Heat recovery fresh air handling unit based on collaborative utilization of solar energy and waste heat

Abstract

The utility model discloses a heat recovery fresh air handling unit based on collaborative utilization of solar energy and waste heat, which belongs to the technical field of air conditioning ventilation and comprises an upper box body, a frame type iron stand is fixed at the top of the upper box body, and a water tank connected with a solar heat collector is arranged in the frame type iron stand; the interior of the upper box body is divided into seven cavities, a heat pump system is arranged in the sixth cavity and the seventh cavity, the heat pump system comprises a condenser, a compressor and a double-pipe heat exchanger which are arranged in the sixth cavity and connected in series through a pipeline, the heat pump system further comprises an evaporator arranged in the seventh cavity, a water collecting disc is arranged at the bottom of the evaporator and connected with the condenser, and the condenser is connected with the compressor. An expansion valve is arranged between the water collecting disc and the condenser, and the double-pipe heat exchanger is connected between the evaporator and the compressor. The evaporator is used for replacing a traditional spraying chamber to cool and dehumidify fresh air, the condenser is used for heating the fresh air, the second heat exchange core is arranged to utilize heat of the condenser to reheat the dehumidified fresh air, traditional electric heating reheating is replaced, and energy is saved.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning and ventilation technology, specifically relating to a heat recovery fresh air unit based on the synergistic utilization of solar energy and waste heat. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] As building energy efficiency requirements continue to rise, fresh air heat recovery technology is increasingly being used in air conditioning systems due to its ability to effectively reduce building energy consumption. This technology recovers energy from exhaust air to preheat or precool fresh air, reducing the fresh air load and energy consumption of the air conditioning system. In some buildings that require dehumidification, fresh air handling units also need to be equipped with dehumidification devices.

[0004] However, traditional fresh air dehumidification systems mostly use spray chamber dehumidification technology, which achieves dehumidification through direct contact between water and air. This has the following disadvantages: the temperature of the dehumidified fresh air will drop significantly, making it impossible to directly deliver it indoors for use. It requires additional electric heating, resulting in high energy consumption. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat. It incorporates a heat pump system containing an evaporator and a condenser. The evaporator replaces the traditional spray chamber for cooling and dehumidifying the fresh air, while the condenser heats the fresh air. A second heat exchange core is included, allowing the fresh air in the condenser and evaporator to exchange heat within the second heat exchange core. The heat discharged from the condenser is then used to reheat the dehumidified fresh air, replacing traditional electric heating reheating and saving energy. Furthermore, a solar collector heats the water tank, providing a heat source for the tubular and dual-tube heat exchangers. This preheats the air entering the heating chamber and the low-temperature, low-pressure gaseous refrigerant in the heat pump system, improving compressor efficiency and effectively utilizing solar energy and indoor waste heat.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A heat recovery fresh air unit based on the synergistic utilization of solar energy and waste heat includes a hollow upper box, which is fastened to a lower box. A frame-shaped iron frame is fixed on the top of the upper box, and a water tank connected to a solar collector is installed inside the frame-shaped iron frame.

[0008] The upper chamber is divided into seven chambers. The sixth and seventh chambers are equipped with heat pump systems. The heat pump system includes a condenser, a compressor, and a two-tube heat exchanger connected in series in the sixth chamber via pipes. It also includes an evaporator in the seventh chamber. A water collection tray is installed at the bottom of the evaporator and is connected to the condenser. An expansion valve is installed between the water collection tray and the condenser. The two-tube heat exchanger is connected between the evaporator and the compressor.

[0009] Preferably, multiple buckles are evenly arranged circumferentially at the connection between the upper and lower housings, and the buckles are metal spring locks; several lifting rings are evenly arranged circumferentially on the top surface of the upper housing; a fresh air inlet and a return air outlet are provided on one side wall of the upper housing, and a return air inlet, a winter fresh air outlet, and a summer fresh air outlet are provided on the opposite side wall; a first temperature and humidity sensor is provided at the winter fresh air outlet, and a second temperature and humidity sensor is provided at the summer fresh air outlet.

[0010] Preferably, the fresh air inlet is connected to the first chamber, the return air inlet is connected to the second chamber, the return air outlet is connected to the third chamber, the fresh air outlet in summer is connected to the fourth chamber, and the fresh air outlet in winter is connected to the fifth chamber; the sixth chamber is located between the third and fourth chambers, and the seventh chamber is located between the second, third, fifth, and sixth chambers.

