Two-stage rotary dehumidification system based on heat pipe and control method

Abstract

The present invention relates to the technical field of dehumidification systems, and specifically to a two-stage rotary dehumidification system based on a heat pipe and a control method. The two-stage rotary dehumidification system includes a dehumidification flow path and a regeneration air flow path; the dehumidification flow path includes a surface cooler, a dehumidification zone of a first rotary dehumidifier, a first heat pipe evaporation section, a dehumidification zone of a second rotary dehumidifier, a second heat pipe evaporation section and a temperature regulator arranged in sequence; the regeneration air flow path includes a second heat pipe condensation section, a first regeneration heater, a regeneration zone of a second rotary dehumidifier, a first heat pipe condensation section, a second regeneration heater and a regeneration zone of a first rotary dehumidifier arranged in sequence. The two-stage rotary dehumidification system is suitable for high temperature and low temperature scenarios, and has a good energy-saving effect.

Description

Technical Field

[0001] The present invention relates to the technical field of dehumidification systems, and in particular to a two-stage rotary dehumidification system based on a heat pipe and a control method. Background Art

[0002] Rotary dehumidification is widely used in the field of dehumidification. Compared with condensation dehumidification and solution dehumidification, it is more suitable for large-scale dehumidification. Single-stage rotary dehumidifiers are often used in places with low relative humidity requirements, and two-stage rotary dehumidifiers are used in places with high relative humidity requirements. However, whether it is a single-stage rotary dehumidifier or a two-stage rotary dehumidifier, the heat required in the regeneration process is provided by electric heating, steam heating, etc., and the energy consumption on the regeneration side is relatively high. Most dehumidifiers only consider the dehumidification situation in summer, and do not consider the dehumidification mode in winter. The air temperature after dehumidification on the dehumidification side does not reach the supply air temperature, and needs to be cooled or heated by a heat exchanger for temperature adjustment. The Chinese invention patent with application number 202110515070.0 discloses a high-temperature heat pump hot water type low-temperature regeneration rotary dehumidification fresh air system, which includes a rotary dehumidification unit, which includes a fresh air duct, a regeneration duct, a fresh air fan, a fresh air fan, a regeneration fan, a dehumidification wheel, a heating coil, and at least two cold water coils separated from each other. The system uses the hot water unit of the high-temperature heat pump to provide heat for the heating coil, and the heat coil is used for the regeneration of the rotary dehumidifier, which has the advantages of stronger dehumidification capacity, low energy consumption, energy saving and high efficiency. However, due to the limited heat provided by the heat pump, the system can only be used for the regeneration of the rotary dehumidifier at summer temperatures. Therefore, it is necessary to expand the application of rotary dehumidifiers at winter temperatures. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a two-stage rotary dehumidification system based on a heat pipe and a control method, which can be applied to the regeneration of a rotary dehumidifier in high temperature and low temperature scenarios at the same time.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a two-stage rotary dehumidification system based on a heat pipe, comprising a dehumidification flow path and a regeneration air flow path;

[0005] The dehumidification flow path includes a surface cooler, a dehumidification zone of a first rotary dehumidifier, a first heat pipe evaporation section, a dehumidification zone of a second rotary dehumidifier, a second heat pipe evaporation section and a temperature regulator arranged in sequence;

[0006] The regeneration air flow path includes a second heat pipe condensation section, a first regeneration heater, a regeneration area of ​​a second rotary dehumidifier, a first heat pipe condensation section, a second regeneration heater and a regeneration area of ​​a first rotary dehumidifier which are arranged in sequence.

[0007] Another technical solution adopted by the present invention is: when the control method of the above-mentioned two-stage rotary dehumidification system based on heat pipes is controlled to the summer dehumidification mode, the surface cooler, the dehumidification zone of the first rotary dehumidifier, the first heat pipe evaporation section, the dehumidification zone of the second rotary dehumidifier, the second heat pipe evaporation section and the temperature regulator are turned on on the dehumidification flow path; the second heat pipe condensation section, the first regeneration heater, the regeneration zone of the second rotary dehumidifier, the first heat pipe condensation section, the second regeneration heater, and the regeneration zone of the first rotary dehumidifier are turned on on the regeneration air flow path.

