Integral three-medium heat exchanger temperature regulating dehumidifying dryer

Abstract

This utility model relates to the field of air conditioning technology and provides an integrated three-medium heat exchanger temperature-regulating dehumidifier and dryer, including: a heat pump system, a refrigerant system, an outdoor air duct cavity, and an indoor air duct cavity. An indoor heat exchanger and a blower are installed within the indoor air duct cavity, located upstream and downstream of the airflow within the cavity, respectively. A first air passage and a second air passage are formed in parallel between the indoor heat exchanger and the blower, each equipped with a first air valve and a three-medium heat exchanger. A heat recovery heat exchanger is also provided, with its first and second ends positioned between the indoor air duct cavity air inlet and the indoor heat exchanger, and between the indoor heat exchanger and the three-medium heat exchanger, respectively. This utility model replaces the two condensers of a traditional dehumidifier with a single three-medium heat exchanger, simplifying the refrigerant system piping; it allows adjustment of the airflow and refrigerant flow rate through the three-medium heat exchanger to change the reheat amount, achieving wide-range supply air temperature control; and it reduces heat loss through heat recovery, improving the energy efficiency ratio.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning, and in particular to an integrated three-medium heat exchanger temperature-regulating dehumidifying dryer. Background Technology

[0002] Conventional dehumidifiers use an evaporator in a refrigeration cycle to dehumidify the air through condensation, and then use a condenser to reheat the dehumidified air. Because the condenser capacity of the refrigeration cycle is larger than the evaporator capacity, and the evaporator side and condenser side handle the total heat and sensible heat load of the air respectively, the supply air temperature of this type of dehumidifier will be significantly higher than the inlet air temperature. The temperature of the controlled room cannot be well guaranteed, and other auxiliary heat dissipation equipment is required.

[0003] To address this issue, one type of temperature-controlled dehumidifier uses two condensers. Condenser I reheats the dehumidified air, while Condenser II discharges excess condensation waste heat from the refrigeration cycle to the outside. By adjusting the capacity of the two condensers, the reheat capacity is adjusted to bring the supplied air to the required temperature. Condenser II can be divided into two types: air-cooled (e.g., Han Xu, Li Yongmao, Jin Feng. Optimization Scheme and Experimental Study on Refrigerant Regulation in Parallel Temperature-Controlled Dehumidifiers. Journal of Refrigeration, 2012) and water-cooled (e.g., Fang Fang. Research on Low Air Volume Dehumidifiers under High Temperature and High Humidity Environments. Huazhong University of Science and Technology, 2016). Among them, the water-cooled type has higher energy efficiency due to its lower condensation temperature.

[0004] In addition, some buildings (such as tobacco factories) require a drying mode to heat the indoor air in addition to indoor temperature and humidity control. Therefore, dehumidifying dryers have been proposed (Ye Zhicheng. Performance Optimization and Analysis of a Novel Heat Pump Dehumidifying Drying System in the Tobacco Curing Process. Xi'an University of Architecture and Technology, 2019). However, although temperature-controlled dehumidifying dryers using two condensers can efficiently regulate the temperature and humidity of the supplied air, the refrigerant piping and system control strategies are complex.

[0005] Patent application number 202220519050.0 discloses a three-medium condenser temperature-regulating dehumidifier, which uses a three-medium heat exchanger as the condenser to replace the original two condensers, simplifying the system structure. However, this system lacks a four-way valve, making it unable to achieve a drying mode to heat the indoor air. Furthermore, the air in this machine first passes through the evaporator for cooling and dehumidification, and then through the condenser for heating, resulting in a net effect of heat and cold canceling each other out, leading to high energy consumption. Further improvements are needed. Utility Model Content

[0006] This utility model provides an integrated three-medium heat exchanger temperature-regulating dehumidifying dryer to solve the defects of existing temperature-regulating dehumidifying drying technologies, such as difficulty in adjusting the supply air temperature, complex refrigerant system structure, and severe heat and cold offset. It realizes the control of the supply air temperature after dehumidification, simplifies the piping of the refrigerant system, and reduces heat and cold offset through heat recovery, thus significantly reducing system energy consumption.

