly connected to a first refrigerant flow controlling condensing unit105, e.g., direct expansion coil110and a first refrigerant flow controlling condensing unit105be configured to operate in a heat pump configuration or a heat recovery configuration. In one or more embodiments, auxiliary direct expansion coil310may be directly or indirectly connected to a second refrigerant flow controlling condensing unit105, e.g., auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to operate in a heat pump configuration or a heat recovery configuration. Illustratively, direct expansion coil110and a first refrigerant flow controlling condensing unit105may be configured to operate in a heat pump configuration and auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to simultaneously operate in a heat pump configuration. In one or more embodiments, direct expansion coil110and a first refrigerant flow controlling condensing unit105may be configured to operate in a heat recovery configuration and auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to simultaneously operate in a heat recovery configuration. Illustratively, direct expansion coil110and a first refrigerant flow controlling condensing unit105may be configured to operate in a heat recovery configuration and auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to simultaneously operate in a heat pump configuration. In one or more embodiments, direct expansion coil110and a first refrigerant flow controlling condensing unit105may be configured to operate in a heat pump configuration and auxiliary direct expansion coil310and a second refrigerant flow controlling condensing unit105may be configured to simultaneously operate in a heat recovery configuration.

FIG. 5is a schematic diagram illustrating a high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may comprise a refrigerant flow controlling condensing unit105, an auxiliary refrigerant flow controlling condensing unit505, a direct expansion coil110, an auxiliary direct expansion coil310, a bypass mechanism305, a first branch selector unit210, a second branch selector unit220, a third branch selector unit330, a fourth branch selector unit520, a fan coil unit230, and an auxiliary fan coil unit530. Illustratively, first branch selector unit210may be disposed between refrigerant flow controlling condensing unit105and direct expansion coil110. In one or more embodiments, first branch selector unit210may be directly or indirectly connected to direct expansion coil110by liquid line106and gas and suction line107. Illustratively, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to first branch selector unit210. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from first branch selector unit210to refrigerant flow controlling condensing unit105. Illustratively, first branch selector unit210may be directly or indirectly connected to refrigerant flow controlling condensing unit105by a gas and suction line206, a suction line207, and a liquid line208. In one or more embodiments, first branch selector unit210may be connected to gas and suction line206at a gas and suction line junction216, e.g., first branch selector unit210may be connected to gas and suction line junction216by a first branch selector unit gas and suction line211. Illustratively, first branch selector unit210may be connected to suction line207at a suction line junction217, e.g., first branch selector unit210may be connected to suction line junction217by a first branch selector unit suction line212. In one or more embodiments, first branch selector unit210may be connected to liquid line208at a liquid line junction218, e.g., first branch selector unit210may be connected to liquid line junction218by a first branch selector unit liquid line213. Illustratively, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from first branch selector unit210to direct expansion coil110. In one or more embodiments, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from direct expansion coil110to first branch selector unit210. Illustratively, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to direct expansion coil110. In one or more embodiments, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from direct expansion coil110to refrigerant flow controlling condensing unit105.

Illustratively, second branch selector unit220may be disposed between refrigerant flow controlling condensing unit105and fan coil unit230. In one or more embodiments, second branch selector unit220may be directly or indirectly connected to fan coil unit230by fan coil liquid line226and fan coil gas and suction line227. Illustratively, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to second branch selector unit220. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from second branch selector unit220to refrigerant flow controlling condensing unit105. Illustratively, second branch selector unit220may be directly or indirectly connected to refrigerant flow controlling condensing unit105by gas and suction line206, suction line207, and liquid line208. In one or more embodiments, second branch selector unit220may be connected to gas and suction line206at gas and suction line junction216, e.g., second branch selector unit220may be connected to gas and suction line junction216by a second branch selector unit gas and suction line221. Illustratively, second branch selector unit220may be connected to suction line207at suction line junction217, e.g., second branch selector unit220may be connected to suction line junction217by a second branch selector unit suction line222. In one or more embodiments, second branch selector unit220may be connected to liquid line208at liquid line junction218, e.g., second branch selector unit220may be connected to liquid line junction218by a second branch selector unit liquid line223. Illustratively, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from second branch selector unit220to fan coil unit230. In one or more embodiments, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from fan coil unit230to second branch selector unit220. Illustratively, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to fan coil unit230. In one or more embodiments, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from fan coil unit230to refrigerant flow controlling condensing unit105.

