High-efficiency energy recovery constant-temperature and constant-humidity air conditioner of all fresh air clean room

Abstract

The utility model relates to the technical field of air conditioning equipment, in particular to an efficient energy recovery constant-temperature and constant-humidity air conditioner for a full fresh air clean room, which comprises an air inlet channel, an air exhaust channel and a heat exchanger, a first evaporation coil pipe, a second evaporation coil pipe and a condensation coil pipe are respectively arranged at the rear stage of the heat exchanger in the air inlet channel; and a heat exchange coil and a compressor are respectively arranged at the rear stage of the heat exchanger in the exhaust channel. In order to solve the problems that in the prior art, heat exchange is conducted only through a heat exchanger, the influence of the indoor and outdoor temperature difference is large, and efficiency is low, firstly, a first evaporation coil, a second evaporation coil and a condensation coil are additionally arranged for an air inlet channel, and a heat exchanger and a compressor which are arranged in an exhaust channel are connected; a more accurate temperature and humidity control process can be carried out on fresh air after heat exchange through the first evaporation coil pipe, the second evaporation coil pipe and the condensation coil pipe, and the influence of outdoor temperature difference on energy recovery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning equipment, and in particular to a high-efficiency energy recovery constant temperature and humidity air-conditioning system used in fresh air clean rooms. Background Art

[0002] Currently, clean rooms that require fresh air mainly include negative pressure operating rooms, negative pressure isolation wards, intravenous configuration centers, biosafety laboratories and other areas in hospitals.

[0003] The existing fresh air clean air conditioning system is mainly composed of an independent air supply system and an independent exhaust system. The air supply system adopts a constant temperature and humidity air conditioning unit, and the exhaust air is discharged to the outside after being treated by sterilization and filtration. Because the clean room requires the indoor temperature and humidity to be maintained in a stable range all year round, independent cold and heat sources need to be configured outside the fresh air unit. In summer and winter, a large amount of cooling and heat are required to meet the constant temperature and humidity environment requirements of the clean room.

[0004] In order to reduce energy consumption, the constant temperature and humidity air-conditioning units in a few projects have introduced full heat exchangers in the fresh air system to recover heat and thus reduce energy consumption.

[0005] For example, Chinese patent CN202310048045.5 discloses a fresh air and heat exchange energy-saving system, including a first air duct, a second air duct, an air outlet duct, a fixed frame, a tubular heat exchanger and a honeycomb heat exchanger, wherein the first air duct is provided on the fixed frame, and a second air duct is provided on one side of the first air duct on the fixed frame, the upper end of the first air duct and the upper end of the second air duct are combined into an end pipe, one end of the end pipe is connected to the tubular heat exchanger, the upper end of the end pipe is provided with an air outlet duct, and the air outlet duct is provided at the bottom of the end pipe. One end is connected to the tubular heat exchanger, a honeycomb heat exchanger is provided inside the bottom end of the first air duct, a first air inlet is provided at the lower end of the first air duct, and a second air inlet is provided at the lower end of the second air duct; the tubular heat exchanger includes an outer tube shell and a V-shaped tube, the V-shaped tube is arranged in the outer tube shell, the two ends of the V-shaped tube are respectively flush with the two ends of the outer tube shell, the upper end of the V-shaped tube is connected to the tube wall of the outer tube shell, a cavity is formed outside the V-shaped tube in the outer tube shell, and an inlet and an outlet are respectively provided at the cavity below the V-shaped tube at both ends of the outer tube shell.

[0006] For another example, Chinese patent CN201711144979.X provides a full heat exchange fresh air system, which relates to the field of fresh air fan systems. The full heat exchange fresh air system includes a fresh air fan housing, a first fan, a first air supply duct, a first exhaust duct, and a full heat exchange core. The full heat exchange core includes a core body and a phase change heat exchange component. The core body has an indoor air inlet surface and an indoor air supply surface that are relatively arranged. Both the indoor air inlet surface and the indoor air supply surface are provided with a phase change heat exchange component. The first fan is used to transport outdoor air into the full heat exchange core, and after the air is sequentially subjected to the first temperature change effect of the phase change heat exchange component on the indoor air inlet surface, the second temperature change effect of the core body, and the third temperature change effect of the phase change heat exchange component on the indoor air supply surface, it is transported to the indoor space through the first exhaust duct. The full heat exchange fresh air system makes full use of the natural resource of the temperature difference between day and night, and has a strong ability to regulate temperature.

