Deep heat recovery fresh air handling unit suitable for severe cold and cold regions

Abstract

The utility model discloses a deep heat recovery fresh air handling unit suitable for severe cold and cold areas, which comprises an air supply system and an air exhaust system, and a primary efficiency filter section, a heat recovery section, an air cooling condensation section, a fresh air mixing section, a primary and medium efficiency filter section, a hot and cold coil section, a humidifying section and an air supply section are sequentially arranged in the air supply system. An air return air section, the heat recovery section, an air cooling evaporation section, an air exhaust air section and an air exhaust section are sequentially arranged in the air exhaust system, and the heat recovery section is a total heat exchanger and is used for heat and humidity exchange between fresh air and exhaust air so as to improve the temperature and humidity of the fresh air and reduce the temperature and humidity of the exhaust air. According to the utility model, the traditional high-temperature water preheating coil pipe is effectively replaced, and the dual goals of energy conservation, consumption reduction and equipment protection are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of fresh air treatment in a heating, ventilation and air conditioning system, and in particular to a deep heat recovery fresh air unit suitable for severely cold and cold areas. Background Art

[0002] For a long time, the heating coils of fresh air air-conditioning boxes in some public buildings in the extremely cold and frigid areas of northern my country have often been frozen and cracked during winter heating due to the low outdoor temperature. In addition, for areas where the outdoor air-conditioning design temperature is below -5°C in winter, fresh air air-conditioning boxes usually need to be equipped with high-temperature water (water temperature above 70°C) to preheat the coils in winter. Therefore, a high-temperature water system needs to be designed, and a high-temperature heat source needs to be set up in conjunction. However, winter heating in the north basically uses municipal heating, and the municipal heating temperature changes throughout the heating cycle, which cannot effectively guarantee the water temperature of the fresh air preheating system.

[0003] In the severely cold and frigid areas of the north, the winter temperature is low, the heating cycle is long, and the energy consumption of building heating is high. The building energy-saving design specifications usually only require fresh air heat recovery for the treatment of fresh air in public buildings. However, in the severely cold and frigid areas of the north, the outdoor temperature is mostly below -10℃, and the energy consumption of fresh air treatment is extremely high. The conventional practice is to preheat the fresh air to above -5℃ and then exchange heat with the indoor exhaust air. After the heat exchange, the indoor exhaust air is reduced to a temperature of about 8℃ and discharged outdoors. The energy in the indoor exhaust air is not deeply recovered, and the low-temperature outdoor fresh air has to be treated to above 20℃. Therefore, the conventional fresh air heat recovery treatment method causes great energy waste, which is not conducive to energy saving, emission reduction, and carbon reduction. Summary of the Invention

[0004] In view of the above problems existing in the existing fresh air heat recovery treatment method, the present invention aims to provide a deep heat recovery fresh air unit suitable for severe cold and cold areas.

[0005] The specific technical solutions are as follows:

[0006] A deep heat recovery fresh air unit suitable for severe cold and cold areas, comprising:

[0007] Air supply system, wherein the air supply system is sequentially provided with a primary filter section, a heat recovery section, an air-cooled condensing section, a fresh air mixing section, a primary and secondary filter section, a hot and cold coil section, a humidification section and an air supply section;

[0008] An exhaust system, wherein the exhaust system is sequentially provided with a return air section, the heat recovery section, an air-cooled evaporation section, an exhaust air section, and an exhaust section;

[0009] The heat recovery section is a full heat exchanger, which is used for heat and moisture exchange between fresh air and exhaust air to increase the temperature and humidity of the fresh air and reduce the temperature and humidity of the exhaust air;

[0010] The air supply system also includes:

[0011] An outdoor fresh air main pipe is connected to the primary filter section via a primary air supply duct and to the fresh air mixing section via a secondary air supply duct, and both the primary air supply duct and the secondary air supply duct are provided with electric regulating valves, and the opening of the electric regulating valves is adjusted to adjust the amount of fresh air passing through the first air supply duct / the secondary air supply duct.