In one or more embodiments, third branch selector unit330may be disposed between auxiliary direct expansion coil310and auxiliary refrigerant flow controlling condensing unit505. Illustratively, third branch selector unit330may be directly or indirectly connected to auxiliary direct expansion coil310by liquid line306and gas and suction line307. In one or more embodiments, auxiliary refrigerant flow controlling condensing unit505may be configured to facilitate a transfer of a refrigerant from auxiliary refrigerant flow controlling condensing unit505to third branch selector unit330. Illustratively, auxiliary refrigerant flow controlling condensing unit505may be configured to facilitate a transfer of a refrigerant from third branch selector unit330to auxiliary refrigerant flow controlling condensing unit505. In one or more embodiments, third branch selector unit330may be directly or indirectly connected to auxiliary refrigerant flow controlling condensing unit505by a gas and suction line506, a suction line507, and a liquid line508. Illustratively, third branch selector unit330may be connected to gas and suction line506at a gas line junction. In one or more embodiments, third branch selector unit330may be connected to suction line507at a suction line junction. Illustratively, third branch selector unit330may be connected to liquid line508at a liquid line junction. In one or more embodiments, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from third branch selector unit330to auxiliary direct expansion coil310. Illustratively, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from auxiliary direct expansion coil310to third branch selector unit330. In one or more embodiments, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from auxiliary refrigerant flow controlling condensing unit505to auxiliary direct expansion coil310. Illustratively, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from auxiliary direct expansion coil310to auxiliary refrigerant flow controlling condensing unit505.

Illustratively, fourth branch selector unit520may be disposed between auxiliary refrigerant flow controlling condensing unit505and auxiliary fan coil unit530. In one or more embodiments, fourth branch selector unit520may be directly or indirectly connected to auxiliary fan coil unit530by auxiliary fan coil liquid line526and auxiliary fan coil gas and suction line527. Illustratively, auxiliary refrigerant flow controlling condensing unit505may be configured to facilitate a transfer of a refrigerant from auxiliary refrigerant flow controlling condensing unit505to fourth branch selector unit520. In one or more embodiments, auxiliary refrigerant flow controlling condensing unit505may be configured to facilitate a transfer of a refrigerant from fourth branch selector unit520to auxiliary refrigerant flow controlling condensing unit505. Illustratively, fourth branch selector unit520may be directly or indirectly connected to auxiliary refrigerant flow controlling condensing unit505by gas and suction line506, suction line507, and liquid line508. In one or more embodiments, fourth branch selector unit520may be connected to gas and suction line506at gas and suction line junction516, e.g., fourth branch selector unit520may be connected to gas and suction line junction516by a fourth branch selector unit gas and suction line521. For example, gas and suction line junction516may comprise a Refnet joint. Illustratively, fourth branch selector unit520may be connected to suction line507at suction line junction517, e.g., fourth branch selector unit520may be connected to suction line junction517by a fourth branch selector unit suction line522. For example, suction line517may comprise a Refnet joint. In one or more embodiments, fourth branch selector unit520may be connected to liquid line508at liquid line junction518, e.g., fourth branch selector unit520may be connected to liquid line junction518by a fourth branch selector unit liquid line523. For example, liquid line junction518may comprise a Refnet joint. Illustratively, fourth branch selector unit520may be configured to facilitate a transfer of a refrigerant from fourth branch selector unit520to auxiliary fan coil unit530. In one or more embodiments, fourth branch selector unit520may be configured to facilitate a transfer of a refrigerant from auxiliary fan coil unit530to fourth branch selector unit520. Illustratively, fourth branch selector unit520may be configured to facilitate a transfer of a refrigerant from auxiliary refrigerant flow controlling condensing unit505to auxiliary fan coil unit530. In one or more embodiments, fourth branch selector unit520may be configured to facilitate a transfer of a refrigerant from auxiliary fan coil unit530to auxiliary refrigerant flow controlling condensing unit505.

