Heat recovery device and air conditioning unit

Abstract

The utility model discloses a heat recovery device and an air conditioning unit. The heat recovery device comprises a pre-cooling section, at least one stage of cooling section and a reheating section which are sequentially arranged in the air supply direction. An outlet of the pre-cooling section is connected with an inlet of the reheating section, and an outlet of the reheating section is connected with an inlet of the pre-cooling section, so that a self-circulation loop is formed. The heat recovery device is preferably provided with two stages of cooling sections, namely a first-stage cooling section and a second-stage cooling section, and the first-stage cooling section and the second-stage cooling section work independently. The pre-cooling section and the reheating section are connected to form a self-circulation loop, heat of fresh air is recycled in the pre-cooling section to serve as a heat source for reheating, cold air obtained after cooling and dehumidification is reheated in the reheating section, cold energy of the cold air is recycled to serve as a cold source for pre-cooling, the energy utilization efficiency is effectively improved, and energy-saving operation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning units, in particular to a heat recovery device and an air conditioning unit. Background Art

[0002] In a centralized all-air air conditioning system, a fresh air unit is a common form. In summer, the common practice for the air conditioning system to achieve dehumidification is to lower the supply air temperature below the air dew point. However, the method of cooling and dehumidifying easily leads to too low an air outlet temperature of the indoor unit. In order to meet the constant temperature and humidity control, a reheater is then used to raise the temperature of the air after cooling and dehumidifying. However, the "cold and heat offset" process of reheating not only causes a large amount of energy consumption but also makes the air conditioning system structure complex and large.

[0003] There are already a wide variety of heat recovery devices in the prior art. Usually, waste heat such as fresh air heat or condensation heat is recycled once. Although this method can reduce the energy consumption of the air conditioning unit to a certain extent, the low-temperature water generated after the heat recovery and utilization is not properly treated, resulting in waste of cooling capacity, and there is still a large room for improvement in energy utilization efficiency.

[0004] In addition, usually, the pre-cooling section or the cooling section that plays a role in cooling in the heat recovery device is connected to the chiller. It is necessary to additionally design heat recovery pipelines and valve parts for switching the flow direction, which are prone to failures and difficult to install and maintain.

[0005] Therefore, how to provide a heat recovery device and an air conditioning unit with higher energy utilization efficiency and more energy saving is a technical problem that the industry urgently needs to solve. Content of the Utility Model

[0006] In order to solve the defects of waste of cooling capacity and low energy utilization efficiency existing in the prior art, the utility model provides a heat recovery device and an air conditioning unit, which recover the heat of fresh air as the heat source for reheating, reheat the cold air after cooling treatment, and recover the cold capacity of the cold air as the cold source for pre-cooling, effectively improving the energy utilization efficiency and realizing energy-saving operation.

[0007] The technical solution adopted by the utility model is to design a heat recovery device, including: a pre-cooling section, at least one stage of cooling section, and a reheating section arranged in sequence along the air supply direction; the outlet of the pre-cooling section is connected to the inlet of the reheating section, and the outlet of the reheating section is connected to the inlet of the pre-cooling section to form a self-circulation loop.

[0008] Further, the cooling section is connected to the chiller, the pre-cooling section and the reheating section are not connected to the chiller, and the liquid in the self-circulation loop only circulates between the pre-cooling section and the reheating section.

[0009] Further, a liquid pump for providing the driving force for liquid circulation is installed in the self-circulation loop.

[0010] Furthermore, a circulation regulating valve is installed in the self - circulation loop.

[0011] Furthermore, the heat recovery device includes a first - stage cooling section and a second - stage cooling section, and the first - stage cooling section and the second - stage cooling section work independently.

[0012] Furthermore, the second - stage cooling section is located on the air outlet side of the first - stage cooling section, and the inlet liquid temperature of the second - stage cooling section is lower than the inlet liquid temperature of the first - stage cooling section.

[0013] Furthermore, cooling regulating valves are installed in both the first - stage cooling section and the second - stage cooling section.

[0014] The present utility model also provides an air - conditioning unit, which includes: a fresh - air section and the above - mentioned heat recovery device, and the heat recovery device is arranged on the air outlet side of the fresh - air section.