[0011] Preferably, in the first chamber, a first filter is installed near the fresh air inlet; in the second chamber, a second filter is installed near the return air inlet; in the third chamber, a third fan is installed near the return air outlet, a third filter is installed on the side of the third fan away from the return air outlet, and an eighth electric damper is installed at the bottom of the third chamber; in the fourth chamber, a second fan is installed near the summer fresh air outlet; in the fifth chamber, a first fan is installed near the winter fresh air outlet, and a fourth electric damper is installed at the bottom of the fifth chamber.

[0012] Preferably, a first heat exchange core is provided between the first chamber, the second chamber, the third chamber, and the seventh chamber. The first heat exchange core is provided with channel I and channel II. Channel I connects to the second chamber and the third chamber, and channel II connects to the first chamber and the seventh chamber.

[0013] Preferably, a second heat exchange core is provided between the fourth chamber, the fifth chamber, the sixth chamber, and the seventh chamber. The second heat exchange core includes channel III and channel IV. Channel III connects the seventh chamber and the fourth chamber, and channel IV connects the sixth chamber and the fifth chamber.

[0014] Preferably, a first baffle is provided between the first heat exchange core and the evaporator, a second electric air valve is provided on the first baffle, a second baffle is provided between the evaporator and the second heat exchange core, a third electric air valve is provided on the second baffle, a fifth electric air valve is provided at the bottom of the seventh chamber between the evaporator and the third electric air valve; the first baffle and the second baffle form a refrigeration chamber.

[0015] Preferably, on the side of the first baffle away from the refrigeration chamber, a first electric air valve is provided between the sixth and seventh chambers, a third baffle is provided between the compressor and the second heat exchange core, a sixth electric air valve is provided on the third baffle, and the space between the first electric air valve and the sixth electric air valve is the heating chamber.

[0016] Preferably, a tubular heat exchanger is installed between the condenser and the first electric air valve, and the tubular heat exchanger is connected to the water tank; a seventh electric air valve is installed at the bottom of the sixth chamber between the sixth electric air valve and the condenser.

[0017] Preferably, a PLC controller is also provided, which is connected to the tubular heat exchanger, the heat pump system, the dual-tube heat exchanger, and also to all the aforementioned temperature and humidity sensors, electric air valves, and fans.

[0018] Compared with the prior art, the advantages and positive effects of this utility model are:

[0019] This invention features a heat pump system containing an evaporator and a condenser. The evaporator replaces the traditional spray chamber for cooling and dehumidifying fresh air, while the condenser heats the fresh air. A second heat exchange core allows the fresh air in the condenser and evaporator to exchange heat, thus using the heat discharged from the condenser to reheat the dehumidified fresh air, replacing traditional electric heating and saving energy. Furthermore, this invention uses a solar collector to heat a water tank, providing a heat source for tubular and dual-tube heat exchangers. This preheats the air entering the heating chamber and the low-temperature, low-pressure gaseous refrigerant in the heat pump system, improving compressor efficiency and effectively utilizing solar energy and indoor waste heat. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0021] Figure 1 This is a schematic diagram of a fresh air handling unit according to an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional schematic diagram of the fresh air handling unit according to an embodiment of the present invention, along the line connecting the return air outlet and the summer fresh air outlet;

[0023] Figure 3 This is a schematic diagram of the internal structure of the upper housing in summer according to an embodiment of the present invention;

[0024] Figure 4This is a schematic diagram of the internal structure of the upper housing in winter according to an embodiment of the present invention;

[0025] In the picture:

[0026] 1. Fresh air inlet; 2. First filter; 3. First heat exchange core; 4. First electric damper; 5. Second electric damper; 6. Water collection tray; 7. Evaporator; 8. Expansion valve; 9. Third electric damper; 10. Second heat exchange core; 11. Tubular heat exchanger; 12. Second filter; 13. Return air inlet; 14. First fan; 15. Fourth electric damper; 16. First temperature and humidity sensor; 17. Winter fresh air outlet; 18. Fifth electric damper; 19. 20. Second temperature and humidity sensor; 21. Summer fresh air outlet; 22. Second fan; 23. Sixth electric air valve; 24. Seventh electric air valve; 25. Compressor; 26. Dual-tube heat exchanger; 27. Condenser; 28. Eighth electric air valve; 29. ​​Third filter; 30. Third fan; 31. Return air outlet; 32. Solar collector; 33. Water tank; 34. Frame-type iron frame; 35. Upper casing; 36. Lifting ring; 37. Buckle; 38. Lower casing. Detailed Implementation

[0027] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a heat recovery fresh air unit based on the synergistic utilization of solar energy and waste heat, such as... Figure 1 , Figure 2 As shown, it includes a hollow upper box 34, with several lifting rings 35 evenly arranged circumferentially on the top surface of the upper box 34 for lifting the upper box 34; a frame-shaped iron frame 33 is fixedly installed on the top of the upper box 34, and a water tank 32 is installed inside the frame-shaped iron frame 33; as shown... Figure 2 As shown, the water tank 32 is connected to the solar collector 31, and the water in the water tank 32 is heated by the solar collector 31.