Illustratively, first branch selector unit210, second branch selector unit220, third branch selector unit330, and fourth branch selector unit520may comprise a single branch selector unit, e.g., first branch selector unit210, second branch selector unit220, third branch selector unit330, and fourth branch selector unit520may comprise a multi-port branch selector. In one or more embodiments, first branch selector unit210, second branch selector unit220, third branch selector unit330, and fourth branch selector unit520may comprise independent multi-port branch selectors, e.g., first branch selector unit210may comprise a first multi-port branch selector, second branch selector unit220may comprise a second multi-port branch selector, third branch selector unit330may comprise a third multi-port branch selector, and fourth branch selector unit520may comprise a fourth multi-port branch selector. Illustratively, first branch selector unit210, second branch selector unit220, third branch selector unit330, and fourth branch selector unit520may comprise a single branch circuit controller. In one or more embodiments, first branch selector unit210, second branch selector unit220, third branch selector unit330, and fourth branch selector unit520may comprise independent branch circuit controllers, e.g., first branch selector unit210may comprise a first branch circuit controller, second branch selector unit220may comprise a second branch circuit controller, third branch selector unit330may comprise a third branch circuit controller, and fourth branch selector unit520may comprise a fourth branch circuit controller. Illustratively, first branch selector unit210, second branch selector unit220, third branch selector unit330, and fourth branch selector unit520may comprise a single branch selector box. In one or more embodiments, first branch selector unit210, second branch selector unit220, third branch selector unit330, and fourth branch selector unit520may comprise independent branch selector boxes, e.g., first branch selector unit210may comprise a first branch selector box, second branch selector unit220may comprise a second branch selector box, third branch selector unit330may comprise a third branch selector box, and fourth branch selector unit520may comprise a fourth branch selector box.

Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to ventilate controlled environment115by supplying air at a controlled temperature and humidity via supply air stream142. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to ventilate controlled environment115by exhausting air via exhaust air stream144. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to control a temperature of controlled environment115, e.g., fan coil unit230may be configured to increase or decrease a temperature of controlled environment115. In one or more embodiments, auxiliary fan coil unit530may be configured to control a temperature of controlled environment115, e.g., auxiliary fan coil unit530may be configured to increase or decrease a temperature of controlled environment115. In one or more embodiments, fan coil unit230may be configured to control a temperature of a first zone of controlled environment115and auxiliary fan coil unit530may be configured to control a temperature of a second zone of controlled environment115. Illustratively, fan coil unit230and auxiliary fan coil unit530may be configured to simultaneously control a temperature of a first zone of controlled environment115and a temperature of a second zone of controlled environment115.

In one or more embodiments, fan coil unit230may be configured to control a temperature of a first controlled environment115, e.g., fan coil unit230may be configured to increase or decrease a temperature of the first controlled environment115. Illustratively, auxiliary fan coil unit530may be configured to control a temperature of a second controlled environment115, e.g., auxiliary fan coil unit530may be configured to increase or decrease a temperature of the second controlled environment115. In one or more embodiments, fan coil unit230and auxiliary fan coil unit530may be configured to simultaneously control a temperature of a first controlled environment115and a temperature of a second controlled environment115. During summer conditions, fan coil unit230may be configured to decrease a temperature of a first controlled environment115and auxiliary fan coil unit530may be configured to decrease a temperature of a second controlled environment115. During winter conditions, fan coil unit230may be configured to increase a temperature of a first controlled environment115and auxiliary fan coil unit530may be configured to increase a temperature of a second controlled environment115. In one or more embodiments, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase a temperature of a first controlled environment115, e.g., auxiliary fan coil unit530may be configured to simultaneously increase a temperature of a second controlled environment115. Illustratively, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase or decrease a temperature of a first controlled environment115, e.g., auxiliary fan coil unit530may be configured to simultaneously increase or decrease a temperature of a second controlled environment115. In one or more embodiments, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase or decrease a temperature of a first controlled environment115, e.g., auxiliary fan coil unit530may be configured to simultaneously increase or decrease a temperature of a second controlled environment115.

