A fresh air handling unit with exhaust purification, indirect evaporative cooling, and heat recovery, and its operation method.

Abstract

This invention discloses an exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit and its operation method. This solution applies a photocatalytic reactor to the exhaust air heat recovery fresh air handling unit, which can simultaneously achieve exhaust air purification and exhaust air heat recovery. It can be applied to the air conditioning system of high-density buildings, addressing exhaust air pollution problems in response to public health events and ensuring public health safety. At the same time, by combining evaporative cooling heat recovery technology with a heat pump heat recovery system, the energy recovery of exhaust air is maximized, the exhaust air heat recovery rate is improved, and energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] This invention relates to the fields of fresh air system devices and fresh air system control technology, and in particular to a fresh air handling unit with exhaust air purification, indirect evaporative cooling, and heat recovery, and its operation method. Background Technology

[0002] Under normal conditions, to ensure indoor comfort and health, the demand for fresh air in high-density buildings such as office buildings, shopping malls, classrooms, and auditoriums is higher than in other buildings. Therefore, the fresh air load required for heating and cooling fresh air during air conditioning system operation is relatively high. However, when facing public health issues such as the high incidence of respiratory infectious diseases, to block the aerosol transmission of viruses, two approaches are needed: first, natural ventilation by opening windows to dilute the virus, but many existing buildings do not have the conditions for window ventilation; second, increasing the fresh air supply volume of the air conditioning system, but most existing fresh air systems do not consider 100% fresh air operation conditions. Furthermore, increasing the fresh air volume leads to a sharp increase in fresh air energy consumption, and to maintain indoor pressure balance, potentially virus-laden polluted air needs to be directly discharged outdoors. Therefore, this invention proposes an exhaust purification indirect evaporative cooling heat recovery fresh air unit to solve the technical problem of a sudden surge in fresh air load in high-density buildings, where large amounts of direct exhaust pose potential risks and cause significant energy loss. Summary of the Invention

[0003] In view of this, the purpose of this invention is to propose a fresh air handling unit with exhaust purification, indirect evaporative cooling, and heat recovery, which is reliable in implementation, flexible in application, and has good performance, and its operation method.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by this invention is as follows:

[0005] A fresh air handling unit with exhaust purification, indirect evaporative cooling, and heat recovery includes:

[0006] The housing has an internal mounting cavity, which is divided into two airflow channels by a partition.

[0007] The heat exchange core is a cross-flow plate heat exchanger, which is installed between two airflow channels and divided into a first channel, a second channel, a third channel and a fourth channel. The heat exchange core has two sets of heat exchange channels that cross each other but are not connected to each other. One set of heat exchange channels is connected to the first channel and the third channel at both ends, and the other set of heat exchange channels is connected to the second channel and the fourth channel at both ends.

[0008] A photocatalytic reactor is disposed in the first channel and is used to purify the air input into the first channel. The casing is provided with an exhaust inlet corresponding to the first channel.

[0009] The first heat exchanger is located within the second channel;

[0010] The second heat exchanger is located in the fourth channel and is connected to the first heat exchanger via a pipeline.

[0011] The compressor is connected to the first heat exchanger and the second heat exchanger respectively through a four-way valve, and the first heat exchanger can be used as a condenser and the second heat exchanger as an evaporator, or the second heat exchanger can be used as a condenser and the first heat exchanger as an evaporator, by switching the direction of the four-way valve.

[0012] The first spray assembly is installed inside the housing, with its spray end extending to the first channel and used to spray the heat exchange pipes that connect the heat exchange core to the first channel.

[0013] The second spray assembly is located inside the housing, with its spray end extending to the fourth channel, and is used to spray the second heat exchanger.

[0014] The first spray assembly and the second spray assembly are both connected to an external water supply pipeline. The housing is provided with a fresh air inlet corresponding to the third channel; the housing is provided with a fresh air outlet corresponding to the second channel; and the housing is provided with an exhaust outlet corresponding to the fourth channel. Both the fresh air outlet and the exhaust outlet are provided with fans to assist in conveying airflow.

