Patent Publication Number: US-11035578-B2

Title: Removable fin heat exchanger systems and methods

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims priority from and the benefit of U.S. Provisional Application Ser. No. 62/808,715, entitled “REMOVABLE FIN HEAT EXCHANGER SYSTEMS AND METHODS,” filed Feb. 21, 2019, which is hereby incorporated by reference in its entirety for all purposes. 
    
    
     BACKGROUND 
     This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present techniques, which are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present disclosure. Accordingly, it should be understood that these statements are to be read in this light and not as an admission of any kind. 
     Environmental control systems are utilized in residential, commercial, and industrial environments to control environmental properties, such as temperature and humidity, for occupants of the respective environments. The environmental control system may control the environmental properties through control of an air flow delivered to, and ventilated from, the environment. For example, the air flow may be directed through an air flow path of an HVAC system, where heat is exchanged between the air flow and a refrigerant flowing through the HVAC system in a heat exchanger disposed in the air flow path. In some embodiments, operation of the heat exchanger is configured to be disabled or suspended such that heat is not exchanged between the air flow and the refrigerant during certain operating modes of the HVAC system. However, the air flow may still be directed across the non-operational heat exchanger in such operating modes. It is now recognized that such traditional embodiments may decrease an efficiency of the HVAC system. 
     SUMMARY 
     The present disclosure relates to a fin heat exchanger, including a header, a set of tubes fluidly coupled to the header, and a mount configured to engage with and disengage from the set of tubes. The mount includes a fin section configured to extend between adjacent tubes of the set of tubes in an engaged mount configuration, and configured to be separated from the set of tubes in an unengaged mount configuration. 
     The present disclosure also relates to a heating, ventilation, and/or air conditioning (HVAC) system, including a heat exchanger having a set of tubes configured to flow a refrigerant in a first operating mode. The HVAC system further includes a mount of the heat exchanger having fins configured to extend between adjacent tubes of the set of tubes in an engaged mount configuration during the first operating mode, and configured to be separated from the set of tubes in an unengaged mount configuration during a second operating mode different than the first operating mode. 
     The present disclosure further relates to a heat exchanger, including a header and a set of microchannel tubes fluidly connected to and extending from the header. The heat exchanger further includes a mount having a set of plates configured to engage with the set of microchannel tubes in an engaged mount configuration, and configured to be separated from the set of microchannel tubes in a disengaged mount configuration. The heat exchanger further includes a fin section coupled to and disposed between adjacent plates of the set of plates. The fin section is configured to be disposed between adjacent microchannel tubes of the set of microchannel tubes in the engaged mount configuration and is configured to be separate from the set of microchannel tubes in the disengaged mount configuration. 
    
    
     
       DRAWINGS 
         FIG. 1  is a perspective view of a heating, ventilation, and/or air conditioning (HVAC) system for building environmental management that may employ one or more HVAC units, in accordance with aspects of the present disclosure; 
         FIG. 2  is a perspective view of an HVAC unit that may be used in the HVAC system of  FIG. 1 , in accordance with aspects of the present disclosure; 
         FIG. 3  is a perspective view of a residential, split heating and cooling system, in accordance with aspects of the present disclosure; 
         FIG. 4  is a schematic of a vapor compression system that may be used in an HVAC system, in accordance with aspects of the present disclosure; 
         FIG. 5  is a schematic perspective view of an HVAC system having a heat exchanger base and a removable mount coupled to the heat exchanger base and having fins, in accordance with aspects of the present disclosure; 
         FIG. 6  is a schematic perspective view of the heat exchanger base and the removable mount of  FIG. 5  in an engaged mount configuration, in accordance with aspects of the present disclosure; 
         FIG. 7  is a schematic perspective view of the heat exchanger base and the removable mount of  FIG. 5  in a disengaged mount configuration, in accordance with aspects of the present disclosure; 
         FIG. 8  is a schematic perspective view of a plate of the removable mount of  FIG. 5 , in accordance with aspects of the present disclosure; 
         FIG. 9  is a schematic perspective view of a plate of the removable mount of  FIG. 5 , in accordance with aspects of the present disclosure; 
         FIG. 10  is a schematic perspective view of a plate of the removable mount of  FIG. 5 , in accordance with aspects of the present disclosure; 
         FIG. 11  is a schematic perspective view of a plate of the removable mount of  FIG. 5 , in accordance with aspects of the present disclosure; 
         FIG. 12  is a schematic perspective view of the removable mount of  FIG. 5 , in accordance with aspects of the present disclosure; 
         FIG. 13  is a schematic perspective view of the removable mount of  FIG. 5 , in accordance with aspects of the present disclosure; and 
         FIG. 14  is a cross-sectional view of a microchannel tube of the heat exchanger base of  FIG. 5 , in accordance with aspects of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     One or more specific embodiments will be described below. In an effort to provide a concise description of these embodiments, not all features of an actual implementation are described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers&#39; specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure. 
     When introducing elements of various embodiments of the present disclosure, the articles “a,” “an,” and “the” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. Additionally, it should be understood that references to “one embodiment” or “an embodiment” of the present disclosure are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. 
     The present disclosure is directed to heating, ventilation, and/or air conditioning (HVAC) systems that use a heat exchanger for transferring heat between a refrigerant and an air flow. In some embodiments, the heat exchanger is disposed within an air flow path such that the air flow is directed across tubes of the heat exchanger and is placed in thermal communication with a refrigerant flowing through the tubes. After heat is exchanged between the air flow and the refrigerant, the air flow may be directed to spaces to condition the spaces. As the air flow is directed through the air flow path, pressure losses, for example from friction when flowing across fins of the heat exchanger, may decrease the velocity of the air flow. Thus, the HVAC system may use an air moving device, such as a fan or blower, to increase the velocity of air flow to a desired velocity for supplying the air flow to the conditioned space. 
     As described above, when the heat exchanger is in heat transfer operation, refrigerant at a controlled temperature and pressure is directed through the heat exchanger and exchanges heat with the air flow as the air flow passes across the heat exchanger. Generally, the HVAC system may be configured to operate in a cooling mode and a heating mode, and a particular heat exchanger of the HVAC system may operate to transfer heat in only one of the cooling or heating modes. In some embodiments, each heat exchanger of the HVAC system may operate to condition the air flow in only one of the heating or cooling modes. For example, in one of the modes, such as the heating mode, a particular heat exchanger, such as the evaporator, may not be used to transfer heat with the air flow. In traditional embodiments, the traditional heat exchanger may remain within the air flow path when not in heat transfer operational, and the air flow may still be directed across fins of the traditional heat exchanger. As a result, the air flow may experience pressure loss when flowing across the traditional heat exchanger. For example, in a winter season when the HVAC system is in a heating mode and the traditional heat exchanger is not in heat transfer operation, the traditional heat exchanger may cause a pressure loss in an air flow passing thereover without providing any heat transfer benefits, resulting in HVAC system inefficiencies. In other embodiments, the entire traditional heat exchanger may be removed from the air flow path when not in heat transfer operation, which may involve expensive controls and/or expensive and complicated maintenance procedures. 