[0007] The integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to an embodiment of the present invention includes a heat pump system, a refrigerant system, an outdoor air duct cavity, and an indoor air duct cavity. The heat pump system includes an indoor heat exchanger, a compressor, a refrigerant channel of the three-medium heat exchanger, a four-way valve, and a throttling device connected through a refrigerant pipeline, forming a refrigerant circulation loop. The refrigerant system includes an outdoor heat exchanger and a refrigerant pump connected through a refrigerant pipeline, forming a circulation loop with the refrigerant system and the refrigerant channel of the three-medium heat exchanger. The outdoor air duct cavity is equipped with the outdoor heat exchanger and several outdoor fans, allowing outdoor air to enter the outdoor air duct cavity and pass through the outdoor heat exchanger and the outdoor fans in sequence.

[0008] The indoor air duct cavity is equipped with an indoor heat exchanger, a three-medium heat exchanger, a first air valve, and a blower. The indoor heat exchanger and the blower are located upstream and downstream of the airflow in the indoor air duct cavity, respectively. A first air passage and a second air passage are formed in parallel between the indoor heat exchanger and the blower. The first air passage is equipped with the first air valve, and the second air passage is equipped with the three-medium heat exchanger.

[0009] Preferably, a second air valve is also provided in the second air passage.

[0010] Preferably, the refrigerant pump, compressor, four-way valve, and throttling device are located inside the outdoor air duct cavity; or, the refrigerant pump, compressor, four-way valve, and throttling device are located outside the outdoor air duct cavity.

[0011] Preferably, a heat recovery heat exchanger is also provided in the indoor air duct cavity, with the first end of the heat recovery heat exchanger placed between the air inlet of the indoor air duct cavity and the indoor heat exchanger, and the second end placed between the indoor heat exchanger and the three-medium heat exchanger.

[0012] Preferably, the refrigerant pump can regulate the refrigerant flow rate in the refrigerant pipeline.

[0013] Preferably, the opening degree of both the first air valve and the second air valve can be adjusted to adjust the ratio of the air volume flowing through the first air passage to the air volume flowing through the second air passage.

[0014] Preferably, a third air valve and a fourth air valve are also provided in the indoor air duct cavity, with the first end of the heat recovery heat exchanger placed side by side with the fourth air valve, and the second end of the heat recovery heat exchanger placed side by side with the third air valve.

[0015] Preferably, the heat recovery heat exchanger is a heat pipe heat exchanger.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the integrated three-medium heat exchanger temperature-regulating dehumidifying dryer provided in Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram of an operating mode of the integrated three-medium heat exchanger temperature-regulating dehumidifying dryer provided in Embodiment 1 of this utility model;

[0020] Figure 3 This is a schematic diagram of another operating mode of the integrated three-medium heat exchanger temperature-regulating dehumidifying dryer provided in Embodiment 1 of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the integrated three-medium heat exchanger temperature-regulating dehumidifying dryer provided in Embodiment 2 of this utility model;

[0022] Figure label:

[0023] 1. Outdoor fan; 2. Outdoor heat exchanger; 3. Refrigerant pump; 4. Compressor; 5. Four-way valve; 6. Throttling device; 7. Three-medium heat exchanger; 8. Indoor heat exchanger; 9. First air valve; 10. Second air valve; 11. Blower; 12. Heat recovery heat exchanger; 13. Third air valve; 14. Fourth air valve; A. Outdoor air duct cavity; B. Indoor air duct cavity. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0027] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] The following description, with reference to the accompanying drawings, describes an integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to an embodiment of the present invention.

[0030] like Figure 1 As shown, the integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to an embodiment of this utility model includes an integrated three-medium heat exchanger temperature-regulating dehumidifying dryer, comprising a heat pump system, a refrigerant system, an outdoor air duct cavity A, and an indoor air duct cavity B; the heat pump system includes an indoor heat exchanger 8, a compressor 4, a refrigerant channel of a three-medium heat exchanger 7, a four-way valve 5, and a throttling device 6 connected by refrigerant pipes, forming a refrigerant circulation loop; the refrigerant system includes an outdoor heat exchanger 2 and a refrigerant pump 3 connected by refrigerant pipes, forming a circulation loop with the refrigerant system and the refrigerant channel of the three-medium heat exchanger 7; the outdoor air duct cavity A is provided with the outdoor heat exchanger 2 and several outdoor fans 1, allowing outdoor air to enter the outdoor air duct cavity A and pass through the outdoor heat exchanger 2 and the outdoor fans 1 in sequence;