[0007] However, during the implementation process, the inventors found that this type of technical solution mainly uses a heat exchanger for heat exchange, the heat exchange means are relatively simple, and the heat exchange efficiency directly depends on the conversion efficiency of the heat exchanger itself. The heat exchange effect is greatly affected by the temperature difference between indoor and outdoor. When the temperature difference between indoor and outdoor is small, the heat exchange speed and efficiency are significantly reduced. Utility Model Content

[0008] In view of the above problems existing in the prior art, a high-efficiency energy recovery constant temperature and humidity air conditioner for fresh air clean rooms is provided.

[0009] The specific technical solutions are as follows:

[0010] A high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room, comprising an air inlet channel, an air exhaust channel and a heat exchanger;

[0011] The first air inlet of the air inlet channel is connected to the external space, and the first air outlet of the air inlet channel is connected to the internal space;

[0012] The second air inlet of the exhaust channel is connected to the internal space, and the second air outlet of the exhaust channel is connected to the external space;

[0013] The first heat exchange channel of the first heat exchanger is arranged in the air inlet channel, and the second heat exchange channel of the second heat exchanger is arranged in the air outlet channel;

[0014] The air inlet channel is further provided with a first evaporation coil, a second evaporation coil and a condensation coil at the rear stage of the heat exchanger.

[0015] The exhaust passage is further provided with a heat exchange coil and a compressor at the rear stage of the heat exchanger.

[0016] On the other hand, the air inlet channel includes a first section and a second section;

[0017] The first end of the first section is the first air inlet, and the second end of the first section is connected to the air inlet of the first heat exchange channel;

[0018] The first end of the second section is connected to the air outlet of the first heat exchange channel, and the second end of the second section is connected to the first air outlet;

[0019] A fresh air fan is disposed in the second section, and the blowing direction of the fresh air fan is directed toward the first air outlet.

[0020] On the other hand, the first evaporation coil, the second evaporation coil, and the condensing coil are disposed in the second section.

[0021] On the other hand, a humidifier is also provided between the fresh air fan and the first air outlet.

[0022] On the other hand, a primary-medium efficiency filter is provided in the first section, and a high efficiency filter is provided in the second section.

[0023] On the other hand, a first electric air volume regulating valve is provided at the first air outlet of the first section.

[0024] On the other hand, the exhaust passage includes a third section and a fourth section;

[0025] The first end of the third section is the second air inlet, and the second end of the third section is connected to the air inlet of the second heat exchange channel;

[0026] The first end of the fourth section is connected to the air outlet of the second heat exchange channel, and the second end of the fourth section is the second air outlet;

[0027] An exhaust fan is provided in the third section, and the blowing direction of the exhaust fan is directed toward the heat exchanger.

[0028] On the other hand, the heat exchange coil is provided in the fourth section, and the heat exchange coil is connected to the compressor.

[0029] On the other hand, a plasma sterilization device and an activated carbon filter are provided in the third section.

[0030] On the other hand, a second electric air volume regulating valve is provided at the second air inlet of the third section.

[0031] The above technical solution has the following advantages or beneficial effects:

[0032] In order to solve the problem of low efficiency of heat exchange performed only through heat exchange in the prior art, in this solution, firstly, additional first and second evaporation coils are set for the air inlet channel, and the condensing coil is connected to the heat exchange coil and the compressor. In the subsequent control process, the first and second evaporation coils and the condensing coil can be used to more accurately control the temperature and humidity of the air after heat exchange. For example, in summer, the first and second evaporation coils are used to cool and dehumidify the air processed by the heat exchanger, and then the temperature is increased by the condensing coil to realize the process of reheating after cooling and dehumidification. The heat exceeding the system demand is heated by the heat exchange coil and then discharged to the outside through the exhaust air; in winter, the heat in the indoor exhaust air is absorbed by the heat exchange coil, and then the air processed by the heat exchanger is continuously heated by the condensing coil to achieve a higher temperature difference heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The embodiments of the present invention will be described more fully with reference to the accompanying drawings, which are for illustration and description only and are not intended to limit the scope of the present invention.