[0015] Furthermore, at least one filter section is provided on the air inlet side of the pre - cooling section.

[0016] Furthermore, the air - conditioning unit further includes: a supply - air section, the supply - air section is arranged on the air outlet side of the reheating section, and a supply - air fan is installed in the supply - air section to drive air to sequentially pass through the fresh - air section, the pre - cooling section, the cooling section, the reheating section, and the supply - air section.

[0017] Compared with the prior art, the present utility model has at least one of the following beneficial effects:

[0018] 1. The pre - cooling section and the reheating section are connected to form a self - circulation loop. The heat of the fresh air is recovered in the pre - cooling section as the heat source for reheating, and the reheating section reheats the cold air after cooling treatment, and the cold quantity of the cold air is recovered as the cold source for pre - cooling, effectively improving the energy utilization efficiency and realizing energy - saving operation;

[0019] 2. The self - circulation loop where the pre - cooling section and the reheating section are located circulates independently, without the need to design additional cold and heat sources, simplifying the connection structure of the air - conditioning unit and being easy for operation management and installation and maintenance;

[0020] 3. The first - stage cooling section and the second - stage cooling section are designed to cool and dehumidify the air, and then the cold quantity of the air after cooling and dehumidifying is recovered to pre - cool the fresh air. While optimizing the dehumidification effect, the multi - stage refrigeration efficiency is improved, and the air - conditioning unit operates in the most energy - saving way. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present utility model will be described in detail below in conjunction with embodiments and drawings, where:

[0022] Figure 1 is a schematic structural diagram of the heat recovery device of the present utility model;

[0023] Figure 2 is a schematic structural diagram of the self - circulation loop of the present utility model;

[0024] Figure 3 It is a schematic structural view of the double-stage cooling section of the present utility model;

[0025] Figure 4 It is a schematic structural view of the air conditioner unit of the present utility model;

[0026] Figure 5 It is an application schematic view of the air conditioner unit of the present utility model;

[0027] Description of the drawings: 1. Pre-cooling section; 11. Pre-cooling coil; 2. Cooling section; 21. First-stage cooling section; 211. First chilled water coil; 22. Second-stage cooling section; 221. Second chilled water coil; 3. Reheating section; 31. Reheating coil; 4. Liquid pump; 5. Circulation regulating valve; 6. Fresh air section; 7. Filter section; 8. Air supply section; 81. Air supply fan. Detailed implementation manners

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0029] As Figure 1 shown, the heat recovery device proposed by the present utility model includes a pre-cooling section 1, at least one-stage cooling section 2, and a reheating section 3. The pre-cooling section 1, the cooling section 2, and the reheating section 3 are arranged in sequence along the air supply direction. The fresh air is first pre-cooled by the pre-cooling section 1 to reduce the initial temperature of the fresh air, then dehumidified at low temperature by the cooling section 2, and finally heated and raised in temperature by the reheating section 3 to reach the temperature and humidity conditions meeting the use requirements.

[0030] As Figure 2 shown, the outlet of the pre-cooling section 1 is connected to the inlet of the reheating section 3, and the outlet of the reheating section 3 is connected to the inlet of the pre-cooling section 1 to form a self-circulation loop. The pre-cooling section 1 recovers the heat of the fresh air and sends the heated liquid to the reheating section 3. The reheating section 3 reheats the cold air after low-temperature dehumidification treatment. The reheating section recovers the cold quantity of the cold air and sends the cooled liquid back to the pre-cooling section 1.

[0031] The advantage of designing the self-circulation loop is to use the heat of the fresh air as the heat source for reheating and the cold quantity of the cold air as the cold source for pre-cooling, effectively improving the energy utilization efficiency and realizing energy-saving operation. Moreover, since the pre-cooling section 1 pre-cools the fresh air and reduces the initial temperature of the fresh air, while realizing the reuse of waste heat, the refrigeration efficiency of the air conditioner unit is improved.