[0015] As one possible implementation, this solution further includes:

[0016] A water pump is installed on the main pipeline connecting the first spray assembly and the second spray assembly to the external water supply pipeline. The main pipeline has a one-to-one corresponding water pipe branch for each of the first spray assembly and the second spray assembly.

[0017] As a preferred implementation method, the first spray assembly of this solution preferably includes:

[0018] The first valve is installed on the water pipe branch of the main pipeline corresponding to the first spray assembly;

[0019] The first spray head, which is set as the spray end of the first spray assembly, is located in the first channel and is used to spray the heat exchange pipe that connects the heat exchange core to the first channel. The first spray head is connected to the water pipe branch of the main pipeline corresponding to the first spray assembly.

[0020] As a preferred embodiment, the second spray assembly of this solution preferably includes:

[0021] The second valve is installed on the water pipe branch of the main pipeline corresponding to the second spray assembly;

[0022] The second spray head, which is set as the spray end of the second spray assembly, is located in the fourth channel and is used to spray the second heat exchanger. The second spray head is connected to the water pipe branch of the main pipeline corresponding to the second spray assembly.

[0023] Based on the above, this solution also proposes an operation method for an exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit, which utilizes the aforementioned exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit; the operation method includes:

[0024] Execute one of the following operating modes according to preset conditions:

[0025] (1) Summer operation mode;

[0026] (2) Winter operation mode;

[0027] (3) Transitional season operation mode.

[0028] As a preferred implementation method, the summer operation mode of this solution preferably includes the following:

[0029] The first spray assembly turns on to spray water, making the heat exchange core a plate heat recovery heat exchanger. In the heat pump system consisting of the first heat exchanger, the second heat exchanger, and the compressor, the first heat exchanger acts as an evaporator and the second heat exchanger acts as a condenser. At the same time, the second spray assembly also turns on to spray water.

[0030] Outdoor fresh air enters the third channel through the fresh air inlet, then passes through the dry channel of the heat exchange core. Simultaneously, indoor exhaust air enters the first channel through the exhaust inlet, where it passes through a photocatalytic reactor to remove viruses and other pollutants. It then enters the wet channel of the heat exchange core. The fresh air entering through the third channel is cooled and dehumidified by the exhaust air in the heat exchange core before entering the second channel. It is then further cooled and dehumidified by the first heat exchanger, which acts as an evaporator, before being sent into the air-conditioned room through the fresh air outlet. Indoor exhaust air is cooled and humidified by the wet channel of the heat exchange core before entering the fourth channel. It then flows through the second heat exchanger, which acts as a condenser, allowing it to carry away the heat from the condenser, before being discharged outdoors through the exhaust outlet.

[0031] As a preferred implementation method, the winter operation mode of this solution preferably includes the following:

[0032] The first spray assembly stops working, causing the heat exchange core, which is a plate heat recovery heat exchanger, to be converted into a sensible heat exchanger. The refrigerant circulation of the heat pump system, which consists of the first heat exchanger, the second heat exchanger, and the compressor, is switched by a four-way reversing valve, so that the first heat exchanger acts as a condenser and the second heat exchanger acts as an evaporator. At the same time, the second spray assembly also stops working.

[0033] Fresh air and indoor exhaust air enter the third and first channels of the fresh air unit through the fresh air inlet and exhaust air inlet, respectively. The exhaust air passes through the photocatalytic reactor to remove viruses and other harmful substances, and then enters the heat exchange core to exchange sensible heat with the fresh air in another heat exchange channel of the heat exchange core. The exhaust air temperature rises, and then it enters the evaporator of the heat pump system to exchange heat with the evaporator and provide heat for the heat pump system. Finally, it is discharged to the outside through the exhaust air outlet of the fourth channel.

[0034] The fresh air is preheated by the exhaust air through the heat exchange core, then further heated by the condenser of the heat pump system, and finally sent into the room through the fresh air outlet of the second channel.

[0035] As a preferred implementation method, the transitional season operation mode described in this solution preferably includes the following:

[0036] The compressor of the heat pump system in the fresh air handling unit does not start; fresh air enters the room through the bypass duct on the outer casing of the fresh air handling unit.