[0012] As a further improvement and optimization of this solution, the exhaust system further includes:

[0013] The indoor return air main pipe is connected to the return air section via a first return air duct and to the exhaust air section via a second return air duct. Both the first return air duct and the second return air duct are provided with exhaust airtight electric valves.

[0014] As a further improvement and optimization of this solution, the air-cooled condensation section has a first temperature sensor for detecting the temperature of the primary fresh air after preheating, the fresh air mixing section has a second temperature sensor for detecting the temperature after the primary and secondary fresh air are mixed, the air supply section has a third temperature sensor for detecting the fresh air supply temperature, and the air-cooled evaporation section has a fourth temperature sensor for detecting the exhaust air temperature.

[0015] As a further improvement and optimization of this solution, the air supply system also includes an air supply main pipe connected to the air supply section, and the air supply main pipe is provided with an air supply regulating valve. By controlling the opening of the air supply regulating valve, the indoor fresh air supply volume is adjusted.

[0016] As a further improvement and optimization of this solution, the exhaust system also includes an exhaust main pipe connected to the exhaust section, and the exhaust main pipe is provided with an exhaust regulating valve. The opening of the exhaust regulating valve is controlled to adjust the exhaust volume to the outside.

[0017] As a further improvement and optimization of this solution, the air-cooled condensing section includes an air-cooled condenser, the air-cooled evaporating section includes an air-cooled evaporator and a compressor connected to each other, and the air-cooled condenser is connected to the air-cooled evaporator and the compressor respectively.

[0018] As a further improvement and optimization of this solution, a solenoid valve is further connected between the air-cooled condenser and the air-cooled evaporator.

[0019] As a further improvement and optimization of this solution, the air supply system and the exhaust system are both arranged horizontally.

[0020] Compared with the prior art, the above technical solution has the following positive effects:

[0021] (1) In the present invention, in winter, during the fresh air processing process, the outdoor fresh air is intelligently divided into two parts: one part first exchanges energy with the indoor high-temperature and high-humidity exhaust air through a full heat exchanger, recovers its heat and humidity, and then is further heated through an air-cooled condensation section, and then mixed with another part of the low-temperature fresh air that has not been heat recovered, ensuring that the temperature of the mixed fresh air is higher than -5°C, thereby eliminating the need for traditional high-temperature water preheating coils. The mixed fresh air is then filtered, additionally heated and humidified, and finally sent into the room. At the same time, the indoor exhaust air also exchanges heat and moisture with the fresh air through a full heat exchanger. After the temperature drops to about 7.5°C, its remaining energy is extracted by the built-in air-cooled evaporator of the unit to heat the fresh air. Finally, the exhaust air temperature drops to about 1.5°C and is discharged outdoors, realizing efficient energy recycling.

[0022] (2) In the present invention, the outdoor fresh air is cleverly divided into two parts through the outdoor fresh air main pipe. The primary fresh air enters the unit through a specific air supply pipe, and after going through the primary filtration section, full heat recovery and air-cooled condensation section heating steps, it merges with the secondary fresh air directly introduced from another route in the fresh air mixing section, significantly increasing the total amount of fresh air. During this process, the primary fresh air volume is precisely controlled to 50% of the total exhaust volume to maximize the heat and moisture exchange efficiency and ensure that the temperature of the mixed fresh air is stably above -5°C after being heated in the air-cooled condensation section. This innovative design effectively replaces the traditional high-temperature water preheating coil and achieves the dual goals of energy saving and equipment protection.

[0023] (3) In the present invention, after the indoor return air enters the unit, it first exchanges energy with the fresh air in the full heat recovery section to reduce the temperature and humidity. Then, this energy-rich return air enters the air-cooled evaporation section, further releases its heat energy and is discharged outdoors. The key to this process is that the amount of high-temperature return air is set to twice that of low-temperature fresh air, ensuring that the exhaust air temperature after heat exchange is maintained above 7.5°C, providing sufficient heat source for the air-cooled condensation section. At the same time, the air-cooled evaporation section reduces the exhaust air temperature by about 6°C, which not only meets the demand for fresh air heating, but also ensures the stable operation and high-efficiency output of the air-cooled condensation section and the air-cooled evaporation section.