[0032] It should be understood that the pre-cooling section 1 and the reheating section 3 are each designed with heat exchange coils through which liquid circulates internally. When air passes through, heat exchange occurs between the air and the liquid in the heat exchange coils, thereby achieving temperature reduction or increase. The heat exchange coil in the pre-cooling section 1 is called the pre-cooling coil 11, and the heat exchange coil in the reheating section 3 is called the reheating coil 31. The outlet of the pre-cooling section 1 mentioned in this article refers to the outlet of the pre-cooling coil 11, the inlet of the pre-cooling section 1 refers to the inlet of the pre-cooling coil 11, the outlet of the reheating section 3 refers to the outlet of the reheating coil 31, and the inlet of the reheating section 3 refers to the inlet of the reheating coil 31.

[0033] Generally speaking, the cooling section 2 is connected to a chiller. The main function of the chiller is to refrigerate and produce chilled water. The chilled water is transported to components that need to be cooled, such as the cooling section 2, to reduce the temperature of air or other media. The chiller operates through a refrigerant circulation system, transferring heat from a low-temperature object (such as chilled water) to a high-temperature object (such as outdoor air), thereby achieving the refrigeration effect. The cooling section 2 can also be called the surface cooling section, which is mainly responsible for air cooling and usually includes a chilled water coil. The chilled water generated by the chiller circulates in the coil. When air passes through the cooling section 2, heat exchange occurs between the air flow and the chilled water in the cooling section 2, thereby reducing the temperature of the air. After the chilled water exchanges heat with the air, it flows back to the chiller for recirculation.

[0034] In some embodiments of the present utility model, neither the pre-cooling section 1 nor the reheating section 3 is connected to the chiller, and the liquid in the self-circulation loop only circulates between the pre-cooling section 1 and the reheating section 3. That is to say, the liquid in the self-circulation loop circulates independently, using the heat of the fresh air as the heat source for reheating and the cold of the treated cold air as the cold source for pre-cooling, without the need for additional cold and heat sources. The inlets and outlets of the pre-cooling section 1 or the reheating section 3 do not need to be connected to the chiller through pipelines, simplifying the connection structure of the air conditioner unit and facilitating operation management and installation maintenance. This design of independent circulation is particularly suitable for application scenarios where the outdoor environment is relatively high and the air conditioner unit operates in the refrigeration state for a long time.

[0035] As Figure 1 、 2 shown, in order to enable the smooth operation of the self-circulation loop, a liquid pump 4 for providing the driving force for liquid circulation is installed in the self-circulation loop. By controlling the working state of the liquid pump 4, it can be ensured that the liquid in the self-circulation loop circulates stably and continuously. The liquid pump 4 can also be designed with variable speed or multiple gears to adjust the rotation speed of the liquid pump 4 to change the liquid flow rate, thereby matching the actual usage requirements.

[0036] As Figure 1 、 2As shown, in the preferred embodiment, a circulation regulating valve 5 is further installed in the self-circulation loop. The flow rate of the self-circulation loop can be accurately controlled through the circulation regulating valve 5 to ensure that the self-circulation loop operates according to the predetermined working conditions, improving stability and reliability. In case of emergency, such as when an abnormality occurs in the self-circulation loop (such as liquid pump failure, pipeline leakage, etc.), the liquid flow is cut off through the circulation regulating valve 5 to prevent the expansion of the abnormality and ensure the safety of the unit.

[0037] As Figure 3 As shown, in some embodiments of the present utility model, the heat recovery device includes a first-stage cooling section 21 and a second-stage cooling section 22. Both the first-stage cooling section 21 and the second-stage cooling section 22 are connected to the chiller, and the first-stage cooling section 21 and the second-stage cooling section 22 work independently. It should be understood that the first-stage cooling section 21 and the second-stage cooling section 22 are each designed with a cold water coil. The heat exchange coil of the first-stage cooling section 21 is called the first cold water coil 211, and the heat exchange coil of the second-stage cooling section 22 is called the second cold water coil 221. Both the first cold water coil 211 and the second cold water coil 221 are connected to the chiller.

[0038] Using two-stage cooling sections for hierarchical cooling can more effectively reduce the air temperature, thereby reducing the total required cooling capacity. This way of hierarchical cooling can more precisely control the refrigeration process compared to single-stage cooling, avoiding unnecessary energy consumption waste and having a higher energy efficiency ratio. Moreover, due to the design of two-stage cooling sections, the second-stage cooling section 22 is mainly used to further reduce the humidity of the air that has been cooled by the first-stage cooling section 21, which helps to improve the comfort of the indoor air, especially in regions or seasons with high humidity.

