Patent ID: 12253280

In Figs., First cooling device10, first cooling end11, first heating end12, first end13, second end14Dehumidifying rotary20, first section21, second section22Air flow switching device30, first conduit31, second conduit32, first valve33, second valve34First heat exchanger40First energy switching device50, fourth conduit51, fifth conduit52, fourth valve53, fifth valve54Second cooling device60, second cooling end61, second heating end62Second heat exchanger70, third conduit71, third valve72Second heat switching device80, sixth conduit81, seventh conduit82, sixth valve83, seventh valve84First blower91, second blower92Heater100Filter110

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

For more clearly illustrating the present invention, the following provides a more complete description of the present invention with reference to related drawings and preferred embodiments. In addition, new embodiments can be derived and embodied through a combination of different embodiments or techniques disclosed therein.

Embodiment 1

Referring toFIG.1, a fresh air conditioning system made in accordance with a first embodiment of the invention includes a first cooling device10, a dehumidifying rotary20, an airflow switching device30, a first heat exchanger40and a first energy switching device50.

The first cooling device10can be a thermoelectric cooler, and includes a first cooling end11, and a first heating end12.

The dehumidifying rotary20defines a first section21and a second section22. When the first section21of the dehumidifying rotary20works as a processing zone, then the second section22of the dehumidifying rotary20works as a regenerating zone, and when the first section21of the dehumidifying rotary20works as the regenerating zone, then the second section22of the dehumidifying rotary20works as the processing zone.

The airflow switching device30is connected to the first cooling device10and selectively diverting a fresh airflow from a first space to the first cooling end11or the first heating end12of the first cooling device10. The first space, for example, is a space of outdoors or a designated space. When the airflow switching device30diverts the fresh airflow from the first space to the first cooling end11of the first cooling device10, the fresh airflow from the first space conducts heat exchange with the first cooling end11of the first cooling device10so as to decrease the temperature of the fresh airflow from the first space. When the airflow switching device30diverts the fresh airflow from the first space to the first heating end12of the first cooling device10, the airflow from the first space conducts heat exchange with the first heating end12of the first cooling device10so as to increase the temperature of the fresh airflow from the first space.

According to one specific embodiment, the airflow switching device30includes a first conduit31and a second conduit32. The first conduit31is connected to the second heating end12of the first cooling device10, and equipped with a first valve33, such as a solenoid, to control open-shutoff of the first conduit31. The second conduit32is connected to the first cooling end11of the first cooling device10, and is equipped with a second valve34, such as a solenoid, to control open-shutoff of the second conduit32. When the first valve33is open, and the second valve34is shutoff, then the airflow switching device30will divert the fresh airflow from the first space to the first heating end12of the first cooling device10. While when the first valve33is shutoff, and the second valve34is open, then the airflow switching device30will divert the fresh airflow from the first space to the first cooling end11of the first cooling device10. By this arrangement, switch of direction of the fresh airflow can be readily achieved.

In some other embodiments, the airflow switching device30can be embodied in other forms, for example, the airflow switching device30includes a switching valve connected to the first conduit31, and the second conduit32, respectively. The switching valve can guide the fresh airflow to the first conduit31, or the second conduit32so as to switch the airflow.

The first heat exchanger40is connected to the second section22of the dehumidifying rotary20so as to conduct heat exchange with a return airflow from a second space. The first heat exchanger40may include a ventilated plenum chamber which includes a three-pass configuration, i.e. a primary airway, and an auxiliary airway. The primary airway is used for the fresh airflow or the return airflow, while the auxiliary airway is a fourth conduit51or a fifth conduit52for influx of heat exchanged airflow from the first cooling device10or the second cooling device60. The heat exchanged airflow conducts heat exchange with the fresh airflow or the return airflow within the primary airway.

The first energy switching device50is arranged between the first cooling device10and the first heat exchanger40to selectively transfer energy from the first cooling end11or the first heating end12to the first heat exchanger40.