[0024] (4) In the present invention, during the transition season, fresh air is directly introduced through the outdoor fresh air main pipe 19 and enters the unit through the secondary air supply pipe. At this time, the electric regulating valve on the primary air supply pipe is closed, and the fresh air is directly sent into the room after being filtered, effectively bypassing the primary filtration, heat recovery and air-cooled condensation sections, significantly reducing the resistance of the air supply system. At the same time, the indoor return air is discharged to the outside through the indoor side return air main pipe. During this process, the exhaust airtight electric valve on the first return air duct remains closed, avoiding the exhaust air from flowing through the heat recovery section and the air-cooled evaporation section, thereby reducing the resistance of the exhaust system and improving the overall operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of a deep heat recovery fresh air unit suitable for severe cold and cold areas in the utility model;

[0026] Figure 2 This is a structural diagram of an air supply system of a deep heat recovery fresh air unit suitable for severe cold and cold areas in the utility model;

[0027] Figure 3 This is a structural diagram of an exhaust system of a deep heat recovery fresh air unit suitable for severe cold and cold areas in the utility model;

[0028] Figure 4 This is a psychrometric diagram of the air treatment process of a deep heat recovery fresh air unit suitable for severe cold and cold areas in the utility model;

[0029] In the attached figure: 1. Air supply system; 2. Exhaust system; 11. Primary filter section; 12. Heat recovery section; 13. Air-cooled condensing section; 14. Fresh air mixing section; 15. Primary and secondary filter section; 16. Hot and cold coil section; 17. Humidification section; 18. Air supply section; 19. Outdoor fresh air main pipe; 131. First temperature sensor; 141. Second temperature sensor; 181. Air supply main pipe; 182. Air supply regulating valve; 183. Third temperature sensor; 191 , primary air supply duct; 192, secondary air supply duct; 193, electric regulating valve; 21, return air section; 22, compressor; 23, air-cooled evaporation section; 24, exhaust air section; 25, exhaust section; 26, indoor return air main pipe; 27, exhaust main pipe; 28, solenoid valve; 231, fourth temperature sensor; 261, first return air duct; 262, second return air duct; 263, exhaust airtight electric valve; 271, exhaust regulating valve. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like are used to indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of this utility model and to simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] Figure 1 This is a structural diagram of a deep heat recovery fresh air unit suitable for severe cold and cold areas. Figure 2 This is a structural diagram of a fresh air system of a deep heat recovery fresh air unit suitable for severe cold and cold areas. Figure 3 This is a schematic diagram of the structure of the exhaust system of a deep heat recovery fresh air unit suitable for severe cold and cold areas. Figure 4 This is a psychrometric diagram of the air treatment process of a deep heat recovery fresh air unit suitable for severe cold and cold areas. Figure 1-4As shown, a preferred embodiment of a deep heat recovery fresh air unit suitable for severe cold and cold areas is shown, comprising: an air supply system 1 and an exhaust system 2, wherein the air supply system 1 is provided with a primary filter section 11, a heat recovery section 12, an air-cooled condensing section 13, a fresh air mixing section 14, a primary and secondary filter section 15, a hot and cold coil section, a humidifying section 17 and an air supply section 18 in sequence, and the exhaust system 2 is provided with a return air section 21, a heat recovery section 12, an air-cooled evaporating section 23, an exhaust air section 24 and an exhaust section 25 in sequence, wherein the heat recovery section 12 is a full heat exchanger for fresh air Heat and moisture exchange between the fresh air and the exhaust air to increase the temperature and humidity of the fresh air and reduce the temperature and humidity of the exhaust air; the air supply system 1 also includes: an outdoor fresh air main pipe 19, the outdoor fresh air main pipe 19 is connected to the primary filter section 11 through a primary air supply duct 191, and is connected to the fresh air mixing section 14 through a secondary air supply duct 192, and an electric regulating valve 193 is provided on the primary air supply duct 191 and the secondary air supply duct 192. By adjusting the opening of the electric regulating valve 193, the amount of fresh air passing through the primary air supply duct 191 / secondary air supply duct 192 can be adjusted.