[0037] Exhaust air enters the first channel through the exhaust inlet, and after the photocatalytic reactor removes viruses and other harmful substances, it passes through the heat exchange core, the fourth channel, and the exhaust outlet in sequence before being discharged outdoors.

[0038] Compared with the prior art, the present invention has the following advantages when using the above technical solution: This solution applies a photocatalytic reactor to an exhaust heat recovery fresh air unit, which can simultaneously achieve exhaust air purification and exhaust air heat recovery. When applied to the air conditioning system of high-density buildings, it can solve the problem of exhaust air pollution in response to public health events and ensure public health safety. At the same time, by combining evaporative cooling heat recovery technology with a heat pump heat recovery system, it can maximize the recovery of exhaust air energy, improve the exhaust air heat recovery rate, and achieve energy saving and emission reduction. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a simplified implementation diagram of the fresh air handling unit in the summer operation mode of this solution;

[0041] Figure 2 This is a simplified implementation diagram of the fresh air handling unit in the winter operation mode of this solution. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Combination Figure 1 or Figure 2 As shown in the figure, this embodiment of the present invention provides an exhaust air purification indirect evaporative cooling heat recovery fresh air unit, which includes:

[0044] The housing 100 has an internal mounting cavity, and the mounting cavity is divided into two airflow channels by a partition 101.

[0045] The heat exchange core 11 is a cross-flow plate heat exchanger, which is installed between two airflow channels and divides them into a first channel 102, a second channel 103, a third channel 104 and a fourth channel 105. The heat exchange core 11 has two sets of heat exchange channels that cross each other but are not connected to each other. The two ends of one set of heat exchange channels are connected to the first channel 102 and the third channel 104 respectively, and the two ends of the other set of heat exchange channels are connected to the second channel 103 and the fourth channel 105 respectively.

[0046] A photocatalytic reactor 10 is disposed in the first channel 102 and is used to purify the air input into the first channel 102. The housing 100 is provided with an exhaust inlet 1 corresponding to the first channel 102.

[0047] The first heat exchanger 5 is located inside the second channel 103;

[0048] The second heat exchanger 6 is installed in the fourth channel 105 and is connected to the first heat exchanger 5 through a pipeline.

[0049] The compressor 8 is connected to the first heat exchanger 5 and the second heat exchanger 6 respectively through the four-way valve 9, and the first heat exchanger 5 can be used as a condenser and the second heat exchanger 6 as an evaporator, or the second heat exchanger 6 can be used as a condenser and the first heat exchanger 5 as an evaporator, through the switching of the four-way valve 9.

[0050] The first spray assembly 13 is disposed inside the housing 100, and its spray end extends to the first channel 102, and is used to spray the heat exchange pipe of the heat exchange core 11 connected to the first channel 102.

[0051] The second spray assembly 14 is disposed inside the housing 100, and its spray end extends to the fourth channel 105 and is used to spray the second heat exchanger 6.

[0052] The first spray assembly 13 (or indirect evaporative cooling spray water device) and the second spray assembly 14 (or evaporative condenser spray water device) are both connected to an external water supply pipeline. The housing 100 is provided with a fresh air inlet 2 corresponding to the third channel 104; the housing 100 is provided with a fresh air outlet 3 corresponding to the second channel 103; and the housing 100 is provided with an exhaust outlet 4 corresponding to the fourth channel 105. The fresh air outlet 3 and the exhaust outlet 4 are each provided with auxiliary airflow fans 31 and 41.

[0053] A water pump 12 is installed on the main pipeline 121 that connects the first spray assembly 13 and the second spray assembly 14 to the external water supply pipeline. The main pipeline 121 has a corresponding water pipe branch for each of the first spray assembly 13 and the second spray assembly 14.

[0054] In one preferred embodiment, the first spray assembly 13 of this solution includes:

[0055] The first valve 131 is installed on the water pipe branch of the main pipeline corresponding to the first spray assembly 13.