The first energy switching device50further includes the fourth conduit51and the fifth conduit52. The fourth conduit51is arranged between the first heating end12of the first cooling device10and the first heat exchanger40. The fourth conduit51is equipped with a fourth valve53, typically a solenoid, to control open-shutoff of the fourth conduit51. The fifth conduit52is arranged between the first cooling end11of the first cooling device10and the first heat exchanger40. The fifth conduit52is equipped with a fifth valve54, typically a solenoid, to control open-shutoff of the fifth conduit52. When the fourth valve53is open and the fifth valve54is shutoff, the first energy switching device50will transfer energy from the first heating end12of the first cooling device10to the first heat exchanger40. When the fourth valve53is shutoff and the fifth valve54is open, the first energy switching device50will transfer energy from the first cooling end11of the first cooling device10to the first heat exchanger40. By this arrangement, energy from the first cooling end11or the first heating end12of the first cooling device10can be directed to the first heat exchanger40. In other preferred embodiments, the first energy switching device50can be configured with a switching valve and conduits so as to achieve the purpose. It can have a similar configuration of the airflow switching device30. As a result, no detailed description is given herein.

After the fresh airflow from the first space completes heat exchange with the first cooling end11or the first heating end12of the first cooling device10, the fresh airflow flows to the second space through the first section21of the dehumidifying rotary20, and the return airflow will conduct heat exchange with the first heat exchanger40, and then exhaust through the second section22of the dehumidifying rotary20.

According to the preferred embodiment, the fresh air conditioning system further comprises a first blower91, a second blower92, a heater100and a filter110.

The first blower91is connected to the first section21of the dehumidifying rotary20in order to blow out the fresh airflow to the second space.

The second blower92is connected to the second section22of the dehumidifying rotary20in order to discharge the return airflow out from the second section22of the dehumidifying rotary20.

The heater100is connected to second section22of the dehumidifying rotary20and the first heat exchanger40. After the return airflow from the second space completes heat exchange with the first heat exchanger40, the return airflow is heated by the heater100and then flow to the second section22of the dehumidifying rotary20. The heater100is used to warm up the return airflow so as to keep efficiency of the dehumidifying rotary20steady, avoid reducing a regenerating/restoring efficiency of the dehumidifying rotary20which could reduce the overall efficiency of the fresh air conditioning system.

The filter110is connected to the airflow switching device30. The fresh airflow from the first space is filtered by the filter110and then flows to the airflow switching device30.

Operational procedures of the fresh air conditioning system during the summer and winter time will be disclosed as follow.

It should be noted that since the working principles of dehumidifying and humidifying, the working principle of the present invention has been detailedly given, as a result, no detailed description is given herebelow.

During the summer time, the fresh air conditioning system performs a dehumidifying process and temperature control to the fresh airflow. When the first cooling device10starts to operate, the first valve33of the airflow switching device30is shutoff, while the second valve34is open. As a result, the fresh airflow from the first space flows through the second conduit32to the first cooling end11of the first cooling device10. Afterward, the fresh airflow flows to the first section21of the dehumidifying rotary20. In this situation, the first section21of the dehumidifying rotary20is a processing zone to perform dehumidifying and cooling processes. Meanwhile, the fourth valve53of the first energy switching device50is open, and the fifth valve54is shutoff, then energy from the first heating end12of the first cooling device10is controlled to transfer to the first heat exchanger40. The temperature of the return airflow from the second space is warm up after completes heat exchange with the first heat exchanger40, and then flows to the second section22of the dehumidifying rotary20. In this situation, the second section22of the dehumidifying rotary20is a regenerating zone, and the heated return airflow will take away humidity within the dehumidifying rotary20, and then exit the system.