[0008] The beneficial effects of the present invention are as follows: the two-stage rotary dehumidification system based on heat pipes of the present invention is suitable for high-temperature and low-temperature scenes, and has good energy-saving effect. The fresh air is dehumidified through the dehumidification flow path, and the dehumidification process passes through the dehumidification zone of the rotary dehumidifier twice. In order to improve the dehumidification efficiency, the fresh air is cooled by a surface cooler or the first heat pipe evaporation section before each rotary dehumidification; since the temperature of the fresh air increases after the rotary dehumidification, it will affect the ambient temperature after the fresh air is discharged, and the adjustment range of the temperature regulator is limited, so the fresh air dehumidified in the dehumidification zone of the second rotary dehumidifier is sent to the second heat pipe evaporation section for cooling, and then enters the temperature regulator to adjust the air supply temperature to meet the temperature requirements in different occasions.

[0009] The regeneration wind of the present invention realizes the regeneration of the regeneration zone of the rotary dehumidifier through the regeneration wind flow path. The regeneration process requires regeneration of the regeneration zone of the second rotary dehumidifier and the regeneration zone of the first rotary dehumidifier. Before each regeneration, the regeneration wind needs to pass through the heat pipe condensation section and the regeneration heater in sequence. The heat pipe condensation section can reduce the energy consumption of the regeneration heater. The regeneration heater can increase the temperature of the regeneration wind and improve the regeneration efficiency, so that the dehumidification system can be regenerated at the temperature of winter.

[0010] The heat pipe evaporation section and the heat pipe condensation section are two parts of the same heat pipe. Compared with a single heating or cooling device, they have better energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The figure shows a schematic structural diagram of a two-stage rotary dehumidification system based on a heat pipe in a specific embodiment of the present invention;

[0012] Figure 2 It is a structural schematic diagram of the winter dehumidification mode in the second embodiment of the present invention;

[0013] Figure 3 It is a schematic diagram of the structure of the spring and autumn dehumidification mode in the second embodiment of the present invention;

[0014] Description of labels:

[0015] 1. The first filter; 2. The surface cooler; 3. The dehumidification zone of the first rotary dehumidifier; 4. The first fan; 5. The first heat pipe evaporation section; 6. The dehumidification zone of the second rotary dehumidifier; 7. The second fan; 8. The second heat pipe evaporation section; 9. The temperature regulator; 10. The second filter; 11. The second heat pipe condensation section; 12. The first regeneration heater; 13. The regeneration zone of the second rotary dehumidifier; 14. The first heat pipe condensation section; 15. The second regeneration heater; 16. The regeneration zone of the first rotary dehumidifier; 17. The regeneration fan. DETAILED DESCRIPTION

[0016] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0017] Please refer to Figure 1 , a two-stage rotary dehumidification system based on a heat pipe, comprising a dehumidification flow path and a regeneration air flow path;

[0018] The dehumidification flow path includes a surface cooler, a dehumidification zone of a first rotary dehumidifier, a first heat pipe evaporation section, a dehumidification zone of a second rotary dehumidifier, a second heat pipe evaporation section and a temperature regulator which are sequentially arranged along the flow direction of fresh air;

[0019] The regeneration air flow path includes a second heat pipe condensation section, a first regeneration heater, a regeneration zone of a second rotary dehumidifier, a first heat pipe condensation section, a second regeneration heater and a regeneration zone of a first rotary dehumidifier, which are arranged in sequence along the regeneration air flow direction.

[0020] From the above description, it can be seen that the beneficial effects of the present invention are: the two-stage rotary dehumidification system based on heat pipes of the present invention includes two-stage rotary dehumidifiers, which can achieve deep dehumidification. After the fresh air is initially cooled by the surface cooler, it enters the dehumidification area of ​​the first rotary dehumidifier for preliminary dehumidification. After the fresh air is cooled, the dehumidification efficiency of the first rotary dehumidifier can be improved; after the dehumidified fresh air is cooled by the first heat pipe evaporation section, it enters the dehumidification area of ​​the second rotary dehumidifier for deep dehumidification, which can improve the dehumidification efficiency of the second rotary dehumidifier; since the temperature of the fresh air increases after rotary dehumidification, it will affect the ambient temperature after the fresh air is discharged, and the adjustment range of the temperature regulator is limited, so the fresh air dehumidified in the dehumidification area of ​​the second rotary dehumidifier enters the second heat pipe evaporation section for cooling, and then enters the temperature regulator to adjust the supply air temperature to meet the temperature requirements in different occasions.