     Thus, in accordance with embodiments of the present disclosure, it is presently recognized that disengaging fins from the heat exchanger, and removing the fins from the air flow path, may improve operation of the HVAC system. In doing so, pressure loss of the air flow may be reduced or negated, compared to traditional embodiments, when the HVAC system is operating in a mode where the heat exchanger is not in heat transfer operation. That is, if the fins are removed from the heat exchanger when the heat exchanger is not in heat transfer operation, an undesired decrease in velocity of the air flow caused by the fins in traditional embodiments may be reduced or negated. As a result, the HVAC system may operate more efficiently. Specifically, the substantial removal of the fins of the heat exchanger from the air flow path when the heat exchanger is not in heat transfer operation enables the air flow to more easily flow through the heat exchanger, thereby reducing a decrease in velocity of the air flow. As a result, an air moving device of the HVAC system that increases the velocity of the air flow may operate at a lower power to increase the efficiency of the HVAC system. 
     Turning now to the drawings,  FIG. 1  illustrates an embodiment of a heating, ventilation, and/or air conditioning (HVAC) system for environmental management that may employ one or more HVAC units. As used herein, an HVAC system includes any number of components configured to enable regulation of parameters related to climate characteristics, such as temperature, humidity, air flow, pressure, air quality, and so forth. For example, an “HVAC system” as used herein is defined as conventionally understood and as further described herein. Components or parts of an “HVAC system” may include, but are not limited to, all, some of, or individual parts such as a heat exchanger, a heater, an air flow control device, such as a fan, a sensor configured to detect a climate characteristic or operating parameter, a filter, a control device configured to regulate operation of an HVAC system component, a component configured to enable regulation of climate characteristics, or a combination thereof. An “HVAC system” is a system configured to provide such functions as heating, cooling, ventilation, dehumidification, pressurization, refrigeration, filtration, or any combination thereof. The embodiments described herein may be utilized in a variety of applications to control climate characteristics, such as residential, commercial, industrial, transportation, or other applications where climate control is desired. 
     In the illustrated embodiment, a building  10  is air conditioned by a system that includes an HVAC unit  12 . The building  10  may be a commercial structure or a residential structure. As shown, the HVAC unit  12  is disposed on the roof of the building  10 ; however, the HVAC unit  12  may be located in other equipment rooms or areas adjacent the building  10 . The HVAC unit  12  may be a single package unit containing other equipment, such as a blower, integrated air handler, and/or auxiliary heating unit. In other embodiments, the HVAC unit  12  may be part of a split HVAC system, such as the system shown in  FIG. 3 , which includes an outdoor HVAC unit  58  and an indoor HVAC unit  56 . The HVAC unit  12  is an air cooled device that implements a refrigeration cycle to provide conditioned air to the building  10 . Specifically, the HVAC unit  12  may include one or more heat exchangers across which an airflow is passed to condition the airflow before the airflow is supplied to the building. In the illustrated embodiment, the HVAC unit  12  is a rooftop unit (RTU) that conditions a supply air stream, such as environmental air and/or a return airflow from the building  10 . After the HVAC unit  12  conditions the air, the air is supplied to the building  10  via ductwork  14  extending throughout the building  10  from the HVAC unit  12 . For example, the ductwork  14  may extend to various individual floors or other sections of the building  10 . In certain embodiments, the HVAC unit  12  may be a heat pump that provides both heating and cooling to the building with one refrigeration circuit configured to operate in different modes. In other embodiments, the HVAC unit  12  may include one or more refrigeration circuits for cooling an air stream and a furnace for heating the air stream. 
     A control device  16 , one type of which may be a thermostat, may be used to designate the temperature of the conditioned air. The control device  16  also may be used to control the flow of air through the ductwork  14 . For example, the control device  16  may be used to regulate operation of one or more components of the HVAC unit  12  or other components, such as dampers and fans, within the building  10  that may control flow of air through and/or from the ductwork  14 . In some embodiments, other devices may be included in the system, such as pressure and/or temperature transducers or switches that sense the temperatures and pressures of the supply air, return air, and so forth. Moreover, the control device  16  may include computer systems that are integrated with or separate from other building control or monitoring systems, and even systems that are remote from the building  10 . 
       FIG. 2  is a perspective view of an embodiment of the HVAC unit  12 . In the illustrated embodiment, the HVAC unit  12  is a single package unit that may include one or more independent refrigeration circuits and components that are tested, charged, wired, piped, and ready for installation. The HVAC unit  12  may provide a variety of heating and/or cooling functions, such as cooling only, heating only, cooling with electric heat, cooling with dehumidification, cooling with gas heat, or cooling with a heat pump. As described above, the HVAC unit  12  may directly cool and/or heat an air stream provided to the building  10  to condition a space in the building  10 . 
     As shown in the illustrated embodiment of  FIG. 2 , a cabinet  24  encloses the HVAC unit  12  and provides structural support and protection to the internal components from environmental and other contaminants. In some embodiments, the cabinet  24  may be constructed of galvanized steel and insulated with aluminum foil faced insulation. Rails  26  may be joined to the bottom perimeter of the cabinet  24  and provide a foundation for the HVAC unit  12 . In certain embodiments, the rails  26  may provide access for a forklift and/or overhead rigging to facilitate installation and/or removal of the HVAC unit  12 . In some embodiments, the rails  26  may fit into “curbs” on the roof to enable the HVAC unit  12  to provide air to the ductwork  14  from the bottom of the HVAC unit  12  while blocking elements such as rain from leaking into the building  10 . 