During the winter time, the fresh air conditioning system will warm up and humidify the fresh airflow from the first space. In this situation, the first valve33is open, the second valve34is shutoff, and the airflow from the first space flows to the first heating end12of the first cooling device10. After the fresh airflow completes heat exchange with the first heating end12of the first cooling device10and warm up, the fresh airflow will flow through the first section21of the dehumidifying rotary20. In this situation, the first section21of the dehumidifying rotary20functions as a regenerating zone to warm up and humidify the fresh airflow from the first space. The fourth valve53of the first energy switching device50is shutoff, the fifth valve54is open, transferring energy from the first cooling end11of the first cooling device10to the first heat exchanger40. After the return airflow from the second space completes heat exchange with the first heat exchange40and reduces its temperature, the return airflow flows to the second section22of the dehumidifying rotary20. In this situation, the second section22of the dehumidifying rotary20functions as a processing zone. The temperature of the return airflow is close to dew point after it is cooling down. After humidity contained within the return airflow is absorbed by the dehumidifying rotary40, the return airflow exits the system.

During the operation and functioning of the fresh air conditioning system made in accordance with the present invention, while the energy from one end of the first cooling device10is effectively utilized by the fresh airflow, the return airflow also effectively utilizes the energy from the other end of the first cooling device10. As such, energy from both ends of the first cooling device10is effectively utilized. By this arrangement, energy is preferably conserved without any unwanted waste.

Embodiment 2

Referring toFIG.2, a fresh air conditioning system made in accordance with a second embodiment of the invention, which is based on the first embodiment, further includes a second cooling device60, a second heat exchanger70, and a second energy switching device80.

The second cooling device60includes a second cooling end61and a second heating end62. The second cooling end61of the second cooling device60is connected to the first section21of the dehumidifying rotary20. The fresh airflow from the first space flows first through the first section21of the dehumidifying rotary20, and then conducts heat exchange with the second cooling end61of the second cooling device60. Eventually, the fresh airflow flows to the second space.

The second heat exchanger70is connected to the first heating end12of the first cooling device10, the second heating end62of the second cooling device60, and the first section21of the dehumidifying rotary20. After the fresh airflow from the first space conducts heat exchange with the first heating end12of the first cooling device10, and the fresh airflow further conducts heat exchange with the second heat exchanger70, and then flows to the first section21of the dehumidifying rotary20. The second heat exchanger70may include a ventilated plenum chamber. The ventilated plenum chamber is a three-pass configuration including a primary airway and an auxiliary airway. The fresh airflow flows through the primary airway, and the auxiliary airway is a sixth conduit81for influx of airflow from the second cooling device60. The airflow from the second cooling device60mixes thoroughly with the fresh airflow or the return airflow and conducts heat exchange with them.

The second energy switching device80is connected to the second heating end62of the second cooling device60, the first heat changer40and the second heat exchanger70. The second energy switching device80is configured to selectively transfer energy from the second heating end62of the second cooling device60to the first heat exchanger40or the second heat exchanger70.

The second energy switching device80may include a sixth conduit81arranged between the second heating end62of the second cooling device60and the second heat exchanger70. The sixth conduit81is equipped with a sixth valve83, which can be a solenoid. The second energy switching device80further includes a seventh conduit82arranged between the second heating end62of the second cooling device60and the first heat exchanger40. The seventh conduit82is equipped with a seventh valve84, which is for example a solenoid. When the sixth valve83is open, the seventh valve84is shutoff, the second energy switching device80will transfer energy from the second heating end62of the second cooling device60to the second heat exchanger70. When the sixth valve83is shutoff, the seventh valve84is open, the second energy switching device80will transfer energy from the second heating end62of the second cooling device60to the first heat exchanger40. By this arrangement, energy from the second heating end62of the second cooling device60can be selectively transferred to the first heat exchanger40or the second heat exchanger70. In other embodiment, the second energy switching device80can be configured with a switching valve and conduits which have identical or similar configuration as the airflow switching device30. As a result, no detailed description is given herein.

The second heat exchanger70is connected to the first section21of the dehumidifying rotary20through a third conduit71which is equipped with a third valve72, typically a solenoid. The third valve72is configured to control the open and shutoff of the third conduit71.