[0056] The first spray head 132 is set as the spray end of the first spray assembly 13. It is set in the first channel 102 and is used to spray the heat exchange pipe of the heat exchange core 11 connected to the first channel 102. The first spray head 132 is connected to the water pipe branch of the main pipeline 121 corresponding to the first spray assembly 13.

[0057] As a preferred embodiment, the second spray assembly 14 of this solution preferably includes:

[0058] The second valve 141 is installed on the water pipe branch of the main pipeline 121 corresponding to the second spray assembly 14;

[0059] The second spray head 142 is set as the spray end of the second spray assembly 14. It is located in the fourth channel 104 and is used to spray the second heat exchanger 6. The second spray head 142 is connected to the water pipe branch of the main pipeline 121 corresponding to the second spray assembly 14.

[0060] The working principle of the exhaust purification indirect evaporative cooling heat recovery fresh air unit proposed in this embodiment is as follows: Figure 1 or Figure 2As shown, the equipment mainly consists of a photocatalytic reactor, an indirect evaporative cooling heat recovery heat exchanger (first spray assembly 13), a heat pump system (composed of first heat exchanger 5, second heat exchanger 6 and compressor 8), an evaporative condenser spray water device (second spray assembly 14), and fans 31, 41 and outer casing 100, etc. The indirect evaporative cooling heat recovery heat exchanger may include a plate heat recovery heat exchange core 11 and an indirect evaporative cooling spray water device 13.

[0061] For ease of control, this solution can also be connected to the first spray assembly 13 (or indirect evaporative cooling spray water device), the second spray assembly 14 (or evaporative condenser spray water device), the fan 31, 41, the compressor 8, the four-way reversing valve 9, the water pump 12, etc., through a controller, and control their operation and opening / closing.

[0062] Based on the above, this solution also proposes an operation method for an exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit, which utilizes the aforementioned exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit; the operation method includes: executing one of the following operation modes according to preset conditions:

[0063] (1) Summer operation mode;

[0064] (2) Winter operation mode;

[0065] (3) Transitional season operation mode.

[0066] Key points combined Figure 1 As shown, as a preferred implementation method, the summer operation mode of this solution preferably includes the following:

[0067] The first spray assembly 13 (or indirect evaporative cooling spray water device) turns on to spray water, so that the heat exchange core 11 (or plate heat recovery heat exchange core) acts as a plate heat recovery heat exchanger. In the heat pump system composed of the first heat exchanger 5, the second heat exchanger 6 and the compressor 8, the first heat exchanger 5 acts as an evaporator and the second heat exchanger 6 acts as a condenser. At the same time, the second spray assembly 14 (or evaporative condenser spray water device) also turns on to spray water.

[0068] Outdoor fresh air enters the third channel 104 through the fresh air inlet 2, and then passes through the dry channel of the heat exchange core 11. At the same time, indoor exhaust air enters the first channel 102 through the exhaust inlet 1, passes through the photocatalytic reactor 10 to remove viruses and other pollutants, and then enters the wet channel of the heat exchange core 11. The fresh air entering the third channel 104 is cooled and dehumidified by the exhaust air in the heat exchange core 11, and then enters the second channel 103. After that, it is further cooled and dehumidified by the first heat exchanger 5, which acts as an evaporator, and then sent to the air-conditioned room through the fresh air outlet 3. The indoor exhaust air is cooled and humidified by the wet channel of the heat exchange core 11, and then enters the fourth channel 105. After that, it flows through the second heat exchanger 6, which acts as a condenser, so that it carries away the heat from the condenser, and then is discharged to the outside through the exhaust outlet 4.

[0069] Combination Figure 2 As shown, as a preferred implementation method, the winter operation mode of this solution preferably includes the following:

[0070] The first spray assembly 13 (or indirect evaporative cooling spray water device) stops working, causing the heat exchange core 11, which is a plate heat recovery heat exchanger, to be converted into a sensible heat exchanger. The refrigerant circulation of the heat pump system composed of the first heat exchanger 5, the second heat exchanger 6 and the compressor 8 is switched by the four-way reversing valve 9, so that the first heat exchanger 5 acts as a condenser and the second heat exchanger 6 acts as an evaporator. At the same time, the second spray assembly 14 (or evaporative condenser spray water device) also stops working.