[0034] Figure 1 It is an overall schematic diagram of an embodiment of the utility model;

[0035] Figure 2 This is a schematic diagram of summer cold recovery in an embodiment of the present utility model;

[0036] Figure 3 This is a schematic diagram of heat recovery in winter according to an embodiment of the present utility model;

[0037] In the attached figure: 1. Air inlet duct; 2. Air exhaust duct; 3. Heat exchanger; 4. First evaporating coil; 5. Second evaporating coil; 6. Condensing coil; 7. Heat exchange coil; 8. Compressor; 9. Humidifier; 10. Primary and secondary efficiency filters; 11. Fresh air blower; 12. High efficiency filter; 13. Activated carbon filter; 14. Plasma sterilizer; 21. Exhaust fan; A1. First electric regulating valve; A2. Second electric regulating valve; 15. First solenoid valve; 16. First check valve; 17. First filter ; 18. Second solenoid valve; 19. First expansion valve; 20. Second check valve; 22. First electric valve; 23. Third solenoid valve; 24. Second electric valve; 25. Third check valve; 26. Fourth solenoid valve; 27. Fourth check valve; 28. Fifth solenoid valve; 29. Fifth check valve; 30. Sixth solenoid valve; 31. Second filter; 32. Seventh solenoid valve; 33. Second expansion valve; 34. Fifth check valve; 35. Sixth check valve; 36. Eighth solenoid valve; 37. Seventh check valve. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0041] The utility model includes:

[0042] A high-efficiency energy recovery constant temperature and humidity air conditioner for fresh air clean rooms, such as Figure 1 As shown, it includes an air inlet channel 1, an air exhaust channel 2 and a heat exchanger 3;

[0043] The first air inlet of the air inlet channel 1 is connected to the external space, and the first air outlet of the air inlet channel 1 is connected to the internal space;

[0044] The second air inlet of the exhaust channel 2 is connected to the internal space, and the second air outlet of the exhaust channel 2 is connected to the external space;

[0045] The first heat exchange channel of the heat exchanger 3 is arranged in the air inlet channel 1, and the second heat exchange channel of the heat exchanger 3 is arranged in the air outlet channel 2;

[0046] In the air inlet channel 1, primary and secondary efficiency filters are provided in the front stage of the heat exchanger 3;

[0047] In the air inlet channel 1 , a first evaporation coil 4 , a second evaporation coil 5 and a condensation coil 6 are respectively provided at the rear stage of the heat exchanger 3 and are connected to a heat exchange coil 7 and a compressor 8 .

[0048] Specifically, in order to address the problem of low efficiency in the prior art of heat exchange only through heat exchangers, in this solution, first, additional first and second evaporation coils and condensing coils are set for the air inlet channel, and the heat exchange coil 7 and the compressor 8 are connected. In the subsequent control process, the first and second evaporation coils and condensing coils can be used to more accurately control the temperature and humidity of the air after heat exchange, thereby overcoming the defects of the fresh air system in the prior art that can only exchange heat through a heat exchanger and subsequently requires additional adjustment through air conditioning, and the adjustment means are relatively single and the heat exchange efficiency is low.

[0049] Specifically, the air inlet channel 1 includes a first section and a second section;

[0050] The first end of the first section is the first air inlet, and the second end of the first section is connected to the air inlet of the first heat exchange channel;

[0051] The first end of the second section is connected to the air outlet of the first heat exchange channel, and the second end of the second section is connected to the first air outlet;

[0052] A fresh air fan 11 is disposed in the second section, and the blowing direction of the fresh air fan 11 is directed toward the first air outlet.

[0053] The first evaporation coil 4 , the second evaporation coil 5 and the condensation coil 6 are arranged in the second section.

[0054] The preferred position is to arrange the first evaporation coil 4 , the second evaporation coil 5 and the condensation coil 6 between the heat exchanger 3 and the fresh air blower 11 .

[0055] In addition, in order to ensure that the indoor air quality meets relevant requirements, a filtering device is also configured in the first interval. The filtering device is usually a high-efficiency filter, but can also be other equivalent devices.

[0056] For example, in one embodiment, the filtering device includes primary and secondary efficiency filters.

[0057] Furthermore, in order to achieve better filtering effect, primary and secondary efficiency filters are provided at the front stage of the air inlet of the first heat exchange channel.

[0058] Furthermore, a high efficiency filter 12 is provided at the rear stage of the fresh air blower 11 .

[0059] In one embodiment, the exhaust passage 2 includes a third section and a fourth section;

[0060] The first end of the third section is the second air inlet, and the second end of the third section is connected to the air inlet of the second heat exchange channel;

[0061] The first end of the fourth section is connected to the air outlet of the second heat exchange channel, and the second end of the fourth section is the second air outlet;

[0062] An exhaust fan 21 is provided in the third section, and the blowing direction of the exhaust fan 21 is directed toward the heat exchanger 3 .