In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may comprise a high efficiency ventilation system in a heat recovery configuration200. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to recover energy from a first fan coil unit230operating in a first mode of operation to improve an operating efficiency of a second fan coil unit230operating in a second mode of operation. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to recover energy from a first auxiliary fan coil unit530operating in a first mode of operation to improve an operating efficiency of a second auxiliary fan coil unit530operating in a second mode of operation. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to recover energy from one or more fan coil units230or one or more auxiliary fan coil units530to improve an operating efficiency of direct expansion coil110or auxiliary direct expansion coil310. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to recover energy from one or more fan coil units230to improve an operating efficiency of direct expansion coil110. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to recover energy from one or more auxiliary fan coil units530to improve an operating efficiency of auxiliary direct expansion coil310. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to recover energy from direct expansion coil110or auxiliary direct expansion coil310to improve an operating efficiency of one or more fan coil units230or one or more auxiliary fan coil units530. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to recovery energy from direct expansion coil110to improve an operating efficiency of one or more fan coil units230. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to recover energy from auxiliary direct expansion coil310to improve an operating efficiency of one or more auxiliary fan coil units530.

Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to selectively distribute heat recovered from one or more fan coil units230and one or more auxiliary fan coil units530, e.g., high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to uniformly distribute heat recovered from one or more fan coil units230and one or more auxiliary fan coil units530. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to distribute heat recovered from one or more fan coil units230and one or more auxiliary fan coil units530according to one or more distribution variables, e.g., high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500may be configured to distribute heat recovered from one or more fan coil units230and one or more auxiliary fan coil units530according to one or more distribution priorities. Illustratively, a particular fan coil unit230may have a higher distribution priority than direct expansion coil110, e.g., refrigerant flow controlling condensing unit105may be configured to distribute heat recovered from one or more fan coil units230to the particular fan coil unit230before distributing heat recovered from one or more fan coil units230to direct expansion coil110. For example, refrigerant flow controlling condensing unit105may be configured to distribute heat recovered from one or more fan coil units230to direct expansion coil110only if the particular fan coil unit230is either in a standby mode or is operating in a cooling mode. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to distribute heat recovered from one or more fan coil units230to direct expansion coil110only if each fan coil unit230of the one or more fan coil units230is either in a standby mode or is operating in a cooling mode. Illustratively, a particular auxiliary fan coil unit530may have a higher distribution priority than auxiliary direct expansion coil310, e.g., auxiliary refrigerant flow controlling condensing unit505may be configured to distribute heat recovered from one or more auxiliary fan coil units530to the particular auxiliary fan coil unit530before distributing heat recovered from one or more auxiliary fan coil units530to auxiliary direct expansion coil310. For example, auxiliary refrigerant flow controlling condensing unit505may be configured to distribute heat recovered from one or more auxiliary fan coil units530to auxiliary direct expansion coil310only if the particular auxiliary fan coil unit530is either in a standby mode or is operating in a cooling mode. In one or more embodiments, auxiliary refrigerant flow controlling condensing unit505may be configured to distribute heat recovered from one or more auxiliary fan coil units530to auxiliary direct expansion coil310only if each auxiliary fan coil unit530of the one or more auxiliary fan coil units530is either in a standby mode or is operating in a cooling mode.