[0021] The regeneration wind of the present invention realizes the regeneration of the regeneration zone of the rotary dehumidifier through the regeneration wind flow path. During the regeneration process, the regeneration wind first passes through the condensation section of the second heat pipe for heating, which can reduce the energy consumption of the first-stage regeneration heater, and then is heated to the regeneration temperature by the first-stage regeneration heater to enter the regeneration zone of the second rotary dehumidifier, which can improve the regeneration efficiency of the regeneration zone of the second rotary dehumidifier; the air temperature after the first regeneration has decreased and the humidity has increased, so the first heat pipe condensation section and the second-stage regeneration heater are used to heat the air and then enter the regeneration zone of the first rotary dehumidifier for regeneration, which is suitable for high temperature and low temperature scenes. In this system, the cooling effect of the heat pipe evaporation section and the heating effect of the heat pipe condensation section are fully utilized. Compared with a single heat pump or heat pipe, the heat exchange efficiency is higher and the energy saving is more significant; and because the second heat pipe and the first heat pipe can achieve different temperatures respectively, the temperature of the first heat pipe condensation section can be set higher than the second heat pipe condensation section to achieve secondary regeneration of the air with higher humidity after the first regeneration.

[0022] Furthermore, the dehumidification flow path also includes a first filter, a first fan and a second fan. The first filter, the surface cooler, the dehumidification zone of the first rotary dehumidifier, the first fan, the first heat pipe evaporation section, the dehumidification zone of the second rotary dehumidifier, the second fan, the second heat pipe evaporation section and the temperature regulator are arranged in sequence along the air supply direction of the dehumidification flow path.

[0023] From the above description, it can be seen that due to the large resistance of the two-stage rotary dehumidifier, only one fan is set, the fan pressure head is insufficient, and the air path is not smooth. Therefore, the first fan is set after the dehumidification area of ​​the first rotary dehumidifier, and the second fan is set in the dehumidification area of ​​the second rotary dehumidifier to make the air path smooth. The first filter can remove impurities in the fresh air to prevent impurities from affecting the life of the two-stage rotary dehumidification system.

[0024] Furthermore, the regeneration air flow path also includes a second filter and a regeneration fan, and the second filter, the second heat pipe condensation section, the first regeneration heater, the regeneration area of ​​the second rotary dehumidifier, the first heat pipe condensation section, the second regeneration heater, the regeneration area of ​​the first rotary dehumidifier and the regeneration fan are arranged in sequence along the air supply direction of the regeneration air.

[0025] Furthermore, the first heat pipe evaporation section and the first heat pipe condensation section constitute a first heat pipe, the second heat pipe evaporation section and the second heat pipe condensation section constitute a second heat pipe, and both the first heat pipe and the second heat pipe are gravity heat pipes.

[0026] From the above description, it can be seen that the gravity heat pipe has high heat transfer efficiency and high temperature in the condensation section, which can greatly save the energy consumption of the regeneration heater.

[0027] Another technical solution adopted by the present invention is: the control method (dehumidification method) of the above-mentioned two-stage rotary dehumidification system based on heat pipes, when controlled to the summer dehumidification mode, opens the surface cooler, the dehumidification zone of the first rotary dehumidifier, the first heat pipe evaporation section, the dehumidification zone of the second rotary dehumidifier, the second heat pipe evaporation section and the temperature regulator on the dehumidification flow path; opens the second heat pipe condensation section, the first regeneration heater, the regeneration zone of the second rotary dehumidifier, the first heat pipe condensation section, the second regeneration heater, and the regeneration zone of the first rotary dehumidifier on the regeneration air flow path.

[0028] From the above description, it can be seen that the summer dehumidification mode is suitable for operation under summer fresh air dehumidification conditions or high temperature and high humidity. The summer dehumidification mode dehumidifies air with a temperature above 30°C and a humidity above 30%.

[0029] Furthermore, when the dehumidification mode is adjusted to winter, the surface cooler, the dehumidification zone of the first rotary dehumidifier, the first heat pipe evaporation section and the temperature regulator are turned on in the dehumidification flow path; the dehumidification zone of the second rotary dehumidifier and the second heat pipe evaporation section are turned off;

[0030] The regeneration air flow path opens the first heat pipe condensation section, the second regeneration heater and the regeneration zone of the first rotary dehumidifier; closes the second heat pipe condensation section, the first regeneration heater and the regeneration zone of the second rotary dehumidifier;

[0031] The regeneration zone of the first rotary dehumidifier is connected to the surface cooler.

[0032] From the above description, it can be seen that the winter dehumidification mode is suitable for the winter environment where the fresh air temperature is low, but the humidity in the air does not meet the air supply dew point requirement, and dehumidification is still required. The winter dehumidification mode dehumidifies the air with a fresh air temperature between 0 and 15°C and a humidity higher than 30%. Since the fresh air temperature is low and the wet load under winter conditions is low, there is no need to cool and dehumidify the fresh air multiple times, and it can be dehumidified only by the first rotary dehumidifier. Since the fresh air temperature is low in winter, directly entering the rotary wheel may cause the rotary wheel to freeze, so it needs to be mixed with the regeneration air with a higher temperature before entering the dehumidification area of ​​the first rotary dehumidifier for dehumidification.