     The HVAC unit  12  includes heat exchangers  28  and  30  in fluid communication with one or more refrigeration circuits. Tubes within the heat exchangers  28  and  30  may circulate refrigerant (for example, R-410A, steam, or water) through the heat exchangers  28  and  30 . The tubes may be of various types, such as multichannel tubes, conventional copper or aluminum tubing, and so forth. Together, the heat exchangers  28  and  30  may implement a thermal cycle in which the refrigerant undergoes phase changes and/or temperature changes as it flows through the heat exchangers  28  and  30  to produce heated and/or cooled air. For example, the heat exchanger  28  may function as a condenser where heat is released from the refrigerant to ambient air, and the heat exchanger  30  may function as an evaporator where the refrigerant absorbs heat to cool an air stream. In other embodiments, the HVAC unit  12  may operate in a heat pump mode where the roles of the heat exchangers  28  and  30  may be reversed. That is, the heat exchanger  28  may function as an evaporator and the heat exchanger  30  may function as a condenser. In further embodiments, the HVAC unit  12  may include a furnace for heating the air stream that is supplied to the building  10 . While the illustrated embodiment of  FIG. 2  shows the HVAC unit  12  having two of the heat exchangers  28  and  30 , in other embodiments, the HVAC unit  12  may include one heat exchanger or more than two heat exchangers. 
     The heat exchanger  30  is located within a compartment  31  that separates the heat exchanger  30  from the heat exchanger  28 . Fans  32  draw air from the environment through the heat exchanger  28 . Air may be heated and/or cooled as the airflows through the heat exchanger  28  before being released back to the environment surrounding the rooftop unit  12 . A blower assembly  34 , powered by a motor  36 , draws air through the heat exchanger  30  to heat or cool the air. The heated or cooled air may be directed to the building  10  by the ductwork  14 , which may be connected to the HVAC unit  12 . Before flowing through the heat exchanger  30 , the conditioned airflows through one or more filters  38  that may remove particulates and contaminants from the air. In certain embodiments, the filters  38  may be disposed on the air intake side of the heat exchanger  30  to prevent contaminants from contacting the heat exchanger  30 . 
     The HVAC unit  12  also may include other equipment for implementing the thermal cycle. Compressors  42  increase the pressure and temperature of the refrigerant before the refrigerant enters the heat exchanger  28 . The compressors  42  may be any suitable type of compressors, such as scroll compressors, rotary compressors, screw compressors, or reciprocating compressors. In some embodiments, the compressors  42  may include a pair of hermetic direct drive compressors arranged in a dual stage configuration  44 . However, in other embodiments, any number of the compressors  42  may be provided to achieve various stages of heating and/or cooling. As may be appreciated, additional equipment and devices may be included in the HVAC unit  12 , such as a solid-core filter drier, a drain pan, a disconnect switch, an economizer, pressure switches, phase monitors, and humidity sensors, among other things. 
     The HVAC unit  12  may receive power through a terminal block  46 . For example, a high voltage power source may be connected to the terminal block  46  to power the equipment. The operation of the HVAC unit  12  may be governed or regulated by a control board  48 . The control board  48  may include control circuitry connected to a thermostat, sensors, and alarms (one or more being referred to herein separately or collectively as the control device  16 ). The control circuitry may be configured to control operation of the equipment, provide alarms, and monitor safety switches. Wiring  49  may connect the control board  48  and the terminal block  46  to the equipment of the HVAC unit  12 . 
       FIG. 3  illustrates a residential heating and cooling system  50 , also in accordance with present techniques. The residential heating and cooling system  50  may provide heated and cooled air to a residential structure, as well as provide outside air for ventilation and provide improved indoor air quality (IAQ) through devices such as ultraviolet lights and air filters. In the illustrated embodiment, the residential heating and cooling system  50  is a split HVAC system. In general, a residence  52  conditioned by a split HVAC system may include refrigerant conduits  54  that operatively couple the indoor unit  56  to the outdoor unit  58 . The indoor unit  56  may be positioned in a utility room, an attic, a basement, and so forth. The outdoor unit  58  is typically situated adjacent to a side of residence  52  and is covered by a shroud to protect the system components and to prevent leaves and other debris or contaminants from entering the unit. The refrigerant conduits  54  transfer refrigerant between the indoor unit  56  and the outdoor unit  58 , typically transferring primarily liquid refrigerant in one direction and primarily vaporized refrigerant in an opposite direction. 
     When the system shown in  FIG. 3  is operating as an air conditioner, a heat exchanger  60  in the outdoor unit  58  serves as a condenser for re-condensing vaporized refrigerant flowing from the indoor unit  56  to the outdoor unit  58  via one of the refrigerant conduits  54 . In these applications, a heat exchanger  62  of the indoor unit functions as an evaporator. Specifically, the heat exchanger  62  receives liquid refrigerant (which may be expanded by an expansion device, not shown) and evaporates the refrigerant before returning it to the outdoor unit  58 . 
     The outdoor unit  58  draws environmental air through the heat exchanger  60  using a fan  64  and expels the air above the outdoor unit  58 . When operating as an air conditioner, the air is heated by the heat exchanger  60  within the outdoor unit  58  and exits the unit at a temperature higher than it entered. The indoor unit  56  includes a blower or fan  66  that directs air through or across the indoor heat exchanger  62 , where the air is cooled when the system is operating in air conditioning mode. Thereafter, the air is passed through ductwork  68  that directs the air to the residence  52 . The overall system operates to maintain a desired temperature as set by a system controller. When the temperature sensed inside the residence  52  is higher than the set point on the thermostat (plus a small amount), the residential heating and cooling system  50  may become operative to refrigerate additional air for circulation through the residence  52 . When the temperature reaches the set point (minus a small amount), the residential heating and cooling system  50  may stop the refrigeration cycle temporarily. 
     The residential heating and cooling system  50  may also operate as a heat pump. When operating as a heat pump, the roles of heat exchangers  60  and  62  are reversed. That is, the heat exchanger  60  of the outdoor unit  58  will serve as an evaporator to evaporate refrigerant and thereby cool air entering the outdoor unit  58  as the air passes over outdoor the heat exchanger  60 . The indoor heat exchanger  62  will receive a stream of air blown over it and will heat the air by condensing the refrigerant. 
     In some embodiments, the indoor unit  56  may include a furnace system  70 . For example, the indoor unit  56  may include the furnace system  70  when the residential heating and cooling system  50  is not configured to operate as a heat pump. The furnace system  70  may include a burner assembly and heat exchanger, among other components, inside the indoor unit  56 . Fuel is provided to the burner assembly of the furnace  70  where it is mixed with air and combusted to form combustion products. The combustion products may pass through tubes or piping in a heat exchanger (that is, separate from heat exchanger  62 ), such that air directed by the blower  66  passes over the tubes or pipes and extracts heat from the combustion products. The heated air may then be routed from the furnace system  70  to the ductwork  68  for heating the residence  52 . 