Illustratively, refrigerant flow controlling condensing unit105may be configured to communicate information about excess heating capacity to auxiliary refrigerant flow controlling condensing unit505to improve an operating efficiency of high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500. In one or more embodiments, refrigerant flow controlling condenses ing unit105may be configured to communicate information about heat recovered from one or more fan coil units230to auxiliary refrigerant flow controlling condensing unit505, e.g., refrigerant flow controlling condensing unit105may be configured to communicate to auxiliary refrigerant flow controlling condensing unit505that recovered heat is available for direct expansion coil110. Illustratively, auxiliary refrigerant flow controlling condensing unit505may be configured to receive information from refrigerant flow controlling condensing unit105and then adjust a heating capacity of auxiliary direct expansion coil310, e.g., auxiliary refrigerant flow controlling condensing unit505may be configured to decrease a heating capacity of auxiliary direct expansion coil310in response to a communication that heat recovered from one or more fan coil units230is available for direct expansion coil110. In one or more embodiments, auxiliary refrigerant flow controlling condensing unit505may be configured to communicate information about excess heating capacity to refrigerant flow controlling condensing unit105to improve an operating efficiency of high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for outside air stream500. Illustratively, auxiliary refrigerant flow controlling condensing unit505may be configured to communicate information about heat recovered from one or more auxiliary fan coil units530to refrigerant flow controlling condensing unit105, e.g., auxiliary refrigerant flow controlling condensing unit505may be configured to communicate to refrigerant flow controlling condensing unit105that recovered heat is available for auxiliary direct expansion coil310. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to receive information from auxiliary refrigerant flow controlling condensing unit505and then adjust a heating capacity of direct expansion coil110, e.g., refrigerant flow controlling condensing unit105may be configured to decrease a heating capacity of direct expansion coil110in response to a communication that heat recovered from one or more auxiliary fan coil units530is available for auxiliary direct expansion coil310.

FIG. 6is a schematic diagram illustrating a high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may comprise a refrigerant flow controlling condensing unit105, an auxiliary refrigerant flow controlling condensing unit505, a direct expansion coil110, an auxiliary direct expansion coil310, a bypass mechanism305, a first branch selector unit210, a second branch selector unit220, a third branch selector unit330, a fourth branch selector unit520, a fan coil unit230, and an auxiliary fan coil unit530. Illustratively, first branch selector unit210may be disposed between refrigerant flow controlling condensing unit105and direct expansion coil110. In one or more embodiments, first branch selector unit210may be directly or indirectly connected to direct expansion coil110by liquid line106and gas and suction line107. Illustratively, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to first branch selector unit210. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from first branch selector unit210to refrigerant flow controlling condensing unit105. Illustratively, first branch selector unit210may be directly or indirectly connected to refrigerant flow controlling condensing unit105by a gas and suction line206, a suction line207, and a liquid line208. In one or more embodiments, first branch selector unit210may be connected to gas and suction line206at a gas and suction line junction216, e.g., first branch selector unit210may be connected to gas and suction line junction216by a first branch selector unit gas and suction line211. Illustratively, first branch selector unit210may be connected to suction line207at a suction line junction217, e.g., first branch selector unit210may be connected to suction line junction217by a first branch selector unit suction line212. In one or more embodiments, first branch selector unit210may be connected to liquid line208at a liquid line junction218, e.g., first branch selector unit210may be connected to liquid line junction218by a first branch selector unit liquid line213. Illustratively, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from first branch selector unit210to direct expansion coil110. In one or more embodiments, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from direct expansion coil110to first branch selector unit210. Illustratively, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to direct expansion coil110. In one or more embodiments, first branch selector unit210may be configured to facilitate a transfer of a refrigerant from direct expansion coil110to refrigerant flow controlling condensing unit105.

Illustratively, second branch selector unit220may be disposed between refrigerant flow controlling condensing unit105and fan coil unit230. In one or more embodiments, second branch selector unit220may be directly or indirectly connected to fan coil unit230by fan coil liquid line226and fan coil gas and suction line227. Illustratively, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to second branch selector unit220. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to facilitate a transfer of a refrigerant from second branch selector unit220to refrigerant flow controlling condensing unit105. Illustratively, second branch selector unit220may be directly or indirectly connected to refrigerant flow controlling condensing unit105by gas and suction line206, suction line207, and liquid line208. In one or more embodiments, second branch selector unit220may be connected to gas and suction line206at gas and suction line junction216, e.g., second branch selector unit220may be connected to gas and suction line junction216by a second branch selector unit gas and suction line221. Illustratively, second branch selector unit220may be connected to suction line207at suction line junction217, e.g., second branch selector unit220may be connected to suction line junction217by a second branch selector unit suction line222. In one or more embodiments, second branch selector unit220may be connected to liquid line208at liquid line junction218, e.g., second branch selector unit220may be connected to liquid line junction218by a second branch selector unit liquid line223. Illustratively, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from second branch selector unit220to fan coil unit230. In one or more embodiments, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from fan coil unit230to second branch selector unit220. Illustratively, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from refrigerant flow controlling condensing unit105to fan coil unit230. In one or more embodiments, second branch selector unit220may be configured to facilitate a transfer of a refrigerant from fan coil unit230to refrigerant flow controlling condensing unit105.