[0071] Fresh air and indoor exhaust air enter the third channel 104 and the first channel 102 of the fresh air unit through fresh air inlet 2 and exhaust air inlet 1, respectively. The exhaust air passes through the photocatalytic reactor 10 to remove viruses and other harmful substances, and then enters the heat exchange core 11 to exchange sensible heat with the fresh air in another heat exchange channel in the heat exchange core 11. The exhaust air temperature rises, and then it enters the evaporator (second heat exchanger 6) of the heat pump system to exchange heat with the evaporator (second heat exchanger 6) to provide heat for the heat pump system. Finally, it is discharged to the outside through the exhaust outlet of the fourth channel 105.

[0072] The fresh air is preheated by the exhaust air through the heat exchange core 11, and then further heated by the condenser (first heat exchanger 5) of the heat pump system, and then sent into the room through the fresh air outlet 3 of the second channel 103.

[0073] In addition to the above, as a preferred implementation method, the transition season operation mode of this solution preferably includes the following:

[0074] The compressor of the heat pump system in the fresh air handling unit does not start; fresh air enters the room through the bypass duct on the outer casing of the fresh air handling unit.

[0075] Exhaust air enters the first channel through the exhaust inlet, and after the photocatalytic reactor removes viruses and other harmful substances, it passes through the heat exchange core, the fourth channel, and the exhaust outlet in sequence before being discharged outdoors.

[0076] The above description is only a part of the embodiments of the present invention and does not limit the scope of protection of the present invention. Any equivalent device or equivalent process transformation made based on the content of the present invention specification and drawings, or direct or indirect application in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit, characterized in that, It comprises: The shell is internally formed with an installation cavity, and the installation cavity is divided into two airflow channels by a partition plate; The heat exchange core is a cross-counterflow plate heat exchanger, which is installed between the two airflow channels and divides the two airflow channels into a first channel, a second channel, a third channel and a fourth channel, and the heat exchange core has two groups of heat exchange channels which cross each other but do not communicate with each other, one end of one group of heat exchange channels is connected to the first channel and the other end is connected to the third channel, and one end of the other group of heat exchange channels is connected to the second channel and the other end is connected to the fourth channel; The photocatalytic reactor is arranged in the first channel and is used for purifying air input into the first channel, and the shell is provided with an air outlet corresponding to the first channel; The first heat exchanger is arranged in the second channel; The second heat exchanger is arranged in the fourth channel and is connected to the first heat exchanger through a pipeline; The compressor is connected to the first heat exchanger and the second heat exchanger through a four-way valve, and the first heat exchanger serves as a condenser and the second heat exchanger serves as an evaporator or the second heat exchanger serves as a condenser and the first heat exchanger serves as an evaporator through the switching of the four-way valve; The first spraying assembly is arranged in the shell, the spraying end of the first spraying assembly extends into the first channel, and the first spraying assembly is used for spraying the heat exchange pipelines of the heat exchange core which communicate with the first channel; The second spraying assembly is arranged in the shell, the spraying end of the second spraying assembly extends into the fourth channel, and the second spraying assembly is used for spraying the second heat exchanger; The first spraying assembly and the second spraying assembly are connected to an external water supply pipeline, the shell is provided with a fresh air inlet corresponding to the third channel, the shell is provided with a fresh air outlet corresponding to the second channel, the shell is provided with an air outlet corresponding to the fourth channel, and a fan for assisting air flow is arranged on the fresh air outlet and the air outlet.

2. The exhaust air cleaning indirect evaporative cooling heat recovery fresh air handling unit of claim 1, wherein, It further comprises: The water pump is arranged on a main pipeline through which the first spraying assembly and the second spraying assembly are connected to the external water supply pipeline, and the main pipeline is provided with a water pipeline branch corresponding to the first spraying assembly and a water pipeline branch corresponding to the second spraying assembly.