[0063] The heat exchanger 3 is a full-fin heat exchanger, and the first heat exchange channel and the second heat exchange channel are usually embodied as a combination of multiple groups of straight-through pipes.

[0064] For example, two sets of straight tubes are assembled in a cross configuration, with one set serving as the first heat exchange channel and the other as the second heat exchange channel. The two sets of straight tubes are connected by heat exchange fins or other equivalent structures. When there is a temperature difference between the gases flowing through the two straight tubes, heat is transferred through the fins, achieving a heat exchange process.

[0065] In addition, in order to ensure that the quality of the exhausted air meets the polluted air emission standard, a plasma sterilization device 14 and an activated carbon filter 13 are further arranged in the third section.

[0066] The air inlet duct 1 and the air exhaust duct 2 are manifested as two sets of boxes in the process, usually made of galvanized steel plates, stainless steel and other materials.

[0067] To facilitate the arrangement of the heat exchanger, there are certain parallel sections in the air inlet channel 1 and the air outlet channel 2 for connecting to the heat exchanger.

[0068] In the structure shown in the figure, the parallel section includes upper and lower ventilation boxes, each of which houses a heat exchanger 3 vertically mounted within the box. Both ends of the heat exchanger 3 are connected to the box's sidewalls via a partition. Two sets of straight pipes are distributed within the heat exchanger. The first set of straight pipes serves as the first heat exchange channel, running from the upper box on the left side of the partition to the lower box on the right side of the partition. This box serves as the air inlet channel 1. The second set of straight pipes serves as the second heat exchange channel, running from the upper box on the right side of the partition to the lower box on the left side of the partition. This channel serves as the air outlet channel 2.

[0069] The air inlet channel 1 and the air exhaust channel 2 also have corresponding extended sections for connecting the air inlet and exhaust pipes at specific positions during the construction process.

[0070] In addition, a second electric air volume regulating valve A2 is provided at the first air outlet in the second section.

[0071] A first electric air volume regulating valve A1 is provided at the second air inlet of the third section.

[0072] Among them, the first electric air volume regulating valve and the second electric air volume regulating valve are movable structures, on which a servo mechanism, such as a servo motor, is provided. The servo mechanism is connected to an external control device and opens and closes under the drive of the control device.

[0073] Normally, the first electric air volume regulating valve is opened to perform air intake and exhaust operations, and the second electric air volume regulating valve is opened to perform air supply operations.

[0074] However, in some scenarios, such as when ventilation is not required and when there is a huge temperature difference between indoor and outdoor, the control device can generate corresponding electrical signals to close the first electric air volume regulating valve and the second electric air volume regulating valve respectively.

[0075] Furthermore, the control device can also output electrical signals to adjust the opening and closing angles of the first electric air volume regulating valve and the second electric air volume regulating valve, and adjust the ventilation air volume by changing the rotation speed of the fresh air fan 11 and the exhaust fan 21.

[0076] Specifically, taking the summer scene as an example, assuming the outdoor temperature is 35°C and the indoor temperature is 24°C, the air inlet channel 1 receives 35°C outdoor fresh air and inputs it into the heat exchanger 3, and the air exhaust channel 2 receives 24°C indoor air and inputs it into the heat exchanger 3.

[0077] After heat exchange, the first fresh cold air is formed at a temperature of about 30°C. At the same time, the humidity of the first fresh cold air is relatively high and does not meet the low humidity requirement indoors. Therefore, it is cooled for the first time through the first evaporator coil 4, for example, to 28°C, to form the second fresh cold air, and then cooled for the second time through the second evaporator coil 5 to the dew point temperature of the indoor air state point, for example, 12°C, to form the third fresh cold air. At this time, dew condenses on the second evaporator coil 5 to form condensed water and flows into the water collection tray for drainage, thereby achieving humidity control.

[0078] Furthermore, the 24°C indoor air forms first exhaust hot air of about 26°C after heat exchange, and the first exhaust hot air forms second exhaust hot air of about 30°C after the first heating through the heat exchange coil, and the second exhaust hot air is discharged outdoors through the second air outlet.

[0079] Since the third fresh cold air formed after passing through the second evaporating coil 5 has a low temperature and does not meet the indoor temperature requirement, it can be heated to the air supply state temperature through the condenser 6 to form the first fresh hot air and sent into the room, thereby achieving the indoor constant temperature control process.