[0034] In this embodiment, in winter, during the fresh air processing process, the outdoor fresh air is intelligently divided into two parts: one part first exchanges energy with the indoor high-temperature and high-humidity exhaust air through a full heat exchanger, recovers its heat and humidity, and then is further heated through the air-cooled condensation section 13, and then mixed with the other part of the low-temperature fresh air that has not been heat recovered, to ensure that the temperature of the mixed fresh air is higher than -5°C, thereby eliminating the traditional high-temperature water preheating coil. The mixed fresh air is then filtered, additionally heated and humidified, and finally sent into the room. At the same time, the indoor exhaust air also exchanges heat and moisture with the fresh air through a full heat exchanger. After the temperature drops to about 7.5°C, its remaining energy is extracted by the built-in air-cooled evaporator of the unit to heat the fresh air. Finally, the exhaust air temperature is reduced to about 1.5°C and then discharged outdoors, realizing efficient energy recycling.

[0035] Specifically, the outdoor fresh air is cleverly divided into two parts through the outdoor fresh air main 19. The primary fresh air enters the unit through a specific air supply duct, and after undergoing the primary filtration section 11, full heat recovery and heating in the air-cooled condensation section 13, it merges with the secondary fresh air directly introduced from another route in the fresh air mixing section 14, significantly increasing the total amount of fresh air. In this process, the primary fresh air volume is precisely controlled to 50% of the total exhaust volume to maximize the heat and moisture exchange efficiency, and ensure that after heating in the air-cooled condensation section 13, the temperature of the mixed fresh air is stably above -5°C. This innovative design effectively replaces the traditional high-temperature water preheating coil, achieving the dual goals of energy saving and consumption reduction and equipment protection.

[0036] Specifically, after the indoor return air enters the unit, it first exchanges energy with the fresh air in the full heat recovery section 12 to reduce the temperature and humidity. Then, this energy-rich return air enters the air-cooled evaporation section 23, further releases its heat energy and is discharged outdoors. The key to this process is that the amount of high-temperature return air is set to twice that of the low-temperature fresh air, ensuring that the exhaust air temperature after heat exchange is maintained above 7.5°C, providing sufficient heat source for the air-cooled condensation section 13. At the same time, the air-cooled evaporation section 23 reduces the exhaust air temperature by about 6°C, which not only meets the demand for fresh air heating, but also ensures the stable operation and high-efficiency output of the air-cooled condensation section 13 and the air-cooled evaporation section 23.

[0037] Furthermore, as a preferred embodiment, the exhaust system 2 also includes: an indoor return air main duct 26, which is connected to the return air section 21 through a first return air duct 261 and to the exhaust air section 24 through a second return air duct 262, and both the first return air duct 261 and the second return air duct 262 are provided with exhaust airtight electric valves 263.

[0038] More preferably, in the transition season, fresh air is directly introduced through the outdoor fresh air main 19 and enters the unit through the secondary air supply duct. At this time, the electric regulating valve 193 on the primary air supply duct is closed, and the fresh air is directly sent into the room after being filtered, effectively bypassing the primary filtration, heat recovery and air-cooled condensation sections, significantly reducing the resistance of the air supply system 1. At the same time, the indoor return air is discharged to the outdoors through the indoor side return air main 26. During this process, the exhaust airtight electric valve 263 on the first return air duct 261 remains closed, avoiding the exhaust air from flowing through the heat recovery section 12 and the air-cooled evaporation section 23, thereby reducing the resistance of the exhaust system 2 and improving the overall operating efficiency.

[0039] Furthermore, as a preferred embodiment, the air-cooled condensation section 13 has a first temperature sensor 131 for detecting the temperature of the primary fresh air after preheating, the fresh air mixing section 14 has a second temperature sensor 141 for detecting the temperature after the primary and secondary fresh air are mixed, the air supply section 18 has a third temperature sensor 183 for detecting the fresh air supply temperature, and the air-cooled evaporation section 23 has a fourth temperature sensor 231 for detecting the exhaust air temperature.