       FIG. 4  is an embodiment of a vapor compression system  72  that can be used in any of the systems described above. The vapor compression system  72  may circulate a refrigerant through a circuit starting with a compressor  74 . The circuit may also include a condenser  76 , an expansion valve(s) or device(s)  78 , and an evaporator  80 . The vapor compression system  72  may further include a control panel  82  that has an analog to digital (A/D) converter  84 , a microprocessor  86 , a non-volatile memory  88 , and/or an interface board  90 . The control panel  82  and its components may function to regulate operation of the vapor compression system  72  based on feedback from an operator, from sensors of the vapor compression system  72  that detect operating conditions, and so forth. 
     In some embodiments, the vapor compression system  72  may use one or more of a variable speed drive (VSDs)  92 , a motor  94 , the compressor  74 , the condenser  76 , the expansion valve or device  78 , and/or the evaporator  80 . The motor  94  may drive the compressor  74  and may be powered by the variable speed drive (VSD)  92 . The VSD  92  receives alternating current (AC) power having a particular fixed line voltage and fixed line frequency from an AC power source, and provides power having a variable voltage and frequency to the motor  94 . In other embodiments, the motor  94  may be powered directly from an AC or direct current (DC) power source. The motor  94  may include any type of electric motor that can be powered by a VSD or directly from an AC or DC power source, such as a switched reluctance motor, an induction motor, an electronically commutated permanent magnet motor, or another suitable motor. 
     The compressor  74  compresses a refrigerant vapor and delivers the vapor to the condenser  76  through a discharge passage. In some embodiments, the compressor  74  may be a centrifugal compressor. The refrigerant vapor delivered by the compressor  74  to the condenser  76  may transfer heat to a fluid passing across the condenser  76 , such as ambient or environmental air  96 . The refrigerant vapor may condense to a refrigerant liquid in the condenser  76  as a result of thermal heat transfer with the environmental air  96 . The liquid refrigerant from the condenser  76  may flow through the expansion device  78  to the evaporator  80 . 
     The liquid refrigerant delivered to the evaporator  80  may absorb heat from another air stream, such as a supply air stream  98  provided to the building  10  or the residence  52 . For example, the supply air stream  98  may include ambient or environmental air, return air from a building, or a combination of the two. The liquid refrigerant in the evaporator  80  may undergo a phase change from the liquid refrigerant to a refrigerant vapor. In this manner, the evaporator  80  may reduce the temperature of the supply air stream  98  via thermal heat transfer with the refrigerant. Thereafter, the vapor refrigerant exits the evaporator  80  and returns to the compressor  74  by a suction line to complete the cycle. 
     In some embodiments, the vapor compression system  72  may further include a reheat coil in addition to the evaporator  80 . For example, the reheat coil may be positioned downstream of the evaporator relative to the supply air stream  98  and may reheat the supply air stream  98  when the supply air stream  98  is overcooled to remove humidity from the supply air stream  98  before the supply air stream  98  is directed to the building  10  or the residence  52 . 
     It should be appreciated that any of the features described herein may be incorporated with the HVAC unit  12 , the residential heating and cooling system  50 , or other HVAC systems. Additionally, while the features disclosed herein are described in the context of embodiments that directly heat and cool a supply air stream provided to a building or other load, embodiments of the present disclosure may be applicable to other HVAC systems as well. For example, the features described herein may be applied to mechanical cooling systems, free cooling systems, chiller systems, or other heat pump or refrigeration applications. 
     As discussed above, an HVAC system, such as the HVAC system of  FIGS. 1-4 , is configured to direct an air flow through an air flow path in the HVAC system. Additionally, a temperature and/or pressure controlled refrigerant may flow through a heat exchanger of the HVAC system that is disposed along the air flow path. The heat exchanger is configured to place, in certain operating modes, the air flow and the refrigerant in thermal communication with one another. For example, the heat exchanger includes tubes through which the refrigerant flows to enable heat exchange between the refrigerant and the air flow flowing across the heat exchanger. In on embodiment, the heat exchanger may be an evaporator configured to receive refrigerant and to cool the air flow passing thereover via heat exchange between the refrigerant and the air flow. A velocity of the air flow may decrease as the air flow is directed across the tubes. To increase the velocity of the air flow, in particular in operating modes in which the heat exchanger is not in heat exchange operation, the HVAC system may include a mount having fins configured to easily engage and disengage from the heat exchanger. For example, if the heat exchanger is an evaporator, the mount may be removable during a heating mode in which the evaporator is not in heat transfer operation, such that the evaporator does not substantially and unnecessarily reduce a pressure of the air flow. 
       FIG. 5  is a perspective view of an embodiment of an HVAC system  150 , which may be a packaged HVAC unit, having a heat exchanger with removable fins. The HVAC system  150  may include a housing  151  through which an air flow may be directed and conditioned. As illustrated in  FIG. 5 , the housing  151  includes a first volume  152 , a second volume  154 , a third volume  156 , and a fourth volume  158 . As will be appreciated, each volume  152 ,  154 ,  156 ,  158  may include a particular section within the housing  151  defined by structural members, such as panels, borders, frame members, and/or enclosures. Each volume  152 ,  154 ,  156 ,  158  may also include internal components of the HVAC system. In some embodiments, the internal components of different volumes  152 ,  154 ,  156 ,  158  are separated and/or isolated from one another. In  FIG. 5 , several of the structural members are substantially removed to illustrate the internal components within each of the volumes  152 ,  154 ,  156 ,  158 . 
     The first volume  152  includes a return air section  160  or inlet. An air flow, such as a return air flow from a conditioned space serviced by the HVAC system  150 , is configured to enter the housing  151  via the return air section  160  to begin circulation along an air flow path  161  of the HVAC system  150 . The HVAC system  150  may include a first partition  174  disposed in between the first volume  152  and the second volume  154  to block the air flow from traveling between the first volume  152  and the second volume  154 . Additionally, the HVAC system  150  may include a second partition  176  disposed between the third volume  156  and the fourth volume  158  to block the air flow from traveling between the third volume  156  and the fourth volume  158 . The first partition  174  and the second partition  176  may contain the air flow within the air flow path  161  such that the air flow is directed from the first volume  152  to the fourth volume  158  in both the heating mode and the cooling mode. 