3. The exhaust air cleaning indirect evaporative cooling heat recovery fresh air handling unit of claim 2, wherein, The first spraying assembly comprises: The first valve is arranged on the water pipeline branch corresponding to the first spraying assembly of the main pipeline; The first spraying head is arranged in the first channel and is used for spraying the heat exchange pipelines of the heat exchange core which communicate with the first channel, and the first spraying head is connected to the water pipeline branch corresponding to the first spraying assembly of the main pipeline.

4. The exhaust air cleaning indirect evaporative cooling heat recovery fresh air handling unit of claim 2, wherein, The second spraying assembly comprises: The second valve is arranged on the water pipeline branch corresponding to the second spraying assembly of the main pipeline; The second spraying head is arranged in the fourth channel and is used for spraying the second heat exchanger, and the second spraying head is connected to the water pipeline branch corresponding to the second spraying assembly of the main pipeline.

5. A method for operating an exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit, characterized in that, The application has the exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit claimed in any one of claims 1 to 4; and the operation method comprises: One of the following operation modes is executed according to a preset condition: (1) summer operation mode; (2) winter operation mode; (3) transition season operation mode.

6. The operation method of the exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit according to claim 5, characterized in that, The summer operation mode comprises the following: The first spraying assembly opens to spray water, so that the heat exchange core body functions as a plate heat recovery heat exchanger, the first heat exchanger functions as an evaporator, and the second heat exchanger functions as a condenser in the heat pump system composed of the first heat exchanger, the second heat exchanger and the compressor; meanwhile, the second spraying assembly also opens to spray water; The outdoor fresh air enters the third channel through the fresh air inlet, and then passes through the dry channel of the heat exchange core body; meanwhile, the indoor exhaust air enters the first channel through the exhaust air inlet, removes viruses through the photocatalytic reactor, and then enters the wet channel of the heat exchange core body; the fresh air input through the third channel is cooled and dehumidified by the exhaust air through the heat exchange core body, and then enters the second channel; the fresh air is further cooled and dehumidified by the first heat exchanger as an evaporator, and then is sent into the air-conditioned room through the fresh air outlet; the indoor exhaust air is cooled and humidified through the wet channel of the heat exchange core body, and then enters the fourth channel; the exhaust air passes through the second heat exchanger as a condenser, and then is discharged to the outdoor through the exhaust air outlet.

7. The operation method of the exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit according to claim 5, characterized in that, The winter operation mode comprises the following steps: The first spraying assembly stops working, so that the heat exchange core body as a plate heat recovery heat exchanger is converted into a sensible heat exchanger; the refrigerant cycle of the heat pump system composed of the first heat exchanger, the second heat exchanger and the compressor is switched through the four-way reversing valve, so that the first heat exchanger functions as a condenser, and the second heat exchanger functions as an evaporator; meanwhile, the second spraying assembly also stops working; The fresh air and the indoor exhaust air enter the third channel and the first channel of the fresh air unit through the fresh air inlet and the exhaust air inlet respectively; the exhaust air removes viruses through the photocatalytic reactor, and then exchanges sensible heat with the fresh air in another heat exchange channel of the heat exchange core body, so that the temperature of the exhaust air is increased; the exhaust air then enters the evaporator of the heat pump system, exchanges heat with the evaporator, and provides heat for the heat pump system; the fresh air is then preheated by the exhaust air through the heat exchange core body, and then is further heated by the condenser of the heat pump system; the fresh air is then sent into the indoor through the fresh air outlet of the second channel. The transition season operation mode comprises the following steps:

8. The operation method of the exhaust air purification indirect evaporative cooling heat recovery fresh air handling unit according to claim 5, characterized in that, The compressor of the heat pump system of the fresh air unit is not started; the fresh air enters the indoor through the bypass pipeline of the shell of the fresh air unit; The exhaust air enters the first channel through the exhaust air inlet, and then is discharged to the outdoor through the fourth channel and the exhaust air outlet after removing viruses through the photocatalytic reactor and sequentially passing through the heat exchange core body. ​

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