[0029] like Figure 1 , Figure 2 As shown, it also includes a lower housing 37 with an opening at the top. The upper housing 34 has the same length and width dimensions as the lower housing 37, and the upper housing 34 is fastened to the upper part of the lower housing 37. It is understandable that, in order to ensure the airtightness of the lower housing 37 after fastening, grooves can be provided at the top of the four side walls of the lower housing 37, and protrusions can be provided at the bottom of the four side walls of the upper housing 34, with the protrusions engaging in the grooves. This is something that can be achieved with existing technology.

[0030] To ensure a secure connection between the upper housing 34 and the lower housing 37, multiple latches 36 are evenly arranged circumferentially at the connection point between the upper housing 34 and the lower housing 37. The latches 36 employ existing metal spring latches (also known as hook-and-loop fasteners), such as stainless steel flat-mouth hook-and-loop fasteners, to ensure that the upper housing fits snugly onto the lower housing.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, one side wall of the upper housing 34 is provided with a fresh air inlet 1 and a return air outlet 30, while the opposite side wall is provided with a return air inlet 13, a winter fresh air outlet 17, and a summer fresh air outlet 20. Figure 3 As shown, the upper housing 34 is divided into seven independent chambers. Specifically, the upper housing 34 includes a first chamber connected to the fresh air inlet 1. In the first chamber, a first filter 2 is installed near the fresh air inlet 1. The function of the first filter 2 is to filter the fresh air when it enters the first chamber from the fresh air inlet 1.

[0032] It also includes a second chamber connected to the return air inlet 13. In the second chamber, a second filter 12 is installed near the return air inlet 13. The function of the second filter 12 is to filter the return air when it enters the second chamber from the return air inlet 13.

[0033] It also includes a third chamber connected to the return air outlet 30. In the third chamber, a third fan 29 is installed near the return air outlet 30 to exhaust the air in the third chamber. A third filter 28 is installed on the side of the third fan 29 away from the return air outlet 30. An eighth electric air valve 27 is installed at the bottom of the third chamber to connect to the lower housing 37. When the eighth electric air valve 27 is opened, the air in the lower housing 37 is discharged to the upper housing 34 through the eighth electric air valve 27 and the third filter 28 under the action of the third fan 29.

[0034] It also includes a fourth chamber connected to the summer fresh air outlet 20 and a fifth chamber connected to the winter fresh air outlet 17; in the fourth chamber, a second fan 21 is installed near the summer fresh air outlet 20 to exhaust air from the fourth chamber; in the fifth chamber, a first fan 14 is installed near the winter fresh air outlet 17 to exhaust air from the fifth chamber; a fourth electric air valve 15 is also installed at the bottom of the fifth chamber to connect to the lower housing 37. When the fourth electric air valve 15 is opened, under the action of the first fan 14, the air in the lower housing 37 is discharged from the upper housing 34 through the fourth electric air valve 15.

[0035] It also includes a sixth chamber and a seventh chamber. Specifically, the sixth chamber is located between the third and fourth chambers, and the seventh chamber is surrounded by the second, third, fifth, and sixth chambers. A first heat exchange core 3 is arranged between the first, second, third, and seventh chambers. Channel I and channel II are provided within the first heat exchange core 3. Channel I connects to the second and third chambers, and channel II connects to the first and seventh chambers. Figure 3 As shown, the return air from the second chamber enters the third chamber through the first heat exchange core 3, and the fresh air from the first chamber enters the seventh chamber through the first heat exchange core 3. In this process, the fresh air and the return air achieve heat exchange in one step.

[0036] A second heat exchange core 10 is provided between the fourth, fifth, sixth, and seventh chambers. The second heat exchange core 10 includes channels III and IV. Channel III connects the seventh and fourth chambers, and channel IV connects the sixth and fifth chambers. Figure 3 As shown, the fresh air from the seventh chamber enters the fourth chamber through the second heat exchange core 10, the fresh air from the sixth chamber enters the fifth chamber through the second heat exchange core 10, and the fresh air from the seventh chamber and the fresh air from the sixth chamber exchange heat through the second heat exchange core 10.