In one or more embodiments, third branch selector unit330may be disposed between auxiliary direct expansion coil310and auxiliary refrigerant flow controlling condensing unit505. Illustratively, third branch selector unit330may be directly or indirectly connected to auxiliary direct expansion coil310by liquid line306and gas and suction line307. In one or more embodiments, auxiliary refrigerant flow controlling condensing unit505may be configured to facilitate a transfer of a refrigerant from auxiliary refrigerant flow controlling condensing unit505to third branch selector unit330. Illustratively, auxiliary refrigerant flow controlling condensing unit505may be configured to facilitate a transfer of a refrigerant from third branch selector unit330to auxiliary refrigerant flow controlling condensing unit505. In one or more embodiments, third branch selector unit330may be directly or indirectly connected to auxiliary refrigerant flow controlling condensing unit505by a gas and suction line506, a suction line507, and a liquid line508. Illustratively, third branch selector unit330may be connected to gas and suction line506at a gas line junction. In one or more embodiments, third branch selector unit330may be connected to suction line507at a suction line junction. Illustratively, third branch selector unit330may be connected to liquid line508at a liquid line junction. In one or more embodiments, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from third branch selector unit330to auxiliary direct expansion coil310. Illustratively, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from auxiliary direct expansion coil310to third branch selector unit330. In one or more embodiments, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from auxiliary refrigerant flow controlling condensing unit505to auxiliary direct expansion coil310. Illustratively, third branch selector unit330may be configured to facilitate a transfer of a refrigerant from auxiliary direct expansion coil310to auxiliary refrigerant flow controlling condensing unit505.

Illustratively, fourth branch selector unit520may be disposed between auxiliary refrigerant flow controlling condensing unit505and auxiliary fan coil unit530. In one or more embodiments, fourth branch selector unit520may be directly or indirectly connected to auxiliary fan coil unit530by auxiliary fan coil liquid line526and auxiliary fan coil gas and suction line527. Illustratively, auxiliary refrigerant flow controlling condensing unit505may be configured to facilitate a transfer of a refrigerant from auxiliary refrigerant flow controlling condensing unit505to fourth branch selector unit520. In one or more embodiments, auxiliary refrigerant flow controlling condensing unit505may be configured to facilitate a transfer of a refrigerant from fourth branch selector unit520to auxiliary refrigerant flow controlling condensing unit505. Illustratively, fourth branch selector unit520may be directly or indirectly connected to auxiliary refrigerant flow controlling condensing unit505by gas and suction line506, suction line507, and liquid line508. In one or more embodiments, fourth branch selector unit520may be connected to gas and suction line506at gas and suction line junction516, e.g., fourth branch selector unit520may be connected to gas and suction line junction516by a fourth branch selector unit gas and suction line521. Illustratively, fourth branch selector unit520may be connected to suction line507at suction line junction517, e.g., fourth branch selector unit520may be connected to suction line junction517by a fourth branch selector unit suction line522. In one or more embodiments, fourth branch selector unit520may be connected to liquid line508at liquid line junction518, e.g., fourth branch selector unit520may be connected to liquid line junction518by a fourth branch selector unit liquid line523. Illustratively, fourth branch selector unit520may be configured to facilitate a transfer of a refrigerant from fourth branch selector unit520to auxiliary fan coil unit530. In one or more embodiments, fourth branch selector unit520may be configured to facilitate a transfer of a refrigerant from auxiliary fan coil unit530to fourth branch selector unit520. Illustratively, fourth branch selector unit520may be configured to facilitate a transfer of a refrigerant from auxiliary refrigerant flow controlling condensing unit505to auxiliary fan coil unit530. In one or more embodiments, fourth branch selector unit520may be configured to facilitate a transfer of a refrigerant from auxiliary fan coil unit530to auxiliary refrigerant flow controlling condensing unit505.

Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to ventilate controlled environment115by supplying air at a controlled temperature and humidity via supply air stream142. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to ventilate controlled environment115by exhausting air via exhaust air stream144. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to control a temperature of controlled environment115, e.g., fan coil unit230may be configured to increase or decrease a temperature of controlled environment115. In one or more embodiments, auxiliary fan coil unit530may be configured to control a temperature of controlled environment115, e.g., auxiliary fan coil unit530may be configured to increase or decrease a temperature of controlled environment115. In one or more embodiments, fan coil unit230may be configured to control a temperature of a first zone of controlled environment115and auxiliary fan coil unit530may be configured to control a temperature of a second zone of controlled environment115. Illustratively, fan coil unit230and auxiliary fan coil unit530may be configured to simultaneously control a temperature of a first zone of controlled environment115and a temperature of a second zone of controlled environment115.

In one or more embodiments, fan coil unit230may be configured to control a temperature of a first controlled environment115, e.g., fan coil unit230may be configured to increase or decrease a temperature of the first controlled environment115. Illustratively, auxiliary fan coil unit530may be configured to control a temperature of a second controlled environment115, e.g., auxiliary fan coil unit530may be configured to increase or decrease a temperature of the second controlled environment115. In one or more embodiments, fan coil unit230and auxiliary fan coil unit530may be configured to simultaneously control a temperature of a first controlled environment115and a temperature of a second controlled environment115. During summer conditions, fan coil unit230may be configured to decrease a temperature of a first controlled environment115and auxiliary fan coil unit530may be configured to decrease a temperature of a second controlled environment115. During winter conditions, fan coil unit230may be configured to increase a temperature of a first controlled environment115and auxiliary fan coil unit530may be configured to increase a temperature of a second controlled environment115. In one or more embodiments, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase a temperature of a first controlled environment115, e.g., auxiliary fan coil unit530may be configured to simultaneously increase a temperature of a second controlled environment115. Illustratively, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase or decrease a temperature of a first controlled environment115, e.g., auxiliary fan coil unit530may be configured to simultaneously increase or decrease a temperature of a second controlled environment115. In one or more embodiments, direct expansion coil110and auxiliary direct expansion coil310may be configured to increase a temperature of outside air stream141and fan coil unit230may be configured to simultaneously increase or decrease a temperature of a first controlled environment115, e.g., auxiliary fan coil unit530may be configured to simultaneously increase or decrease a temperature of a second controlled environment115.

In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may comprise a high efficiency ventilation system in a heat recovery configuration200. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to recover energy from a first fan coil unit230operating in a first mode of operation to improve an operating efficiency of a second fan coil unit230operating in a second mode of operation. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to recover energy from a first auxiliary fan coil unit530operating in a first mode of operation to improve an operating efficiency of a second auxiliary fan coil unit530operating in a second mode of operation. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to recover energy from one or more fan coil units230or one or more auxiliary fan coil units530to improve an operating efficiency of direct expansion coil110or auxiliary direct expansion coil310. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to recover energy from one or more fan coil units230to improve an operating efficiency of direct expansion coil110. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to recover energy from one or more auxiliary fan coil units530to improve an operating efficiency of auxiliary direct expansion coil310. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to recover energy from direct expansion coil110or auxiliary direct expansion coil310to improve an operating efficiency of one or more fan coil units230or one or more auxiliary fan coil units530. Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to recovery energy from direct expansion coil110to improve an operating efficiency of one or more fan coil units230. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to recover energy from auxiliary direct expansion coil310to improve an operating efficiency of one or more auxiliary fan coil units530.