[0031] The indoor air duct cavity B is equipped with an indoor heat exchanger 8, a three-medium heat exchanger 7, a first air valve 9, and a blower 11. The indoor heat exchanger 8 and the blower 11 are located upstream and downstream of the airflow in the indoor air duct cavity B, respectively. A first air passage and a second air passage are formed in parallel between the indoor heat exchanger 8 and the blower 11. The first air valve 9 is provided on the first air passage, and the three-medium heat exchanger 7 is provided on the second air passage.

[0032] The integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to an embodiment of the present invention operates in two modes: temperature-regulating dehumidifying mode and drying mode.

[0033] like Figure 2 As shown, when operating the temperature and humidity control mode, the four-way reversing valve 5 is adjusted so that the indoor heat exchanger 8 and the three-medium heat exchanger 7 are the evaporator and condenser, respectively. The opening of the first air valve 9 and the second air valve 10 is adjusted to control the airflow of the first and second air passages. After the indoor air enters the indoor air duct cavity B, it first passes through the indoor heat exchanger 8. The indoor heat exchanger 8 treats the indoor air to the required supply air humidity by condensation and dehumidification. The air is then split into bypass air and heated air. The bypass air passes through the first air passage and the first air valve 9, while the heated air passes through the three-medium heat exchanger 7 and the second air valve 10, and is heated by the three-medium heat exchanger 7. After mixing, the heated air and bypass air flow into the supply fan 11, which delivers the mixed air into the room. Excess condenser waste heat from the heat pump system heats the refrigerant at the three-medium heat exchanger 7, and is then transferred to the outdoor heat exchanger 2 by the refrigerant pump 3. Outdoor air is then introduced by the outdoor fan 1, exchanges heat with the refrigerant at the outdoor heat exchanger 2, and is discharged outdoors.

[0034] To address the technical problem of controlling the supply air temperature in dehumidifiers in related technologies, this utility model's integrated three-medium heat exchanger temperature-regulating dehumidifier and dryer achieves precise control of the supply air temperature by adjusting the first air valve 9, the second air valve 10, and / or the refrigerant pump 3. It should be noted that the three media in the aforementioned three-medium heat exchanger 7 refer to refrigerant, air, and coolant. The three-medium heat exchanger 7 can simultaneously transfer heat to air and cooling water through the refrigerant circulating internally.

[0035] According to an embodiment of this utility model, in the process of temperature regulation and dehumidification of the integrated three-medium heat exchanger temperature-regulating dehumidifying dryer, on the one hand, the outdoor fan 1 introduces outdoor air to cool the refrigerant flowing in the refrigerant system to obtain a low-temperature refrigerant. In the three-medium heat exchanger, heat exchange occurs between the refrigerant, air and refrigerant. The refrigerant pump 3 can adjust the refrigerant flow rate in the refrigerant system, thereby indirectly adjusting the heat transfer ratio between the refrigerant transferring heat to the air and to the refrigerant, and thus adjusting the air reheat to a certain extent to achieve the regulation of the supply air temperature. On the other hand, the first air valve 9 and the second air valve 10 can adjust the airflow through the first air passage by adjusting their opening degree, thereby adjusting the airflow ratio between the bypass air and the heated air, and thus indirectly adjusting the heat transfer ratio between the refrigerant transferring heat to the air and to the refrigerant. That is, the air reheat can also be adjusted by adjusting the opening degree of the first air valve 9 and the second air valve 10 to achieve the regulation of the supply air temperature.

[0036] In summary, the integrated three-medium heat exchanger temperature-regulating dehumidifying dryer provided by this utility model, while ensuring the required moisture content of the supplied air, can adjust the airflow through the condenser via the first air valve 9 and the second air valve 10, and adjust the flow rate of the refrigerant water via the refrigerant pump 3, thereby changing the air reheat and achieving a wide range of supplied air temperature control.

[0037] In addition, compared with the traditional scheme of two condensers connected in series or parallel in a temperature-controlled dehumidifier, this utility model simplifies the piping of the refrigerant system and makes it easier to adjust the proportion of condensation waste heat used for reheating the air.