[0040] The control system of this unit adopts an intelligent adjustment strategy to ensure operational efficiency and comfort. First, according to the outlet air temperature of the air-cooled condensing section 13 and the fresh air evaporating section, the opening of the electric regulating valve 193 on the primary air supply duct is automatically adjusted to accurately control the primary fresh air volume, which not only ensures that the exhaust air temperature at the outlet of the air-cooled evaporating section 23 is not lower than 1°C, but also ensures that the outlet air temperature of the air-cooled condensing section 13 is higher than 16°C, effectively balancing energy efficiency and heating requirements. Secondly, the temperature sensor of the fresh air mixing section 14 is used to adjust the electric regulating valve 193 on the secondary fresh air supply duct in real time to optimize the secondary fresh air volume, ensuring that the temperature of the mixed primary and secondary fresh air is always maintained above -5°C, ensuring a warm and comfortable indoor environment. Finally, the temperature sensor of the air supply section 18 is used to accurately control the opening of the electric water valve of the hot and cold coil section 16, and finely adjust the fresh air supply temperature to meet the preset indoor environmental standards.

[0041] Furthermore, as a preferred embodiment, the air supply system 1 also includes an air supply main pipe 181 connected to the air supply section 18, and the air supply main pipe 181 is provided with an air supply regulating valve 182, which controls the opening of the air supply regulating valve 182 to adjust the indoor fresh air supply volume.

[0042] Furthermore, as a preferred embodiment, the exhaust system 2 also includes an exhaust main pipe 27 connected to the exhaust section 25, and the exhaust main pipe 27 is provided with an exhaust regulating valve 271. By controlling the opening of the exhaust regulating valve 271, the exhaust volume to the outside can be adjusted.

[0043] Furthermore, as a preferred embodiment, the air-cooled condensing section 13 includes an air-cooled condenser, and the air-cooled evaporating section 23 includes an air-cooled evaporator and a compressor 22 connected to each other, and the air-cooled condenser is connected to the air-cooled evaporator and the compressor 22 respectively.

[0044] More preferably, the primary filter section 11 has a primary filter, the primary and secondary filter section 15 has a primary and secondary filter 1, the hot and cold coil section 16 has a hot and cold coil, the humidifying section 17 has a humidifier, the air supply section 18 has a blower, and the exhaust section 25 has an exhaust fan.

[0045] Furthermore, as a preferred embodiment, a solenoid valve 28 is connected between the air-cooled condenser and the air-cooled evaporator.

[0046] Furthermore, as a preferred embodiment, the air supply system 1 and the air exhaust system 2 are both arranged in the horizontal direction.

[0047] like Figure 4 The figure is used to illustrate the principle of air treatment of the unit and the parameters of the air state point after treatment, where W is the outdoor air state point (temperature -15℃, relative humidity 50%).

[0048] TS1: Fresh air state point after full heat recovery (temperature 6.77°C, relative humidity 35%)

[0049] TS2: Fresh air state point after being heated by the air-cooled condensation section 13 (temperature 18.8°C, relative humidity 15.86%)

[0050] TS3: The state point after the primary and secondary fresh air are mixed (temperature -2.4°C, relative humidity 37.5%)

[0051] TS4: Fresh air state after being heated by the hot and cold coils (temperature 30.6°C, relative humidity 4.03%)

[0052] S: Fresh air isenthalpic humidification state point (temperature 24°C, relative humidity 20%)

[0053] N: Indoor air state point (temperature 20°C, relative humidity 30%)

[0054] Tp1: Air state point after exhaust air heat recovery (temperature 7.64°C, relative humidity 55.3%)

[0055] Tp2: The state point of the air after the exhaust air passes through the heat pump evaporator to release heat (temperature 1.64°C, relative humidity 84.1%)