[0037] like Figure 3 , Figure 4 As shown, a condenser 26 is installed in the sixth chamber. The condenser 26 is connected to the compressor 24 and the double-tube heat exchanger 25 in sequence via pipes on the side near the fourth chamber. An evaporator 7 is installed in the seventh chamber. The bottom of the evaporator 7 is connected to a water collection pan 6 via a bracket. The water collection pan 6 discharges condensate to the outside via pipes. The evaporator 7 is connected to the double-tube heat exchanger 25 via pipes. An expansion valve 8 is connected between the evaporator 7 and the condenser 26. The evaporator 7, water collection pan 6, expansion valve 8, condenser 26, compressor 24, and double-tube heat exchanger 25 constitute a heat pump system.

[0038] In this embodiment, the dual-tube heat exchanger 25 provides heat through the water tank 32. That is, the dual-tube heat exchanger 25 and the water tank 32 are connected by a pipeline. Its function is to preheat the low-temperature and low-pressure gaseous refrigerant before it enters the compressor 24. By using the heat from the solar collector through the pipeline and the dual-tube heat exchanger 25 to preheat the low-temperature and low-pressure gaseous refrigerant before the compressor, the working efficiency of the compressor can be improved and the system energy consumption can be reduced.

[0039] like Figure 3 , Figure 4As shown, in the seventh chamber, a first baffle is provided between the first heat exchange core 3 and the evaporator 7, and a second electric air valve 5 is provided on the first baffle. A second baffle is provided between the evaporator 7 and the second heat exchange core 10, and a third electric air valve 9 is provided on the second baffle. In this embodiment, the space between the first baffle and the second baffle forms a refrigeration chamber, and the evaporator 7 dehumidifies and cools the air entering it. The low-temperature surface of the evaporator is used to directly dehumidify the fresh air, avoiding the use of a spray chamber and simplifying the system structure.

[0040] like Figure 3 , Figure 4 As shown, on the side of the first baffle away from the refrigeration chamber, a first electric air valve 4 is installed between the sixth and seventh chambers; inside the sixth chamber, a third baffle is installed between the compressor 24 and the second heat exchange core 10, and a sixth electric air valve 22 is installed on the third baffle. The space between the first electric air valve 4 and the sixth electric air valve 22 is a heating chamber, where the condenser 26 heats the air entering it.

[0041] like Figure 3 , Figure 4 As shown, a tubular heat exchanger 11 is also installed between the condenser 26 and the first electric air valve 4. The tubular heat exchanger 11 is also connected to the water tank 32 via a pipeline. The tubular heat exchanger 11 is used to preheat the incoming air. Figure 3 , Figure 4 As shown, between the evaporator 7 and the third electric air valve 9, a fifth electric air valve 18 is installed at the bottom of the seventh chamber to connect to the lower casing 37; between the sixth electric air valve 22 and the condenser 26, a seventh electric air valve 23 is installed at the bottom of the sixth chamber to connect to the lower casing 37.

[0042] In this embodiment, the first heat exchange core and the second heat exchange core are thin-film heat exchangers.

[0043] Furthermore, this embodiment also includes a PLC controller. A first temperature and humidity sensor 16 is installed at the winter fresh air outlet 17, and a second temperature and humidity sensor 19 is installed at the summer fresh air outlet 20 to detect the temperature and humidity of the air entering the current chamber. All temperature and humidity sensors are connected to the PLC controller and transmit the monitored temperature and humidity information to the PLC controller. In addition, the PLC controller is connected to the eight electric air valves mentioned above to control their opening and closing degrees. The PLC controller is also connected to the three fans mentioned above, as well as the heat pump system, tubular heat exchanger, and dual-tube heat exchanger, to control their start and stop. Temperature and humidity ranges are set within the PLC controller.

[0044] Summer work process:

[0045] Before summer operation, the fresh air inlet 1, summer fresh air outlet 20, return air inlet 13 and return air outlet 30 must be opened, and the winter fresh air outlet 17 must be closed.

[0046] The PLC controller will control the opening of the first fan 14, the second fan 21, the third fan 29, the first electric air valve 4, the second electric air valve 5, the third electric air valve 9, the seventh electric air valve 23, and the eighth electric air valve 27, and control the closing of the fourth electric air valve 15, the fifth electric air valve 18, and the sixth electric air valve 22, and control the opening of the heat pump system and the dual-tube heat exchanger 25, and the closing of the tube heat exchanger 11.