[0038] According to one embodiment of the present invention, the opening degree of the first air valve 9 and the second air valve 10 can adjust the ratio of the airflow through the first air passage to the airflow through the second air passage. That is, the first air valve 9 and the second air valve 10 can adjust the ratio of bypass air to heated air by adjusting their opening degree (i.e., degree of opening).

[0039] For example, when a user requests a higher supply air temperature, the first air valve 9 can be completely closed and the second air valve 10 can be fully opened. At this time, all the air flowing out from the indoor heat exchanger 8 enters the second air passage, and the three-medium heat exchanger 7 reheats all the air in the second air passage, thereby meeting the user's demand for a higher supply air temperature.

[0040] For example, when the user requires a suitable air supply temperature, the first air valve 9 and the second air valve 10 can be in a partially open state (i.e., the opening degree is greater than zero but less than 100%). At this time, the air flowing out from the indoor heat exchanger 8 is divided into bypass air and heated air. The bypass air passes through the first air valve 9, and the heated air passes through the three-medium heat exchanger 7 and is heated by it. The mixed airflow is discharged and reaches a suitable temperature to meet the user's requirements.

[0041] For example, when the user requests a lower supply air temperature, the first air valve 9 can be fully opened and the second air valve 10 can be fully closed. At this time, the proportion of bypass air flowing through the first air valve 9 to the total air volume increases, and no air flows through the three-medium heat exchanger 7, thereby meeting the user's requirement for a lower supply air temperature.

[0042] In addition, by adjusting the refrigerant flow rate of the refrigerant system through the refrigerant pump 3, the reheat can also be adjusted to a certain extent, thereby changing the supply air temperature.

[0043] For example, when the user requires a higher / lower supply air temperature, the refrigerant flow rate of the refrigerant system can be reduced / increased by adjusting the refrigerant pump 3. This reduces / increases the proportion of heat transferred from the refrigerant to the refrigerant, while increasing / decreasing the proportion of heat transferred from the refrigerant to the air, thereby meeting the user's requirement for a higher supply air temperature.

[0044] As can be seen from the above description of the first air valve 9, the second air valve 10, and the refrigerant system, for the integrated three-medium heat exchanger temperature-regulating dehumidifying dryer proposed in this utility model, the air supply temperature can be adjusted not only by adjusting the opening of the first air valve 9 and the second air valve 10, but also by adjusting the refrigerant pump 3. In this way, the air supply temperature can be adjusted in different ways, avoiding the unavailability of one adjustment method that would lead to the overall unadjustable air supply temperature, thus improving the safety performance of the device.

[0045] like Figure 3As shown, during the drying mode, the four-way reversing valve 5 is adjusted so that the indoor heat exchanger 8 and the three-medium heat exchanger 7 are the condenser and evaporator, respectively. The first air valve 9 is open, the second air valve 10 is closed, the first air passage is open, and the second air passage is closed. After the indoor air enters the indoor air duct cavity B, it first passes through the indoor heat exchanger 8. The indoor heat exchanger 8 heats the indoor air to the required supply air temperature. The air then flows along the first air passage through the first air valve 9 and into the blower 11, which delivers the air into the room. Outdoor air introduced by the outdoor fan 1 passes through the outdoor heat exchanger 2, exchanges heat with the refrigerant, and heats the refrigerant. This heat is then transferred to the three-medium heat exchanger 7 by the refrigerant pump 3, and transferred to the refrigerant in the heat pump system.

[0046] like Figure 4 As shown, in another embodiment of this utility model, a heat recovery heat exchanger 12 is also provided in the indoor air duct cavity B. The first end of the heat recovery heat exchanger 12 is placed between the air inlet of the indoor air duct cavity B and the indoor heat exchanger 8, and the second end is placed between the indoor heat exchanger 8 and the three-medium heat exchanger 7.

[0047] Inside the indoor air duct cavity B, a third air valve 13 and a fourth air valve 14 are also installed. The first end of the heat recovery heat exchanger 12 is placed side by side with the fourth air valve 14, and the second end of the heat recovery heat exchanger 12 is placed side by side with the third air valve 13. The heat recovery heat exchanger 12 is a heat pipe heat exchanger.