     An evaporator  162  may define a boundary between the first volume  152  and the fourth volume  158 , and is configured to place the air flow in thermal communication with a refrigerant flowing through a header  163  and tubes  164  of the evaporator  162 . That is, the evaporator  162  may receive refrigerant via the header  163 , and may flow the refrigerant from the header  163  through the tubes  164  to exchange heat with the air flow passing over the tubes  164 . In some embodiments, the header  163  may be a manifold, or any suitable conduit configured to flow liquid, such as refrigerant, as described herein. In some embodiments, the header  163  may be a refrigerant inlet and outlet of the evaporator  162 . In some embodiments, the evaporator  162  may include two headers  163 , with one serving as a refrigerant inlet and one serving as a refrigerant outlet. In operation, the refrigerant flowing through the tubes  164  of the evaporator  162  may remove heat from the air flow passing across the evaporator  162 . As the refrigerant removes heat from the air flow, the refrigerant may be at least partially vaporized. Thus, the evaporator  162  may be in heat transfer operation during a cooling mode of the HVAC system  150 , for example during a summer season. As discussed herein, the tubes  164  of the evaporator may be microchannel tubes configured to flow refrigerant through microchannels extending within the tubes  164 . 
     The evaporator  162  is disposed within the air flow path  161 , thereby enabling the air flow to be directed across the evaporator  162  after entering the first volume  152 . In some embodiments, the HVAC system  150  includes a filter  166  positioned upstream of the evaporator  162  relative to the air flow path  161 . The filter  166  may remove particles from the air flow, such as dirt and other debris. The filter  166  may be any suitable structure configured to remove one or more particles or components from the air flow, such as a pleated filter, an electrostatic filter, a high-efficiency particulate air (HEPA) filter, or a fiber glass filter that traps the debris when the air flow passes through the filter  166 . 
     The evaporator  162  may at least partially separate the first volume  152  and the fourth volume  158 . As such, when the air flow is directed across the evaporator  162 , the air flow exits the first volume  152  and enters the fourth volume  158  of the HVAC system  150  along the air flow path  161 . The fourth volume  158  may include a supply air section  168  or outlet, which may be coupled to conditioned spaces serviced by the HVAC system  150 . For example, the supply air section  168  may be fluidly coupled to ducts of a building that receive the air flow exiting the HVAC system  150  via the supply section  168  and distribute the air flow to conditioned spaces within the building. 
     As mentioned above, the air flow may enter the HVAC system  150 , such as via the return air section  160 , at an initial velocity and may exit the HVAC system  150 , such as via the supply air section  168 , at a desired velocity. However, as the air flow is directed through the HVAC system  150 , the velocity of the air flow may decrease below the desired velocity. Thus, the HVAC system  150  may include a blower  170  configured to increase the velocity of the air flow and direct the air flow to exit the supply air section  168  at the desired velocity. 
     In some embodiments, a heat exchanger  172  is positioned downstream of the blower  170  in the air flow path  161 , and is configured to place the air flow in thermal communication with a fluid flowing through the heat exchanger  172 . For example, the heat exchanger  172  may place the air flow in thermal communication with a heated fluid, such as combustion products, to add heat to the air flow to increase a temperature of the air flow exiting the supply section  168 . Thus, the heat exchanger  172  may be configured to operate to heat the air flow in a heating mode of the HVAC system  150 , whereas the evaporator  162  may be configured to operate to cool the air flow in a cooling mode of the HVAC system  150 . Indeed, in some embodiments, while the HVAC system  150  is in the heating mode, the heat exchanger  172  may be operating, such as by placing the air flow in communication with a heated fluid, such as combustion products, and the heat exchanger  162  may not be in heat transfer operation. That is, during the heating mode, refrigerant may not be flowed through the heat exchanger  162  for heat transfer with an air flow passing over the heat exchanger  162 . 
     In certain embodiments, a controller  178  may determine the operating mode of the HVAC system  150 . For example, the controller  178  is disposed in the third volume  156  in the illustrated embodiment. The controller  178 , which may be substantially similar to the control panel  82 , may include a memory with stored instructions for operating the HVAC system  150 , including determining the operating mode for the HVAC system  150 . The controller  178  may also include a processor configured to execute such instructions. For example, the processor may include one or more application specific integrated circuits (ASICs), one or more field programmable gate arrays (FPGAs), one or more general purpose processors, or any combination thereof. Additionally, the memory may include volatile memory, such as random access memory (RAM), and/or non-volatile memory, such as read-only memory (ROM), optical drives, hard disc drives, or solid-state drives. Although  FIG. 5  illustrates the controller  178  disposed in the third volume  156 , in additional or alternative embodiments, the controller  178  may be disposed elsewhere in the HVAC system  150  and/or disposed externally to the HVAC system  150 . 
     The controller  178  may determine the operating mode of the HVAC system  150  based at least in part on a desired temperature for spaces to be conditioned and serviced by the HVAC system  150 . Based on the operating mode selected or determined, the controller  178  may suspend operation of certain components of the HVAC system  150  to conserve power to operate the HVAC system  150 . For example, if a desired temperature of the space is greater than a current temperature of the space, the controller  178  may determine that the HVAC system  150  should operate in a heating mode. The controller  178  may be configured to make this determination based on feedback, such as temperature data of the conditioned space and/or a conditioned space temperature setpoint. In the heating mode, the controller  178  may operate the heat exchanger  172  to heat the air flow, while suspending operation of the evaporator  162  that is configured to cool the air flow. If the desired temperature of the space is less than a current temperature of the space, the controller  178  may determine that the HVAC system  150  should operate in a cooling mode. In the cooling mode, the controller  178  may operate the evaporator  162  to cool the air flow, while suspending operation of the heat exchanger  172  that is configured to heat the fluid. 
     Moreover, as the air flow is directed through the air flow path  161 , the refrigerant may circulate through a refrigerant circuit  179  of the HVAC system  150 . For example, after the refrigerant absorbs heat from the air flow in the evaporator  162 , the heated refrigerant may be directed from the evaporator  162  disposed in the first volume  152  to a condenser  180  disposed in the second volume  154 . The refrigerant is cooled within the condenser  180  by air, such as ambient air, flowing across the condenser  180 . In some embodiments, the condenser  180  may use a fan or a group of fans to force air across the condenser  180  to remove heat from the refrigerant and reject the heat from the HVAC system  150 . After being cooled in the condenser  180 , the refrigerant may flow to the evaporator  162  again to continue to remove heat from the air flow, such as when the HVAC system  150  is operating in the cooling mode. As will be appreciated, the refrigerant circuit  179  may include a compressor and/or an expansion valve configured to change a pressure and/or a temperature of the refrigerant as the refrigerant is directed through the refrigerant circuit  179 . Adjusting the pressure and/or temperature of the refrigerant may increase/decrease the amount of heat exchanged between the air flow and the refrigerant within the evaporator  162  and/or the amount of heat removed from the refrigerant in the condenser  180 . In some embodiments, the compressor may discontinue operation, such as during the heating mode of the HVAC system  150 , such that refrigerant does not flow along the refrigerant circuit  179 . As will be appreciated, the HVAC system  150  may include other components operable to enable desired heat transfer to and from the air flow. In this manner, the HVAC system  150  may monitor and/or adjust characteristics or a quality of the air flow that is supplied to spaces conditioned by the HVAC system  150 . 