[0080] The fourth section is provided with a corresponding compressor 8 and a switch valve matched with the compressor 8 for realizing this process.

[0081] Furthermore, in order to reduce energy consumption, the compressor 8 is connected to the first evaporator coil 4, the second evaporator coil 5, the condensing coil 6 and the heat exchange coil 7 through pipes respectively, and the flow of the medium between the first evaporator coil 4, the second evaporator coil 5, the condensing coil 6 and the heat exchange coil 7 is controlled by the expansion valve to transfer the heat on the first evaporator coil 4 and the second evaporator coil 5 to the condensing coil 6, thereby reducing energy consumption.

[0082] During this process, the first evaporation coil 4 and the second evaporation coil 5 are cooled mainly by the compressor 8 and the expansion valve.

[0083] Furthermore, a heat exchanger 7 is provided in the fourth section of the exhaust passage 2 for discharging air. The heat exchanger 7 is connected to the compressor 8. The heat exchanger 7 is connected to the pipeline of the compressor 8 for transferring and controlling heat.

[0084] In the above process, the operation process of the relevant pipelines of the compressor 8 is as follows:

[0085] During operation, the fifth solenoid valve 28, the sixth solenoid valve 30, and the seventh solenoid valve 32 are closed, and the first solenoid valve 15, the second solenoid valve 18, the third solenoid valve 23, the fourth solenoid valve 26, the first electric valve 22, and the second electric valve 24 are opened. The refrigerant is compressed by the compressor 8 and becomes a high-temperature and high-pressure gas. After passing through the first solenoid valve 15 and the first check valve 16, it enters the indoor heat exchanger and is condensed into a medium-temperature and high-pressure liquid. After being throttled by the first filter 17, the second solenoid valve 18, and the first expansion valve 19, it becomes a low-temperature and low-pressure liquid. After passing through the second check valve 20, it enters the second evaporation coil 5 and becomes a low-temperature and low-pressure gas. Part of the evaporated gas passes through the first electric valve 22 into the first evaporation coil 4 and the seventh check valve 37 (the other part passes through the third solenoid valve 23, the second electric valve 24, and the third check valve 25). The two gases are mixed and enter the compressor 8 to enter the next cycle.

[0086] The above-mentioned fresh air system can also be used in winter scenarios.

[0087] In the winter scenario, assume the outdoor temperature is -2°C and the indoor temperature is 24°C.

[0088] Specifically, the air inlet channel 1 receives outdoor fresh air at -2°C and inputs it into the heat exchanger 3 , and the air outlet channel 2 receives indoor air at 24°C and inputs it into the heat exchanger 3 , and the airflow exchanges heat through the heat exchanger 3 .

[0089] After heat exchange, the second fresh hot air is formed at a temperature of about 8° C., and then is heated to about 24° C. by the condensing coil 6 to form the third fresh hot air.

[0090] In one embodiment, a humidifier 9 is further provided between the fresh air fan 11 and the first air outlet.

[0091] Specifically, considering the above-mentioned air inlet channel 1, it needs to be heated by the condensing coil 6 first in the winter scenario. The low humidity of the outdoor air may lead to the problem of low humidity of the indoor air. In this embodiment, a humidifier 9 is also provided between the fresh air fan 11 and the first air outlet. The humidifier 9 is used to increase the humidity of the third fresh hot air to form a fourth fresh hot air to be sent into the room, so as to achieve the indoor constant humidity control process.

[0092] Furthermore, the 24°C indoor air forms a first row of cold air of about 19°C after heat exchange, and the first row of cold air forms a second row of cold air of about 15°C after the first cooling through the heat exchange coil, and the second row of cold air is discharged outdoors through the second air outlet.

[0093] In the above process, the condensing coil 6 is connected to the compressor 8 to realize heat input. At this time, the cold energy can be transferred to the heat exchanger 7 for output.

[0094] Since the air in the exhaust duct 2 comes from the indoor air with a higher temperature, it forms the first exhaust cold air after heat exchange through the heat exchanger 3. The first exhaust cold air is formed at a temperature of, for example, about 19°C, which is relatively high. Therefore, this part of the heat is absorbed by the heat exchanger 7 and transferred to the condensing coil 6. Compared with the traditional outdoor unit that directly obtains heat from the -2°C environment, it can achieve a higher heating rate and further reduce energy consumption.