[0056] ℇWinter air supply indoor heat and humidity ratio line

[0057] The air treatment principle is as follows: ① Fresh air treatment: The primary outdoor fresh air from point W is processed through the total heat recovery section 12 for heating and humidification. After the temperature and humidity increase, the state point is TS1. It is then heated to TS2 by the air-cooled condensing section 13. The primary fresh air at TS2 is then mixed with the secondary fresh air from point W. After mixing, the total air volume increases and the state point becomes TS3. It is then heated to TS4 by the hot and cold coil section 16. It then undergoes isenthalpic humidification to the supply air state point S before being delivered into the room. ② Exhaust air treatment: The indoor return air from point N is processed through the total heat exchanger for cooling and dehumidification. After cooling and dehumidification, the state point is Tp1. After heat release (temperature drops by 6°C) by the air-cooled evaporation section 23, the state point is Tp2 and it is discharged outdoors.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the implementation method and protection scope of the present invention. For those skilled in the art, it 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 deep heat recovery fresh air unit suitable for severe cold and cold areas, characterized by: include: Air supply system, wherein the air supply system is sequentially provided with a primary filter section, a heat recovery section, an air-cooled condensing section, a fresh air mixing section, a primary and secondary filter section, a hot and cold coil section, a humidification section and an air supply section; An exhaust system, wherein the exhaust system is sequentially provided with a return air section, the heat recovery section, an air-cooled evaporation section, an exhaust air section, and an exhaust section; The heat recovery section is a full heat exchanger, which is used for heat and moisture exchange between fresh air and exhaust air to increase the temperature and humidity of the fresh air and reduce the temperature and humidity of the exhaust air; The air supply system also includes: An outdoor fresh air main pipe is connected to the primary filter section via a primary air supply duct and to the fresh air mixing section via a secondary air supply duct, and both the primary air supply duct and the secondary air supply duct are provided with electric regulating valves, and the opening of the electric regulating valves is adjusted to adjust the amount of fresh air passing through the primary air supply duct / the secondary air supply duct.

2. The deep heat recovery fresh air unit suitable for severe cold and cold areas according to claim 1 is characterized in that: The exhaust system also includes: The indoor return air main pipe is connected to the return air section via a first return air duct and to the exhaust air section via a second return air duct. Both the first return air duct and the second return air duct are provided with exhaust airtight electric valves.

3. The deep heat recovery fresh air unit suitable for severe cold and cold areas according to claim 1 is characterized in that: The air-cooled condensing section has a first temperature sensor for detecting the temperature of the primary fresh air after preheating; the fresh air mixing section has a second temperature sensor for detecting the temperature after the primary and secondary fresh air are mixed; the air supply section has a third temperature sensor for detecting the fresh air supply temperature; and the air-cooled evaporating section has a fourth temperature sensor for detecting the exhaust air temperature.

4. The deep heat recovery fresh air unit suitable for severe cold and cold areas according to claim 1 is characterized in that: The air supply system also includes an air supply main pipe connected to the air supply section. The air supply main pipe is provided with an air supply regulating valve. The opening of the air supply regulating valve is controlled to adjust the indoor fresh air supply volume.

5. The deep heat recovery fresh air unit suitable for severe cold and cold areas according to claim 1 is characterized in that: The exhaust system further comprises an exhaust main pipe connected to the exhaust section. The exhaust main pipe is provided with an exhaust regulating valve. The opening of the exhaust regulating valve is controlled to adjust the amount of air exhausted to the outdoors.

6. The deep heat recovery fresh air unit suitable for severe cold and cold areas according to claim 1 is characterized in that: The air-cooled condensing section includes an air-cooled condenser, the air-cooled evaporating section includes an air-cooled evaporator and a compressor connected to each other, and the air-cooled condenser is connected to the air-cooled evaporator and the compressor respectively.

7. The deep heat recovery fresh air unit suitable for severe cold and cold areas according to claim 6 is characterized in that: A solenoid valve is further connected between the air-cooled condenser and the air-cooled evaporator.

8. The deep heat recovery fresh air unit suitable for severe cold and cold areas according to claim 1 is characterized in that: The air supply system and the air exhaust system are both arranged in the transverse direction.

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