[0039] The two-stage cooling sections designed in the present utility model have high refrigeration capacity and good humidity control, and can better meet the air-conditioning requirements under different climate conditions. Whether it is in the high-temperature and high-humidity summer or in the spring and autumn seasons with large temperature differences, it can provide a stable air-conditioning effect. In addition, the two-stage cooling sections can also be flexibly configured and adjusted according to actual needs. For example, the operating state of the two-stage cooling sections can be adjusted according to the change of the indoor load to adapt to different working condition requirements.

[0040] As Figure 3As shown, for most application scenarios, the second-stage cooling section 22 is located on the air outlet side of the first-stage cooling section 21, and the inlet liquid temperature of the second-stage cooling section 22 is lower than that of the first-stage cooling section 21. Through the design of the two-stage cooling section, the air first passes through the first-stage cooling section 21 for preliminary cooling, and then enters the second-stage cooling section 22 for further cooling. This hierarchical cooling method enables each stage of the cooling section to more effectively utilize the energy of the refrigerant, thereby improving the overall refrigeration efficiency. In addition, for the design of the two-stage cooling section, the second-stage cooling section 22 also helps to reduce the humidity of the air. Because when the air temperature decreases, its relative humidity will increase, and the second-stage cooling section 22 further reduces the air temperature, making the water vapor in the air easier to condense into water and be discharged out of the system, thus reducing the indoor humidity.

[0041] In the preferred solution, cooling regulating valves are installed in both the first-stage cooling section 21 and the second-stage cooling section 22. By designing the cooling regulating valves, the flow rate of the cooling water or coolant passing through each stage of the cooling section can be precisely controlled, thereby achieving precise adjustment of the refrigeration capacity. This helps to adjust the refrigeration capacity output according to actual needs, avoid energy waste, and improve the overall refrigeration efficiency and dehumidification efficiency. In addition, during the operation of the air-conditioning unit, the indoor load may change with factors such as time, season, and human activities. By adjusting the opening degree of the cooling regulating valve, the refrigeration capacity output of each stage of the cooling section can be flexibly adjusted to adapt to different load requirements, which helps to maintain the stability and comfort of the indoor temperature and humidity.

[0042] It should be understood that the liquid in the pre-cooling section 1, the cooling section 2, and the reheating section 3 mentioned in this article can be water, or other media can be selected according to actual needs. The present utility model does not make special restrictions on this.

[0043] As Figure 4 shown, the present utility model also proposes an air-conditioning unit, including: a fresh air section 6 and the above-mentioned heat recovery device, and the heat recovery device is arranged on the air outlet side of the fresh air section 6. Fresh air is introduced from the fresh air section 6, and then flows to the pre-cooling section 1, is pre-cooled by the pre-cooling section 1 first to reduce the initial temperature of the fresh air, then undergoes low-temperature dehumidification by the cooling section 2, and finally is heated and raised in temperature by the reheating section 3 to reach the temperature and humidity conditions that meet the usage requirements.

[0044] The outlet of the pre-cooling section 1 is connected to the inlet of the reheating section 3, and the outlet of the reheating section 3 is connected to the inlet of the pre-cooling section 1 to form a self-circulation loop. The pre-cooling section 1 recovers the heat of the fresh air and sends the heated liquid to the reheating section 3. The reheating section 3 reheats the cold air after low-temperature dehumidification treatment, and the reheating section 3 recovers the cold quantity of the cold air and sends the cooled liquid back to the pre-cooling section 1.

[0045] The advantage of the heat recovery device of the air conditioner unit adopting a self - circulation loop is that the heat of the fresh air is used as the heat source for reheating, and the cold of the cold air is used as the cold source for precooling, effectively improving the energy utilization efficiency and realizing the energy - saving operation of the air conditioner unit. Moreover, since the precooling section 1 precools the fresh air, reducing the initial temperature of the fresh air, it realizes the reuse of waste heat while improving the refrigeration efficiency of the air conditioner unit.