Operational procedures of the fresh air conditioning system during the summer and winter time will be disclosed as follow.

During the summer time, the fresh air conditioning system will perform temperature control and dehumidifying the fresh airflow. The first cooling device10and the second cooling device60start to operate, and the first valve33is shutoff, the second valve34is open, and the third valve72is also shutoff. In this case, the fresh airflow from the first space flow to the first cooling end11of the first cooling device10via the second conduit32, then flows to the first section21of the dehumidifying rotary20. The fresh airflow keeps flowing to the second cooling end61of the second cooling device60for secondary cooling. The first section21of the dehumidifying rotary20serves as a processing zone. Accordingly, the temperature of the fresh airflow is lowered, and the humidity is removed. This is for the summer time. The fourth valve53of the first energy switching device50is open, the fifth valve54is shutoff. With this setting, energy from the first heating end12of the first cooling device10is directed to the first heat exchanger40. The sixth valve83is shutoff, the seventh valve84is open, the first heat exchanger40conducts heat exchange with the second heating end62of the second cooling device60through the conduit82. The return airflow from the second space is warm up after heat exchange with the first heat exchanger40. The return airflow passes through the heater100and warm up again. The return airflow flows to the second section22of the dehumidifying rotary20. In this setting, the second section22of the dehumidifying rotary20acts as a regenerating zone, and the return airflow is blown out after the heated return airflow absorbs humidity within the dehumidifying rotary20.

During the winter time, the fresh air conditioning system will perform temperature control and humidifying the fresh airflow. The first cooling device10and the second cooling device60start to operate, while the heater100can be remained off. The first valve33of the airflow switching device30is open, the second valve34is shutoff, the third valve72is open, the sixth valve83is open and the seventh valve84is shutoff. The energy from the second heating end62of the second cooling device60is transferred to the second heat exchanger70through the sixth conduit81. The fresh airflow from the first space flows to the first heating end12of the first cooling device10through the first conduit31. The fresh airflow keeps flowing to the second heat exchanger70for further warm up, and then flows to the first section21of the dehumidifying rotary20through the third conduit71. Then the fresh airflow flows to the second cooling end61of the second cooling device60to cool down. In this setting, the first section21of the dehumidifying rotary20acts as a processing zone, and the function of temperature control and humidifying the fresh airflow in the winter is realized. The fourth valve53of the first heat exchanger50is shutoff, the fifth valve54is open so as to conduct heat exchange between the first cooling end11of the first cooling device10and the first heat exchanger40. The return airflow conducts heat exchange with the first heat exchanger40and cools down. The return airflow keeps on flowing to the second section22of the dehumidifying rotary20. In this case, the second section22of the dehumidifying rotary20acts as a processing zone. The dehumidifying rotary20absorbs moisture contained in the return airflow, and then the return airflow is blown out.

During the operation of the fresh air conditioning system made in accordance with the preferred embodiment of the present invention, in dehumidifying the fresh airflow, the fresh airflow utilizes energy from the first cooling end11of the first cooling device10, and energy from the second end61of the second cooling device60, while the return airflow utilizes energy from the second heating end12of the first cooling device10and energy from the second heating end62of the second cooling device60. In humidifying the fresh airflow, the fresh airflow utilizes energy from the first heating end12of the first cooling device10, and energy from the second heating end62from the second cooling device60. After the fresh airflow passes through the dehumidifying rotary20, the fresh airflow utilizes energy from the second cooling end61of the second cooling device60to cool down, while the return airflow utilizes energy from the first cooling end11of the first cooling device10. By this arrangement, energy from both ends of the first cooling device10and the second cooling device60has been effectively utilized, avoid waste of energy while conserving precious energy.

Embodiment 3

A fresh air conditioning system made in accordance with a third embodiment of the invention includes a first cooling device10, a dehumidifying rotary20, a first heat exchanger40and a fourth conduit51.