     As discussed herein, the evaporator  162  may be a microchannel evaporator heat exchanger having the tubes  164 , such as microchannel tubes, and the one or more headers  163  configured to flow refrigerant through the heat exchanger  162  to exchange heat with the airflow. The heat exchanger  162  may further include sections of fins  190 , such as thermal fins, that extend between the tubes  164 . In some embodiments, the fins  190 , a section of the fins  190 , a section of fin  190 , a fin section, a fins section, or a fin may be defined as a single, continuous, undulating strip of material having a relatively high heat transfer coefficient that is configured to extend between adjacent tubes  164 . That is, each adjacent pair of tubes  164  may include a single, continuous, undulating strip of fin, or fins  190 , having a relatively high heat transfer coefficient disposed therebetween in certain configurations. The fins  190  are configured to increase a rate of heat transfer between the airflow and refrigerant flowing through the tubes  164 . For example, the fins  190  may include a metal material having a relatively high heat transfer coefficient. 
     As discussed in further detail below, the fins  190  may be removable from the tubes  164  of the heat exchanger  162 . Particularly, as shown in the illustrated embodiment, the fins  190  may include multiple sets of fins  190  that span between the tubes  164 . In other words, the heat exchanger  162  may include sections or layers of fins  190  that are separated by the tubes  164 . As will be appreciated, the multiple sets of fins  190  may be coupled together across the tubes  164  by a mount or connecting structure such that the multiple sets of fins  190 , and corresponding mount or connecting structure, may be repositioned through manipulation of a single, substantially rigid structure. Once removed from the tubes  164 , the fins  190  may be mounted to one or more mounting locations  192  within or external to the HVAC system  150 . That is, the mounting location  192  may be disposed on a housing element of the housing  151 . 
     For example, in some embodiments, the mounting location  192  may be located external to the HVAC system  150  on an external wall  194  of the HVAC system  150 . In some embodiments, the mounting location  192  may be located internal to the HVAC system on the external wall  194 , such as within the first volume  152 . In some embodiments, the mounting location  192  may located on the first partition  174  within the first volume  152 . In some embodiments, the mounting location  192  may be located on a top wall, such as a roof, of the HVAC system  100 . It should be noted that the illustration of the top wall in the currently illustrated embodiment has been omitted to highlight features of the internal components of the HVAC system  100 . In some embodiments, the mounting location  192  may be located at any suitable location within or adjacent to the HVAC system  150  that provides easy and simple transference of the fins  190  from the currently illustrated position of the evaporator  162  to the mounting location  192 . Further, the mounting location  192  may include mounting elements, such as tabs, latches, mounts, ledges, or any other suitable structure configured to receive and support the fins  190 . 
     In some embodiments, the fins  190  may be coupled to a transfer mechanism  194  configured to transfer the fins  190  from the heat exchanger  162  to the mounting location  192 . The transfer mechanism  194  may include, for example, a motor or actuator communicatively coupled to the controller  178 . The controller  178  may send a transfer signal to the transfer mechanism  194 . Based on receipt of the transfer signal, the transfer mechanism  194  is configured to transfer the fins  190  to the mounting location  192  from the heat exchanger  162  or to the heat exchanger  162  from the mounting location  192 . In some embodiments, the controller  178  may send the transfer signal to adjust the position of the fins  190  depending on the operating mode of the HVAC system  150 . In some embodiments, the transfer mechanism  194  may include a manually actuated device, which may include pneumatic elements, for example. In such embodiments, the transfer mechanism  194  may be manually manipulated by a user or technician to move the fins  190  from the heat exchanger  162  to the mounting location  192 . In some embodiments, the transfer mechanism  194  may include a hinge  195 . That is, the fins  190  may be coupled to the hinge  195  and may be configured to rotate about the hinge  195  to transition to the mounting location  192 . 
     Keeping the description above in mind,  FIG. 6  is a perspective view of the evaporator microchannel heat exchanger  162  having the removable fins  190 . As mentioned above, the heat exchanger  162  may further include the one or more headers  163  and the tubes  164 , which may be referred to as a base  159  of the heat exchanger  162 . Generally, the headers  163  may serve as inlets and/or outlets for the refrigerant flowing through the heat exchanger  162  along the refrigerant circuit  179 , as seen in  FIG. 5 . Particularly, the headers  163  may route the refrigerant through microchannels extending through the tubes  164 . At the same time, an air flow  200  may be moved across the fins  190  of the heat exchanger  162 . Accordingly, the air flow  200  and the refrigerant may be placed in a heat exchange relationship, as discussed above. 
     As shown in the illustrated embodiment, the fins  190  may be disposed between the tubes  164 , such that sections of fins  190  are separated by the tubes  164 . In other words, the tubes  164  may be disposed between separate sections or layers of the fins  190 . As discussed herein, the separate sections of the fins  190  may be coupled together via plates of a mount  202 . That is, the mount  202  may include the fins  190  and the plates. In the currently illustrated embodiment of  FIG. 6 , the mount  202  is in an engaged mount configuration  201 , meaning that the mount  202  is engaged with the tubes  164  and/or the header  163  of the heat exchanger  162 . Indeed, the sections of fins  190 , or fin sections, may extend between the tubes  164  while the mount  202  is in the engaged mount configuration  201 . As discussed herein, the extension of the sections of fins  190  between the tubes  164  may be defined as the sections of the fins  190  directly contacting adjacent tubes  164  and/or indirectly contacting adjacent tubes  164  with a material, such as metal plates, disposed at interfaces between the adjacent tubes  164  and the sections of the fins  190 . While in the engaged mount configuration  201 , the fins  190  may be within the air flow path  161 . While the mount  202  is in the engaged mount configuration  201 , the fins  190  may enhance heat exchange, but may cause a pressure drop, or a decrease in velocity, of the air flow  200  as the air flow  200  moves across the fins  190  along the air flow path  161 . 
     Further, in some embodiments, the mount  202  may be in a disengaged mount configuration, such as when the mount  202  is separate or disengaged from the tubes  164  and/or the header  163  of the heat exchanger  162 . As discussed above, the mount  202  may be moved to the mounting location  192 , as seen in  FIG. 5 , while in the disengaged mount configuration. 