[0046] In some embodiments of the present utility model, at least one - stage filter section 7 is provided on the air - inlet side of the precooling section 1. The advantage of designing the filter section 7 is that it can effectively block and filter out impurities such as dust and particulate matter in the air. If these impurities directly enter the precooling section 1 or subsequent equipment, they may affect the normal operation of the equipment and even cause equipment damage. The filter section 7 can also remove some pollutants in the air, such as dust and bacteria, thus improving the air quality entering the precooling section 1 and subsequent equipment and optimizing the indoor environment.

[0047] It should be understood that the filter section 7 can be selected and configured according to different environments and requirements. For example, in an environment with more dust, a filter section with higher filtration efficiency can be selected; in a place where a high - cleanliness environment is required, a combined multi - layer filtration method can be selected. By adjusting the number and filtration efficiency of the filter section 7, the air - quality requirements of different places and equipment can be met.

[0048] In some embodiments of the present utility model, the air conditioner unit further includes: a blowing section 8, the blowing section 8 is arranged on the air - outlet side of the reheating section 3, and a blower 81 for driving air to sequentially pass through the fresh - air section 6, the precooling section 1, the cooling section 2, the reheating section 3 and the blowing section 8 is installed in the blowing section 8.

[0049] By driving the air through each functional section in a fixed order by the blower 81, the orderliness and efficiency of air treatment are ensured. Each functional section performs specific treatment on the air. For example, the fresh - air section 6 introduces fresh air, the precooling section 1 performs preliminary cooling, the cooling section 2 further reduces the temperature, the reheating section 3 adjusts the air temperature as needed, and finally the blowing section 8 sends the treated air into the room. The air can make full use of the resources of each functional section to achieve the best treatment effect.

[0050] As Figure 5 shown, for the sake of easy understanding, a detailed description will be given below with an application example of the present utility model.

[0051] The inlet and outlet water temperatures of each functional section can be adjusted according to the actual needs of users. Initially, the inlet water temperature of the precooling section 1 is set to 15 °C and the outlet water temperature is set to 25 °C. Initially, the inlet water temperature of the first-stage cooling section 21 is set to 8 °C and the outlet water temperature is set to 15 °C. Initially, the inlet water temperature of the second-stage cooling section 22 is set to 5 °C and the outlet water temperature is set to 11 °C. Initially, the inlet water temperature of the reheating section 3 is set to 25 °C and the outlet water temperature is set to 15 °C.

[0052] Fresh air at 33 °C is introduced from the fresh air section 6 and then exchanges heat with the 15 °C cold water in the precooling section 1, raising the outlet water temperature of the precooling section 1 to 25 °C and reducing the fresh air temperature to 27 °C. If the fresh air inlet condition changes, the opening of the cooling regulating valve of the cooling section 2 is adjusted, and the outlet air temperature of the first-stage cooling section 21 is controlled at 17 °C, and the outlet air temperature of the second-stage cooling section 22 is controlled at 8 °C. This process improves the efficiency of multi-stage refrigeration of the unit while recovering heat. The reheating section 3 of the self-circulating heat recovery device is located after the second-stage cooling section 22 and uses the recovered heat energy of the fresh air as the heat source for reheating. Its 25 °C water exchanges heat with the 8 °C treated fresh air flowing out after being cooled by the second-stage cooling section 22, reheating the 8 °C treated fresh air to 18 °C, and sending the constant temperature and constant humidity dry treated fresh air into the air-conditioned room through the air supply section 8. At this time, the temperature of the water in the reheating section 3 drops to 15 °C and returns to the inlet of the precooling section 1 through the action of the liquid pump 4 to continue the self-circulating process described above.

[0053] For the adjustment logic of the two-stage cooling section, in some embodiments of the present invention, the first-stage cooling section 21 is preferentially turned on, and PID control is performed based on the target moisture content dm and the detected supply air moisture content ds. When the opening of the cooling regulating valve of the first-stage cooling section 21 is less than the first set opening (for example, 50%) and can meet the demand, the inlet water temperature of the first-stage cooling section 21 is raised by the first set temperature (for example, 1 °C). When the opening of the cooling regulating valve of the first-stage cooling section 21 reaches 100% and still does not meet the demand after continuously detecting for the first set time (for example, 10 seconds), the inlet water temperature of the first-stage cooling section 21 is lowered by the first set temperature (for example, 1 °C).