The first cooling device10includes a first end13and a second end14. When the first end13of the first cooling device10functions to cool, then the second end14of the first cooling device10functions to heat; when the first end13of the first cooling device10functions to heat, then the second end14of the first cooling device10functions to cool. Preferably, the first cooling device10is made of a thermoelectric cooler. Further preferably, the first cooling device10includes a positive electrode and a negative electrode. When the positive and negative electrodes are supplied with power, the first end13of the first cooling device10functions to cool, and the second end14of the first cooling device10functions to heat. When the power supplied to the first and second electrodes is reversed, then the first end13of the first cooling device10functions to heat, and the second end14of the first cooling device10functions to cool.

The dehumidifying rotary20defines a first section21and a second section22. Wherein when the first section21of the dehumidifying rotary20works as a processing zone, then the second section22of the dehumidifying rotary20works as a regenerating zone, wherein when the first section21of the dehumidifying rotary20works as the regenerating zone, then the second section22of the dehumidifying rotary20works as the processing zone. The processing zone is a zone in which the dehumidifying rotary20absorbs moisture, and the regenerating zone is a zone in which the dehumidifying rotary20losses moisture.

The first heat exchanger40is connected to the section22of the dehumidifying rotary20, and is used to conduct heat exchange with return airflow from the second space. Energy from the second end14of the first cooling device10is directed to the first heat exchanger40through a fourth conduit51. The first heat exchanger40includes a ventilated plenum chamber which is a three-pass configuration which includes a primary airway and an auxiliary airway. The primary airway is used for a passage of the fresh airflow or return airflow and the auxiliary airway is the fourth conduit51for introducing of airflow from the first cooling device10. The heat exchanged airflow from the first cooling device10mixes thoroughly with the fresh airflow or return airflow within the primary airway to conduct heat exchange.

The fresh air conditioning system made accordance with the present invention further includes a first blower91, a second blower92, a heater100and a filter110. The arrangement and positions of the first blower91, and the second blower92, the heater100, and the filter110can be identical or similar to those described in the first embodiment. As a result, no detailed description is given herein.

Operational procedures of the fresh air conditioning system during the summer and winter time will be disclosed as follow.

During the summer time, the fresh air conditioning system will perform temperature control and dehumidifying the fresh airflow. The first end13of the first cooling device10functions to cool down. The fresh airflow from the first space conducts heat exchange with the first end13of the first cooling device10after the fresh airflow is filtered by the filter100. The temperature of the fresh airflow is lowered approximately to dew point, and then flows through the first section21of the dehumidifying rotary20and then into the second space. In this case, the first section21of the dehumidifying rotary20acts a processing zone; and the second section22of the dehumidifying rotary20acts as a regenerating zone. By this arrangement, the fresh airflow is cooled down and dehumidified during the summer time. The second end14of the first cooling device10functions to heat, and energy therefrom is directed to the first heat exchanger40through the fourth conduit51. The temperature of the return airflow from the second space is warm up after the return airflow conducts heat exchange with the first heat exchanger40. The return airflow is warm up further by the heater100, and then flows to the second section22of the dehumidifying rotary20. In this case, the second section22of the dehumidifying rotary20acts as the regenerating zone, and the return airflow absorbs moisture within the dehumidifying rotary20and then is blown out.

During the winter time, the fresh airflow is treated to warm up and humidify with moisture. The first end13of the first cooling device10functions to heat. The fresh airflow from the first space is warm up after the fresh airflow conducts heat exchange with the first end13of the cooling device10. The fresh airflow then flows to the first section21of the dehumidifying rotary20. In this case, the first section21of the dehumidifying rotary20acts as a regenerating zone. The heated and humidified fresh airflow flows into the second space. As a result, fresh airflow is warm up and humidified during the winter time. The second end14of the cooling device10functions to cool, and energy therefrom conducts heat exchange with the first heat exchanger40through the fourth conduit51. In this case, the heater100remained off. The return airflow from the second space is cooled down after conducting heat exchange with the first heat exchanger40, and then flows to the second section22of the dehumidifying rotary20. Here, the second section22of the dehumidifying rotary20acts as a processing zone. The temperature of the return airflow closes approximately to dew point after the return airflow is cooled down and moisture contained therein is absorbed by the dehumidifying rotary20. The return airflow is then blown out.