[0047] The solar collector 31 absorbs heat to heat the water tank 32. The water tank 32 is connected to the double-tube heat exchanger 25 to provide a heat source for heating the double-tube heat exchanger 25.

[0048] At this time, the indoor return air enters the second chamber after being filtered by the second filter 12 through the return air inlet 13, then enters the third chamber through the first heat exchange core 3, and finally exits through the third filter 28, the third fan 29 and the return air outlet 30; the fresh air enters the first chamber after being filtered by the first filter 2 through the fresh air inlet 1, and then exchanges heat with the indoor return air through the first heat exchange core 3 to recover the cold energy of the indoor return air; the fresh air that has undergone cold energy recovery pretreatment is split by the first electric air valve 4 and the second electric air valve 5, and enters the refrigeration chamber composed of the evaporator 7 for fresh air dehumidification and refrigeration and the heating chamber composed of the condenser 26 for fresh air heating respectively.

[0049] The heated fresh air enters the lower chamber 37 through the seventh electric air valve 23, and then enters the third chamber through the eighth electric air valve 27 and is discharged together with the indoor return air; the fresh air after dehumidification and cooling enters the fourth chamber through the third electric air valve 9 and the second heat exchange core 10, and finally enters the room through the second fan 21 and the summer fresh air outlet 20.

[0050] When the temperature transmitted by the second temperature and humidity sensor 19 is lower than the set temperature range, the PLC controller controls the fourth electric air valve 15 and the sixth electric air valve 22 to open, and controls the seventh electric air valve 23 to close. The heated fresh air passes through the sixth electric air valve 22, then through the second heat exchange core 10, and then through the first fan 14 and the fourth electric air valve 15 into the lower chamber 37. Finally, it passes through the eighth electric air valve 27 from the lower chamber and returns to the upper chamber 34 to be discharged along with the indoor return air. The dehumidified and cooled fresh air enters the second heat exchange core 10 through the third electric air valve 9 for heating, then enters the fourth chamber, and finally passes through the second fan 21 and the summer fresh air outlet 20 into the room. Using the heat released by the condenser to heat the dehumidified fresh air achieves integrated dehumidification and reheating, reducing additional energy consumption.

[0051] Winter working process:

[0052] Before winter operation, the fresh air inlet 1, winter fresh air outlet 17, return air inlet 13 and return air outlet 30 need to be opened, and the summer fresh air outlet 20 needs to be closed.

[0053] The PLC controller controls the opening of the first fan 14, the third fan 29, the first electric air valve 4, the second electric air valve 5, the fifth electric air valve 18, the sixth electric air valve 22, and the eighth electric air valve 27, and the closing of the second fan 21, the third electric air valve 9, the fourth electric air valve 15, and the seventh electric air valve 23. The heat pump system and the dual-tube heat exchanger 25 and the tubular heat exchanger 11 are also activated. The solar collector 31 absorbs heat to heat the water tank 32, which is connected to the tubular heat exchanger 11 and the dual-tube heat exchanger 25, providing a heat source for them.

[0054] In this process, the indoor return air enters the second chamber after being filtered by the second filter 12 through the return air inlet 13, then enters the third chamber through the first heat exchange core 3, and finally exits through the third filter 28, the third fan 29 and the return air outlet 30; the fresh air enters the first chamber after being filtered by the first filter 2 through the fresh air inlet 1, and then exchanges heat with the indoor return air through the first heat exchange core 3 to recover the heat of the indoor return air; the fresh air that has undergone heat recovery pretreatment is split by the first electric air valve 4 and the second electric air valve 5, and enters the cooling chamber composed of the evaporator 7 for fresh air dehumidification and cooling and the heating chamber composed of the condenser 26 for fresh air heating.

[0055] After the fresh air enters the heating chamber, it is first preheated by the tubular heat exchanger 11, and then further heated to the required temperature by the condenser 26. The heated fresh air then enters the fifth chamber through the sixth electric air valve 22 and the second heat exchange core 10, and is then sent into the room through the first fan 14 and the winter fresh air outlet 17.

[0056] The cooled fresh air enters the lower chamber 37 through the fifth electric air valve 18, and finally returns to the third chamber and is exhausted outdoors after passing through the eighth electric air valve 27 from the lower chamber.