Illustratively, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to selectively distribute heat recovered from one or more fan coil units230and one or more auxiliary fan coil units530, e.g., high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to uniformly distribute heat recovered from one or more fan coil units230and one or more auxiliary fan coil units530. In one or more embodiments, high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to distribute heat recovered from one or more fan coil units230and one or more auxiliary fan coil units530according to one or more distribution variables, e.g., high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600may be configured to distribute heat recovered from one or more fan coil units230and one or more auxiliary fan coil units530according to one or more distribution priorities. Illustratively, a particular fan coil unit230may have a higher distribution priority than direct expansion coil110, e.g., refrigerant flow controlling condensing unit105may be configured to distribute heat recovered from one or more fan coil units230to the particular fan coil unit230before distributing heat recovered from one or more fan coil units230to direct expansion coil110. For example, refrigerant flow controlling condensing unit105may be configured to distribute heat recovered from one or more fan coil units230to direct expansion coil110only if the particular fan coil unit230is either in a standby mode or is operating in a cooling mode. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to distribute heat recovered from one or more fan coil units230to direct expansion coil110only if each fan coil unit230of the one or more fan coil units230is either in a standby mode or is operating in a cooling mode. Illustratively, a particular auxiliary fan coil unit530may have a higher distribution priority than auxiliary direct expansion coil310, e.g., auxiliary refrigerant flow controlling condensing unit505may be configured to distribute heat recovered from one or more auxiliary fan coil units530to the particular auxiliary fan coil unit530before distributing heat recovered from one or more auxiliary fan coil units530to auxiliary direct expansion coil310. For example, auxiliary refrigerant flow controlling condensing unit505may be configured to distribute heat recovered from one or more auxiliary fan coil units530to auxiliary direct expansion coil310only if the particular auxiliary fan coil unit530is either in a standby mode or is operating in a cooling mode. In one or more embodiments, auxiliary refrigerant flow controlling condensing unit505may be configured to distribute heat recovered from one or more auxiliary fan coil units530to auxiliary direct expansion coil310only if each auxiliary fan coil unit530of the one or more auxiliary fan coil units530is either in a standby mode or is operating in a cooling mode.

Illustratively, refrigerant flow controlling condensing unit105may be configured to communicate information about excess heating capacity to auxiliary refrigerant flow controlling condensing unit505to improve an operating efficiency of high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to communicate information about heat recovered from one or more fan coil units230to auxiliary refrigerant flow controlling condensing unit505, e.g., refrigerant flow controlling condensing unit105may be configured to communicate to auxiliary refrigerant flow controlling condensing unit505that recovered heat is available for direct expansion coil110. Illustratively, auxiliary refrigerant flow controlling condensing unit505may be configured to receive information from refrigerant flow controlling condensing unit105and then adjust a heating capacity of auxiliary direct expansion coil310, e.g., auxiliary refrigerant flow controlling condensing unit505may be configured to decrease a heating capacity of auxiliary direct expansion coil310in response to a communication that heat recovered from one or more fan coil units230is available for direct expansion coil110. In one or more embodiments, auxiliary refrigerant flow controlling condensing unit505may be configured to communicate information about excess heating capacity to refrigerant flow controlling condensing unit105to improve an operating efficiency of high efficiency ventilation system with an auxiliary refrigerant flow controlling condensing unit for return air stream600. Illustratively, auxiliary refrigerant flow controlling condensing unit505may be configured to communicate information about heat recovered from one or more auxiliary fan coil units530to refrigerant flow controlling condensing unit105, e.g., auxiliary refrigerant flow controlling condensing unit505may be configured to communicate to refrigerant flow controlling condensing unit105that recovered heat is available for auxiliary direct expansion coil310. In one or more embodiments, refrigerant flow controlling condensing unit105may be configured to receive information from auxiliary refrigerant flow controlling condensing unit505and then adjust a heating capacity of direct expansion coil110, e.g., refrigerant flow controlling condensing unit105may be configured to decrease a heating capacity of direct expansion coil110in response to a communication that heat recovered from one or more auxiliary fan coil units530is available for auxiliary direct expansion coil310.

The foregoing description has been directed to particular embodiments of this invention. It will be apparent; however, that other variations and modifications may be made to the described embodiments, with the attainment of some or all of their advantages. Specifically, it should be noted that the principles of the present invention may be implemented in any system. Furthermore, while this description has been written in terms of a system for heating, ventilation, and air conditioning, the teachings of the present invention are equally suitable to any systems where the functionality may be employed. Therefore, it is the object of the appended claims to cover all such variations and modifications as come within the true spirit and scope of the invention.