During the operation of the fresh air conditioning system, no matter it functions as dehumidifying or humidifying, while the fresh airflow utilizes energy from the first end13of the first cooling device10, the return airflow utilizes energy from the second end14of the first cooling device. As a result, energy from both ends of the first cooling device10is effectively utilized for intended purposes. Energy is avoided from wasting, but effectively preserved. Compared to the first embodiment of the fresh air conditioning system, the third embodiment is configurationally simplified, and the conduits can be easily connected and arranged.

Embodiment 4

A fresh air conditioning system made in accordance with a fourth embodiment of the invention, which is based on the first embodiment, further includes a second cooling device60, a second heat exchanger70, and a second energy switching device80.

The second cooling device60includes a second cooling end61which is connected to the first section21of the dehumidifying rotary20and a second heating end62. The fresh airflow from the first space conducts heat exchange with the second cooling end61of the second cooling device60after the fresh airflow passes through the first section21of the dehumidifying rotary20, and then flows to the second space. Preferably, the second cooling device60is a thermoelectric cooling device.

The second heat exchanger70is connected to the first end13of the first cooling device10, the second heating end62of the second cooling device60, and the first section21of the dehumidifying rotary20. After the fresh airflow conducts heat exchange with the first end13of the first cooling device10, the fresh airflow further conducts heat exchange with the second heat exchanger70, after that, the fresh airflow flows to the first section21of the dehumidifying rotary20. The second heat exchanger70may include a ventilated plenum chamber. The ventilated plenum chamber is a three-pass configuration including a primary airway and an auxiliary airway. The fresh airflow flows through the primary airway, and the auxiliary airway is a sixth conduit81for influx of heat exchanged airflow from the first cooling device10or the second cooling device60. The heat exchanged airflow mixes thoroughly with the fresh airflow and conducts heat exchange with them.

The second energy switch device80is connected to the second heating end62of the second cooling device60, the first heat exchanger40, and the second heat exchanger70and is used to selectively direct energy from the second heating end62of the second cooling device60to the first heat exchanger40or the second heat exchanger70. The second energy switching device80includes the sixth conduit81and a seventh conduit82. The sixth conduit81is arranged between the second heating end62of the second cooling device60, and the second heat exchanger70. The sixth conduit81is equipped with a sixth valve83. The seventh conduit82is arranged between the second heating end62of the second cooling device60and the first heat exchanger40. The seventh conduit82is equipped with a seventh valve84. The second energy switching device80of this embodiment can be identical or similar to the second energy switching device80of the second embodiment. Thus, no detailed description is given herein.

The fresh air conditioning system made in accordance with the present invention further includes a first blower91, a second blower92, a heater100, and a filter110. The filter110is connected to the first end13of the first cooling device10. The arrangements and the positions of the first blower91, the second blower92, the heater100and the filter110are similar or identical to the second embodiment. As a result, no detailed description is given herein.

Operational procedures of the fresh air conditioning system during the summer and winter time will be disclosed as follow.