[0095] In the above process, the operation process of the compressor 8 is as follows:

[0096] Winter heat recovery process: During operation, the fifth solenoid valve 28, the sixth solenoid valve 30, and the seventh solenoid valve 32 are opened, and the first solenoid valve 15, the second solenoid valve 18, the third solenoid valve 23, the fourth solenoid valve 26, and the second electric valve 24 are closed. The refrigerant is compressed by the compressor 8 and becomes a high-temperature and high-pressure gas. It passes through the fifth solenoid valve 28 and the fifth check valve 29 and enters the condensing coil 6. After condensation, it becomes a medium-temperature and high-pressure liquid. After throttling through the sixth solenoid valve 30, the second filter 31, the seventh solenoid valve 32, and the second expansion valve 33, it becomes a low-temperature and low-pressure liquid. It passes through the fifth check valve 34 and enters the heat exchanger to become a low-temperature and low-pressure gas. The low-temperature and low-pressure gas passes through the sixth check valve 35 and the eighth solenoid valve 36 and enters the compressor 8 to enter the next cycle.

[0097] The beneficial effects of the above technical solution are: integrating current energy-saving technologies with high-efficiency energy recovery constant temperature and humidity air conditioning, reducing the impact of indoor and outdoor temperature differences on heat exchange, significantly improving energy recovery efficiency, and fully recovering and utilizing both cold and hot air year-round in the fully supplied and fully exhausted air system, maximizing the use of indoor air's cold and hot qualities and reducing equipment energy consumption. In summer, when the indoor temperature is 24°C and the outdoor temperature is 35°C, the indoor air can cool the outdoor fresh air, eliminating the need for separate reheating of the cooled and dehumidified fresh air in the summer. In winter, when the indoor temperature is 24°C and the outdoor temperature is -2°C, the indoor air can heat the outdoor fresh air, eliminating the need for separate preheating of the fresh air in the winter.

[0098] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room, characterized in that: It includes an air inlet channel, an air exhaust channel and a heat exchanger; The first air inlet of the air inlet channel is connected to the external space, and the first air outlet of the air inlet channel is connected to the internal space; The second air inlet of the exhaust channel is connected to the internal space, and the second air outlet of the exhaust channel is connected to the external space; The first heat exchange channel of the first heat exchanger is arranged in the air inlet channel, and the second heat exchange channel of the second heat exchanger is arranged in the air outlet channel; The air inlet channel is further provided with a first evaporation coil, a second evaporation coil and a condensation coil at the rear stage of the heat exchanger; The exhaust passage is further provided with a heat exchange coil and a compressor at the rear stage of the heat exchanger.

2. The high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room according to claim 1, characterized in that: The air inlet channel includes a first section and a second section; The first end of the first section is the first air inlet, and the second end of the first section is connected to the air inlet of the first heat exchange channel; The first end of the second section is connected to the air outlet of the first heat exchange channel, and the second end of the second section is connected to the first air outlet; A fresh air fan is disposed in the second section, and the blowing direction of the fresh air fan is directed toward the first air outlet.

3. The high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room according to claim 2, characterized in that: The first evaporation coil, the second evaporation coil, and the condensation coil are disposed in the second section.

4. The high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room according to claim 2, characterized in that: A humidifier is also provided between the fresh air fan and the first air outlet.

5. The high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room according to claim 2, characterized in that: A primary-medium efficiency filter is provided in the first section, and a high efficiency filter is provided in the second section.

6. The high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room according to claim 2, characterized in that: A first electric air volume regulating valve is provided at the first air outlet of the first section.

7. The high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room according to claim 1, characterized in that: The exhaust passage includes a third section and a fourth section; The first end of the third section is the second air inlet, and the second end of the third section is connected to the air inlet of the second heat exchange channel; The first end of the fourth section is connected to the air outlet of the second heat exchange channel, and the second end of the fourth section is the second air outlet; An exhaust fan is provided in the third section, and the blowing direction of the exhaust fan is directed toward the heat exchanger.

8. The high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room according to claim 7, characterized in that: The heat exchange coil is disposed in the fourth section, and the heat exchange coil is connected to the compressor.

9. The high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room according to claim 7, characterized in that: The third section is provided with a plasma sterilization device and an activated carbon filter.

10. The high-efficiency energy recovery constant temperature and humidity air conditioner for a fresh air clean room according to claim 7, characterized in that: A second electric air volume regulating valve is provided at the second air inlet of the third section.

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