[0048] This utility model uses a heat recovery heat exchanger 12. When operating the temperature regulation and dehumidification mode, before the indoor air passes through the evaporator, the first end of the heat recovery heat exchanger pre-cools the air through the cold energy recovered at the second end, reducing the load on the evaporator and the heat-cold offsetting, thus significantly reducing the system energy consumption.

[0049] In summary, the integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to this utility model effectively overcomes the shortcomings of the prior art. It uses one three-medium heat exchanger 7 instead of two condensers, enabling simultaneous heat transfer from the refrigerant to both air and the secondary refrigerant, simplifying the piping connections of the refrigerant system. By adjusting the flow rate of the secondary refrigerant, the ratio of heat transfer from the refrigerant to air and to the secondary refrigerant is adjusted, thereby regulating the air reheat to a certain extent. Furthermore, by adjusting the airflow through the three-medium heat exchanger 7 via the first air valve 9 and the second air valve 10, the reheat of the supplied air can also be adjusted, thus regulating the supplied air temperature. In addition, the addition of a heat recovery heat exchanger 12 reduces the heat loss due to cooling, dehumidification, and reheating, significantly improving the system's energy efficiency ratio.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An integrated three-medium heat exchanger temperature-regulating dehumidifying dryer, characterized in that, It includes a heat pump system, a refrigerant system, an outdoor air duct cavity (A), and an indoor air duct cavity (B); The heat pump system includes an indoor heat exchanger (8), a compressor (4), a three-medium heat exchanger (7), a refrigerant channel, a four-way valve (5), and a throttling device (6) connected by refrigerant pipes, forming a refrigerant circulation loop; The refrigerant system includes an outdoor heat exchanger (2) and a refrigerant pump (3) connected by a refrigerant pipeline, forming a circulation loop with the refrigerant channel of the refrigerant system and the three-medium heat exchanger (7); The outdoor air duct cavity (A) is equipped with the outdoor heat exchanger (2) and several outdoor fans (1) so that outdoor air enters the outdoor air duct cavity (A) and passes through the outdoor heat exchanger (2) and the outdoor fans (1) in sequence. The indoor air duct cavity (B) is equipped with an indoor heat exchanger (8), a three-medium heat exchanger (7), a first air valve (9), and a blower (11). The indoor heat exchanger (8) and the blower (11) are located upstream and downstream of the air flow in the indoor air duct cavity (B), respectively. A first air passage and a second air passage are formed in parallel between the indoor heat exchanger (8) and the blower (11). The first air valve (9) is provided on the first air passage, and the three-medium heat exchanger (7) is provided on the second air passage.

2. The integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to claim 1, characterized in that, A second air valve (10) is also provided in the second air passage.

3. The integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to claim 1 or 2, characterized in that, The refrigerant pump (3), compressor (4), four-way valve (5) and throttling device (6) are located inside the outdoor air duct cavity (A); or, the refrigerant pump (3), compressor (4), four-way valve (5) and throttling device (6) are located outside the outdoor air duct cavity (A).

4. The integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to claim 1 or 2, characterized in that, A heat recovery heat exchanger (12) is also provided in the indoor air duct cavity (B). The first end of the heat recovery heat exchanger (12) is placed between the air inlet of the indoor air duct cavity (B) and the indoor heat exchanger (8), and the second end is placed between the indoor heat exchanger (8) and the three-medium heat exchanger (7).

5. The integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to claim 1 or 2, characterized in that, The refrigerant pump (3) regulates the flow rate of the refrigerant in the refrigerant pipeline.

6. The integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to claim 1 or 2, characterized in that, The opening degree of the first air valve (9) and the second air valve (10) can be adjusted to adjust the ratio of the air volume flowing through the first air passage to the air volume flowing through the second air passage.

7. The integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to claim 4, characterized in that, Inside the indoor air duct cavity (B), a third air valve (13) and a fourth air valve (14) are also provided. The first end of the heat recovery heat exchanger (12) is placed side by side with the fourth air valve (14), and the second end of the heat recovery heat exchanger (12) is placed side by side with the third air valve (13).

8. The integrated three-medium heat exchanger temperature-regulating dehumidifying dryer according to claim 7, characterized in that, The heat recovery heat exchanger (12) is a heat pipe heat exchanger.

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