During the summer time, the fresh air conditioning system will perform temperature control and dehumidifying the fresh airflow. The first end13of the first cooling device10functions to cool, the temperature of the fresh airflow from the first space is lowered after the fresh airflow from the first space conducts heat exchange with the first end13of the first cooling device10. The temperature of the fresh airflow is close to the dew point. Then the fresh airflow flows to the first section21of the dehumidifying rotary20. In this case, the first section21of the dehumidifying rotary20acts as the processing zone. As a result, the fresh airflow becomes drier and then conducts heat exchange with the second cooling end61of the second cooling device60, and then flows to the second space. As a result, the intended purpose of the present invention for the summer time, providing cool and drier fresh airflow is achieved. The second end14of the first cooling device10heats up, and energy from the second end14of the first cooling device10is directed to the first heat exchanger40. The sixth valve83of the second energy switching device80is shutoff, and the seventh valve84is open, and energy from the second heating end62of the second cooling device60is transferred to the first heat exchanger40through the seventh conduit82. The temperature of the return airflow from the second space is warm up, and then flows to the second section22of the dehumidifying rotary20. In this case, the second section22of the dehumidifying rotary20acts as the regenerating zone, and the heated return airflow absorbs moisture within the dehumidifying rotary20, and then is blown out.

During the winter time, the fresh airflow will perform temperature control and humidifying the fresh airflow. The first end13of the first cooling device10heats up, the sixth valve83of the second energy switching device60open, the seventh valve84is shutoff, energy from the second heating end62of the second cooling device60will be transferred to the second heat exchanger70through the sixth conduit81. The fresh airflow conducts heat exchange with the first end13of the first cooling device10which warms the fresh airflow. Afterward, the fresh airflow is warmed again when it conducts heat exchange with the second heat exchanger70. Then the fresh airflow flows to the first section21of the dehumidifying rotary20. In this case, the first section21of the dehumidifying rotary20acts as the regenerating zone, and the moisture contained therein is absorbed by the heated fresh airflow. Now, the heated and wetted fresh airflow flows to the second cooling end61of the second cooling device60, conducting heat exchange therewith, and eventually enters the second space. By this arrangement, the intended purposes for the winter time, heating and wetting, are properly achieved. The second14of the first cooling device10cools, and conducts heat exchange with the first heat exchanger40through the fourth conduit51. The temperature of the return airflow from the second space is cooled down after the return airflow conducts heat exchange with the heat exchanger40, and the return airflow keeps flowing to the second section22of the dehumidifying rotary20. In this case, the second section22of the dehumidifying rotary20acts as the processing zone, and the temperature of the return airflow drops to the dew point. The humidity contained in the return airflow is absorbed by the dehumidifying rotary20, and then the return airflow exits the system.

During the operation of the fresh air conditioning system made in accordance with the fourth embodiment of the present invention, in the dehumidifying process, the fresh airflow utilizes both energy from the first end13of the first cooling device10, and the second cooling end61of the second cooling device60; while the return airflow utilizes energy from the second end14of the first cooling device10, and the second heating end62of the second cooling device60. During humidifying, the fresh airflow utilizes energy from the first end13of the first cooling device10and the second heating end62of the second cooling device60. After the fresh airflow flows through the dehumidifying rotary20, the temperature of the fresh airflow is cooled down after the fresh airflow conducts heat exchange with the second cooling end61of the second cooling device60. While the return airflow utilizes energy from the second end14of the first cooling device10. By this arrangement, energy from both ends of the first cooling device10and the second cooling device60has been effectively utilized. Energy is properly conserved without waste. Compared to the second embodiment of the present invention, the fourth embodiment is more concise and simple, the arrangements and connections of the conduits are simplified.

In conclusion, the fresh air conditioning system properly achieves its intended purposes, i.e. cooling down temperature and dehumidifying the fresh airflow during the summer time, while warm up temperature and humidifying the fresh airflow during the winter time, with simplified configuration without equipping the bubble humidifier. This multi-functional fresh air conditioning system has robust adaptability, effectively utilizes energy from both ends of the cooling device, conserving energy without wasting of them.

It should be understood that even the fresh air conditioning system is illustrated with different embodiments, however, those embodiments are merely illustrative, instead of limiting its embodiments. Any skilled in the art can readily reach to new and different embodiments by modifications, alternations, replacements and remodel of those illustrative embodiments, while those new and different embodiments are all covered by the attached claims.