[0057] When the temperature detected by the first temperature and humidity sensor 16 is higher than the set temperature range, that is, when the temperature in the heating chamber becomes higher, the PLC controller can control the tubular heat exchanger 11 to close, and can also change the opening degree of the first electric air valve 4 and the second electric air valve 5 to increase the amount of fresh air entering the heating chamber and decrease the amount of fresh air entering the cooling chamber.

[0058] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat, characterized in that, It includes a hollow upper box that is fastened to a lower box. A frame-shaped iron frame is fixed to the top of the upper box, and a water tank connected to the solar collector is installed inside the frame-shaped iron frame. The upper chamber is divided into seven chambers. The sixth and seventh chambers are equipped with heat pump systems. The heat pump system includes a condenser, a compressor, and a two-tube heat exchanger connected in series in the sixth chamber via pipes. It also includes an evaporator in the seventh chamber. A water collection tray is installed at the bottom of the evaporator and is connected to the condenser. An expansion valve is installed between the water collection tray and the condenser. The two-tube heat exchanger is connected between the evaporator and the compressor.

2. The heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat as described in claim 1, characterized in that, Multiple buckles are evenly arranged circumferentially at the connection between the upper and lower housings, and the buckles are metal spring locks; several lifting rings are evenly arranged circumferentially on the top surface of the upper housing; a fresh air inlet and a return air outlet are provided on one side wall of the upper housing, and a return air inlet, a winter fresh air outlet, and a summer fresh air outlet are provided on the opposite side wall; a first temperature and humidity sensor is provided at the winter fresh air outlet, and a second temperature and humidity sensor is provided at the summer fresh air outlet.

3. A heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat as described in claim 2, characterized in that, The fresh air inlet is connected to the first chamber, the return air inlet is connected to the second chamber, the return air outlet is connected to the third chamber, the fresh air outlet in summer is connected to the fourth chamber, and the fresh air outlet in winter is connected to the fifth chamber; the sixth chamber is located between the third and fourth chambers, and the seventh chamber is located between the second, third, fifth, and sixth chambers.

4. A heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat as described in claim 3, characterized in that, In the first chamber, a first filter is installed near the fresh air inlet; in the second chamber, a second filter is installed near the return air inlet; in the third chamber, a third fan is installed near the return air outlet, a third filter is installed on the side of the third fan away from the return air outlet, and an eighth electric damper is installed at the bottom of the third chamber; in the fourth chamber, a second fan is installed near the summer fresh air outlet; in the fifth chamber, a first fan is installed near the winter fresh air outlet, and a fourth electric damper is installed at the bottom of the fifth chamber.

5. A heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat as described in claim 3, characterized in that, A first heat exchange core is provided between the first chamber, the second chamber, the third chamber, and the seventh chamber. The first heat exchange core is provided with channel I and channel II. Channel I connects to the second chamber and the third chamber, and channel II connects to the first chamber and the seventh chamber.

6. A heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat as described in claim 3, characterized in that, A second heat exchange core is provided between the fourth, fifth, sixth, and seventh chambers. The second heat exchange core includes channel III and channel IV. Channel III connects the seventh and fourth chambers, and channel IV connects the sixth and fifth chambers.

7. A heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat as described in claim 5, characterized in that, A first baffle is provided between the first heat exchange core and the evaporator, a second electric air valve is provided on the first baffle, a second baffle is provided between the evaporator and the second heat exchange core, a third electric air valve is provided on the second baffle, a fifth electric air valve is provided at the bottom of the seventh chamber between the evaporator and the third electric air valve; the first baffle and the second baffle constitute a refrigeration chamber.

8. A heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat as described in claim 7, characterized in that, On the side of the first baffle away from the refrigeration chamber, a first electric air valve is provided between the sixth and seventh chambers, a third baffle is provided between the compressor and the second heat exchange core, a sixth electric air valve is provided on the third baffle, and the heating chamber is located between the first electric air valve and the sixth electric air valve.

9. A heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat as described in claim 8, characterized in that, A tubular heat exchanger is installed between the condenser and the first electric air valve, and the tubular heat exchanger is connected to the water tank; a seventh electric air valve is installed between the sixth electric air valve and the condenser, and at the bottom of the sixth chamber.

10. A heat recovery fresh air handling unit based on the synergistic utilization of solar energy and waste heat as described in claim 9, characterized in that, A PLC controller is also provided, which is connected to the tubular heat exchanger, heat pump system, and dual-tube heat exchanger, as well as to all the aforementioned temperature and humidity sensors, electric air valves, and fans.

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