       FIG. 7  is a perspective view of the heat exchanger  162  having the mount  202  in a disengaged mount configuration  203 , such as disengaged from the heat exchanger base  159  formed by the tubes  164  and/or the header  163 . Indeed, the mount  202  may be defined as a structure configured to facilitate ready attachment to, and removal from, the base  159 . Indeed, the mount  202  may be coupled to, and decoupled from, the base  159  in a toolless manner. That is, the mount  202  may be transitioned between the engaged mount configuration  201  ( FIG. 6 ) and the disengaged mount configuration  202  without the use of tools, such as screw drivers, hammers, saws, welding equipment, and so forth. The mount  202  includes the fins  190  and a set of plates  204 . The fins  190  are coupled directly to the set of plates  204 , as shown. In some embodiments, the fins  190  may be welded or coupled in any other suitable manner to the plates  204 . The plates  204  may be formed from metal, such as pieces of sheet metal. In some embodiments, the fins  190  and the plates  204  may be formed of the same material. In this way, the plates  204  may be considered extensions of the fins  190 , or a part of the fins  190 . As such, the fins  190  may directly contact the tubes  164 . 
     The mount  202  is configured to engage with and disengage from the tubes  164  of the heat exchanger  162 . More specifically, in the illustrated embodiment, the plates  204  of the mount  202  are configured to engage with the tubes  164 . Indeed, as shown, a contour of an inner surface  206  of the plates  204  may substantially match a contour of an outer surface  208  of the tubes  164 . For example, in the currently illustrated embodiment, a top surface  210  and a bottom surface  212  of the outer surface  208  of the tubes  164  may be substantially flat, and the inner surface  206  of the plates may similarly include substantially flat portions. Further, as will be appreciated, in some embodiments, the top surface  210  and the bottom surface  212  of the tubes  164  may extend substantially parallel to each other, and the inner surface  206  of the plates  204  may similarly include portions that similarly extend substantially parallel to each other. Indeed, the substantially corresponding contours of the inner surface  206  of the plates  204  and the outer surface  208  of the tubes  164  may cause increased surface-to-surface contact between the plates  204  and the tubes  164 , which enhances conductive heat transfer between the fins  190  and the tubes  164 . 
     In the illustrated embodiment, the base  159  of the heat exchanger  162  includes five tubes  164 , and the mount  202  includes five plates  204 . However, it is to be understood that the base  159  of the heat exchanger  162  may include any suitable number of tubes  164 , and the mount  202  may include a corresponding suitable number of plates  204 . The mount  202  may include interior plates  214  and exterior plates  216 . Particularly, the mount  202  may include two exterior plates  216  and any suitable number of interior plates  214  disposed between the two exterior plates  216 . For example, in the currently illustrated embodiment, the mount  202  includes three interior plates  214 . The interior plates  214  may each be whole plates  220 . The whole plates  220  may be defined as plates  204  having the inner surface  206  configured to engage with both the top surface  210  and the bottom surface  212 , or a majority, of the outer surface  208  of the tubes  164 . In some embodiments, each of the whole plates  220  may be C-shaped to match or correspond to the contour of the outer surface of the tubes  164 . In some embodiments, the plates  204  may be flexible, such that the plates  204  may apply a pressure to the tubes  164  when coupled to the base  159 . Indeed, in such embodiments, the C-shaped formation of the plates  204  may be configured to bend or elastically deform, similar to mechanics of a money clip, in order to couple to the tubes  164 . 
     Further, the exterior plates  216  may be whole plates  220  and/or partial plates  222 . For example, as shown in the currently illustrated embodiment, the exterior plates  216  include one whole plate  220  and one partial plate  222 . That is, the upper exterior plate  216  is a partial plate  222  and the lower exterior plate  216  is a whole plate  220 . Partial plates  222  may be defined as plates  204  configured to contact only half or less than half of the outer surface  208  of the tubes  164 . For example, as shown, the partial plate  222  may include a substantially flat piece of material, such as sheet metal, which may be configured to contact one of either the top surface  210  or the bottom surface  212  of a respective tube  164 . 
     The tubes  164  may include a tube length  230 . The tube length  230  may be defined by a distance that the tube  164  spans between the headers  163  in the illustrated embodiment. Similarly, the plates  204  of the mount  202  may include a plate length  232 . Particularly, the plate length  230  may be defined by a distance that each plate  204  spans between a first side  234  of the mount  202  and a second side  236  of the mount  202 . The fins  190  may similarly extend the plate length  230  along the plates  204 . The tube length  230  and the plate length  232  may be substantially equal. In this manner, the fins  190  may span along substantially the entirety of the tubes  164  to promote heat transfer in the engaged configuration. 
     Keeping this in mind,  FIGS. 8-11  are perspective views of embodiments of an end  241  of one of the plates  204  of the mount  202 . That is, the end  241  may be disposed at the first side  234  or the second side  236  of the mount  202 . Each of the plates  204  shown in  FIGS. 8-11  may be illustrated as whole plates  220 , as discussed above with respect to  FIG. 7 . However, it is to be understood that features of the embodiments discussed in reference to  FIGS. 8-11  may also be included in the partial plates  222  of the mount  202  illustrated in  FIG. 7 . 
     As shown in  FIG. 8 , the plate  204  may include a first side portion  242 , a second side portion  244 , and a connecting portion  246 . The first side portion  242  and the second side portion  244  may both extend substantially parallel to each other from edges of the connecting portion  246 . That is, the first side portion  244  and the second side portion  246  may both be substantially flat and maintain a substantially constant spacing between each other. However, as mentioned above, the shape of the plate  204  may substantially match or correspond to the shape of the tubes  164 . Thus, it should be understood that the shape of the first side portion  244  and the second side portion  246  may be based on the shape of the tubes  164  and may not necessarily be substantially flat and/or parallel in some embodiments. The connecting portion  246  may be curved to match or correspond to a curvature of the tubes  164 . The curved surface of the connecting portion  246  may be positioned to face against the direction of the air flow path, such that connecting portion  246  aerodynamically distributes the air flow across the fins  190 . The first portion  242 , the second portion  244 , and the connecting portion  246  collectively define a C-shaped configuration of the plate  204 . 
     In some embodiments, the inner surface  206  of the plate  204  may include a heat transfer promotion layer  250 . The heat transfer promotion layer  250  is configured to contact the tubes  164  to promote heat transfer between the plates  204  and the tubes  164  in the engaged mount configuration  201 . The heat transfer promotion layer  250  may include a thermal interface compound, such as thermal paste, thermal grease, a thermal pad, or other suitable material configured to promote heat transfer. 