[0054] When the water temperature of the first-stage cooling section 21 has been adjusted to the lowest level and the cooling regulating valve of the first-stage cooling section 21 is opened to 100%, and the demand is still not met after continuously detecting for the first set time (e.g., 10 seconds), the second-stage cooling section 22 is opened. PID control is performed based on the target moisture content dm and the detected supply air moisture content ds. When the opening degree of the cooling regulating valve of the second-stage cooling section 22 is less than the second set opening degree (e.g., 50%) and the demand can be satisfied, the inlet water temperature of the second-stage cooling section 22 is raised by the second set temperature (e.g., 1°C). When the cooling regulating valve of the second-stage cooling section 22 is opened to 100% and the demand is still not met after continuously detecting for the second set time (e.g., 10 seconds), the inlet water temperature of the second-stage cooling section 22 is lowered by the second set temperature (e.g., 1°C). Under the combined action of the two-stage cooling sections, the refrigerating capacity of the cooling sections is adjusted step by step to effectively meet the target temperature and humidity control and achieve constant temperature and humidity supply.

[0055] The heat recovery device of the present utility model simplifies the complex structure of the traditional reheater, uses the recovered heat as the heat source for reheating, reduces the energy consumption of the reheater, and at the same time recovers the excess cold generated by cooling and dehumidifying as the cold source for precooling, reduces the initial temperature of the fresh air, improves the refrigeration efficiency of the air-conditioning unit, and realizes energy-saving operation under the condition of meeting the indoor use requirements.

[0056] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. For the actions and steps in the devices and methods shown in the specification and drawings, as long as there is no specific limitation on the execution order, and as long as the output of the previous process is not used in the subsequent process, they can be implemented in any order. The similar sequential terms used for convenience of description do not mean that they must be implemented in such an order.

[0057] For technologies, methods, and devices known to those of ordinary skill in the relevant fields, they may not be discussed in detail, but in appropriate cases, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0058] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Heat recovery device, including: A precooling section, at least one cooling section, and a reheating section are sequentially arranged along the air supply direction; characterized in that the outlet of the precooling section is connected to the inlet of the reheating section, and the outlet of the reheating section is connected to the inlet of the precooling section to form a self-circulating loop.

2. The heat recovery device according to claim 1, characterized in that: The cooling section is connected to a chiller, while the pre-cooling section and the reheating section are not connected to the chiller, and the liquid in the self-circulating loop circulates only between the pre-cooling section and the reheating section.

3. The heat recovery device according to claim 1, characterized in that: The self-circulating loop is equipped with a liquid pump for providing liquid circulation power.

4. The heat recovery device according to claim 1, characterized in that: The self-circulating loop is equipped with a circulation regulating valve.

5. The heat recovery device according to any one of claims 1 to 4, characterized in that: The heat recovery device comprises a first-stage cooling section and a second-stage cooling section, and the first-stage cooling section and the second-stage cooling section work independently.

6. The heat recovery device according to claim 5, characterized in that: The second-stage cooling section is located at the air outlet side of the first-stage cooling section, and the liquid inlet temperature of the second-stage cooling section is lower than the liquid inlet temperature of the first-stage cooling section.

7. The heat recovery device according to claim 5, characterized in that: The first-stage cooling section and the second-stage cooling section are both equipped with cooling regulating valves.

8. An air conditioning unit, characterized in that: include: A fresh air section and a heat recovery device as described in any one of claims 1 to 7, wherein the heat recovery device is arranged on the air outlet side of the fresh air section.

9. The air conditioning unit according to claim 8, characterized in that: At least one level of filtering section is provided on the air inlet side of the precooling section.

10. The air conditioning unit according to claim 8, characterized in that: Also includes: An air supply section is arranged at the air outlet side of the reheat section, and the air supply section is equipped with an air blower that drives air to pass through the fresh air section, the precooling section, the cooling section, the reheat section and the air supply section in sequence.

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