     In some embodiments, as shown in  FIG. 9 , the plates  204  may include a coupling component  252  configured to couple to a corresponding component of the tubes  164 . For example, in some embodiments, the coupling component  252  may include one or more concavities, or dimples, configured to engage with one or more convexities, or protrusions, of the tubes  164 . Conversely, in some embodiments, the coupling component  252  may include one or more convexities, or protrusions, configured to engage with one or more concavities, or dimples, of the tubes  164 . In the currently illustrate embodiment, the end  241  of the plate  204  may include two coupling components  252  on each of the first side portion  242  and the second side portion  244 . However, it is to be understood that the plate  204  may include any suitable number of coupling components  252  disposed at any suitable positions along the plate  204 . In some embodiments, the coupling components  252  may include beads, latches, notches, snap-fits joints, clips, protrusions, or any other suitable element configured to cause the mount  202  and the headers  163  and/or tubes  164  to couple to each other in the engaged mount configuration  201 . 
     In some embodiments, as shown in  FIG. 10 , the connecting portion  246  of the plate  204  may include one or more gaps or apertures  254  disposed along the plate length  230 . That is, the connecting portion  246  may include sections of material with the apertures  254  disposed between the sections of material. The apertures  254  disposed along the connecting portion  246  allow for a portion of the air flow moving along the air flow path  161  to directly contact portions the tubes  164  disposed within the plates  204  to increase heat transfer. Manufacturing the plates  204  with the apertures  254  may also reduce material costs. 
     Further, in some embodiments, as shown in  FIG. 11 , the plate  204  may be formed of a mesh structure  256 , such as a woven metal material. The mesh structure  256  may be air permeable such that the air flow moving along the air flow path  161  may directly contact portions of the tubes  164  disposed within the plates  204  to increase heat transfer. Further, manufacturing the plates  204  with the mesh structure  256  may reduce material costs. 
       FIG. 12  is a perspective view of an embodiment of the mount  202  having a support structure  260  coupled to the plates  204 . The support structure  260  is configured to provide support and rigidity to the mount  202 . For example, the support structure  260  may include one or more rods  262  coupled to the plates  204 . In the currently illustrated embodiment, the support structure  260  includes five rods  262  coupled directly to a portion or all of the plates  204 . However, the support structure  260  may include any suitable number of rods  262  coupled to the plates  204 . In some embodiments, the rods  262  may be welded, brazed, or coupled in any suitable manner to the plates  204 . Specifically, as shown, the rods  262  are coupled to the connecting portion  246  of the plates  204 . In some embodiments, the rods  262  may be additionally or alternatively coupled to the fins  190 . 
       FIG. 13  is a perspective schematic view of the mount  202  having one or more brackets  270  coupled to each of the sections of fins  190 . In the currently illustrated embodiments, the sections of fins  190  may be coupled to the plates  204 . That is, respective sections of fins  190  may be coupled to pairs of the partial plates  222 , which are further coupled to the bracket  270 . However, in some embodiments, each section of fins  190  may be disposed between whole plates  220 , with the connecting portion  246  of the whole plates  220  directly coupled to the bracket  270 . 
     The currently illustrated embodiment of the mount  202  may be utilized in an embodiment of the heat exchanger  162  having only one header  163 . Indeed, the mount  202  may be coupled to the heat exchanger  162  such that the bracket  270  is disposed on an opposite side of the header  163 . In other words, the first side  234  of the mount  270  may be disposed adjacent to the header  163  at a first end of the tubes  164  and the second side  236  of the mount  270 , which includes the bracket  270 , may be disposed opposite to the header  163  at a second end of the tubes  164 . 
       FIG. 14  is a cross-sectional schematic view of an embodiment of one the tubes  164  of the heat exchanger  162  having microchannels  300  disposed therethrough. In the illustrated embodiment, the tube  164  is coupled to one of the plates  204 . Further, in the illustrated embodiment, a space or gap is shown as disposed between the tube  164  and the plate  204 . However, the schematic illustrations of  FIG. 14  are simplified for clarity of certain aspects, and it should be understood that that there may not actually be a space or gap disposed between the tube  164  and the plate  204  in some embodiments. That is, as mentioned above, the plates  204  and the tubes  164  may include a substantially flush interface. 
     As mentioned above, the microchannels  300  are configured to extend within the tube  164  along a length of the tube  164 . Further, as discussed above, the tube  164  includes the outer surface  208  configured to engage with the inner surface  206  of the plates  204 . Particularly, the outer surface  208  of the tube  164  includes the top surface  210  and the bottom surface  212 , which may be substantially flat and parallel relative to each other. The top surface  210  and the bottom surface  212  may be substantially matching in shape to the first and second side portions  242 ,  244  of the plate  204 . The tube  164  further includes edge surfaces  302 . The edge surfaces  302  may be substantially matching in shape or contour to the inner surface  206  of the connecting portion  246  of the plate  204 . For example, the edge surface  302  may be rounded to substantially match the C-shape provided by the connecting portion  246  of the plate  204 . 
     The present disclosure is directed to a heat exchanger of an HVAC system having removable fins. For example, the HVAC system may be configured to move an air flow along an air flow path. The heat exchanger is disposed within the air flow path. In a first operating mode of the HVAC system, the fins of the heat exchanger may be utilized to exchange heat between the air flow and a refrigerant flowing through the heat exchanger. However, in a second operating mode of the HVAC system, the heat exchanger may not be utilized. Accordingly, to reduce pressure drops and increase velocity of the air flow moving along the air flow path in the second operating mode, the fins may be removed from the heat exchanger. 
     The fins may be coupled to a mount. The mount is configured to be engaged with the heat exchanger in an engaged mount configuration such that the fins are disposed between tubes of the heat exchanger. The mount is also configured to be disengaged from the heat exchanger in a disengaged mount configuration such that the fins are separate from the tubes of the heat exchanger. In this manner, the fins may easily be removed from the heat exchanger to decrease pressure losses and increase velocity of the air flow moving along the air flow path. 
     While only certain features and embodiments of the present disclosure have been illustrated and described, many modifications and changes may occur to those skilled in the art, such as variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, such as temperatures or pressures, mounting arrangements, use of materials, colors, orientations, and so forth, without materially departing from the novel teachings and advantages of the subject matter recited in the claims. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the present disclosure. Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not have been described, such as those unrelated to the presently contemplated best mode of carrying out the present disclosure, or those unrelated to enabling the claimed embodiments. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.