[0033] Furthermore, when the dehumidification mode is adjusted to spring and autumn, the surface cooler, the dehumidification zone of the first rotary dehumidifier and the temperature regulator are turned on in the dehumidification flow path; the first heat pipe evaporation section, the dehumidification zone of the second rotary dehumidifier and the second heat pipe evaporation section are turned off;

[0034] The regeneration air flow path opens the secondary regeneration heater and the regeneration zone of the first rotary dehumidifier; and closes the second heat pipe condensation section, the primary regeneration heater, the regeneration zone of the second rotary dehumidifier and the first heat pipe condensation section.

[0035] From the above description, we can know that the spring and autumn dehumidification mode is suitable for the spring and autumn fresh air temperature between the higher temperature in summer and the lower temperature in winter. Therefore, there is no need for heat pipes to cool or heat up. The surface cooler and regeneration heater can get the appropriate dehumidification temperature and regeneration temperature. The spring and autumn dehumidification mode is for fresh air temperature between 15 and 25 degrees Celsius and humidity above 30%.

[0036] Please refer to Figure 1 Embodiment 1 of the present invention is: a two-stage rotary dehumidification system based on heat pipes, comprising a first filter 1, a surface cooler 2, a dehumidification zone 3 of a first rotary dehumidifier, a first fan 4, a first heat pipe evaporation section 5, a dehumidification zone 6 of a second rotary dehumidifier, a second fan 7, a second heat pipe evaporation section 8, a temperature regulator 9, a second filter 10, a second heat pipe condensation section 11, a first regeneration heater 12, a regeneration zone 13 of a second rotary dehumidifier, a first heat pipe condensation section 14, a second regeneration heater 15, a regeneration zone 16 of a first rotary dehumidifier and a regeneration fan 17; the first heat pipe evaporation section 5 and the first heat pipe condensation section 14 constitute a first heat pipe, the second heat pipe evaporation section 8 and the second heat pipe condensation section 11 constitute a second heat pipe, and the first heat pipe and the second heat pipe are both gravity heat pipes.

[0037] The first filter 1, the surface cooler 2, the dehumidification zone 3 of the first rotary dehumidifier, the first fan 4, the first heat pipe evaporation section 5, the dehumidification zone 6 of the second rotary dehumidifier, the second fan 7, the second heat pipe evaporation section 8 and the temperature regulator 9 are arranged in sequence along the fresh air flow direction to form a dehumidification flow path.

[0038] The second filter 10, the second heat pipe condensation section 11, the first regeneration heater 12, the regeneration zone 13 of the second rotary dehumidifier, the first heat pipe condensation section 14, the second regeneration heater 15, the regeneration zone 16 of the first rotary dehumidifier and the regeneration fan 17 are arranged in sequence along the regeneration wind flow direction to form a regeneration wind flow path.

[0039] Embodiment 2 of the present invention is: a control method for the above-mentioned two-stage rotary dehumidification system based on heat pipes: by controlling the opening and connection of each device in the energy-saving rotary dehumidification system, different temperature and humidity modes are controlled, and specifically three modes can be controlled: summer dehumidification mode, winter dehumidification mode, and spring and autumn dehumidification mode:

[0040] Please refer to Figure 1The summer dehumidification mode dehumidifies the air with a temperature above 30°C and a humidity above 30%. When the summer dehumidification mode is adjusted, the first filter 1, the surface cooler 2, the dehumidification zone 3 of the first rotary dehumidifier, the first fan 4, the first heat pipe evaporation section 5, the dehumidification zone 6 of the second rotary dehumidifier, the second fan 7, the second heat pipe evaporation section 8 and the temperature regulator 9 are turned on the dehumidification flow path; the second filter 10, the second heat pipe condensation section 11, the first regeneration heater 12, the regeneration zone 13 of the second rotary dehumidifier, the first heat pipe condensation section 14, the second regeneration heater 15, the regeneration zone 16 of the first rotary dehumidifier and the regeneration fan 17 are turned on the regeneration air flow path.

[0041] Please refer to Figure 2 The winter dehumidification mode dehumidifies the air with a fresh air temperature between 0 and 15°C and a humidity higher than 30%. When the winter dehumidification mode is adjusted, the first filter 1, the surface cooler 2, the dehumidification zone 3 of the first rotary dehumidifier, the first fan 4, the first heat pipe evaporation section 5 and the temperature regulator 9 are turned on in the dehumidification flow path; the dehumidification zone 6, the second fan 7 and the second heat pipe evaporation section 8 of the second rotary dehumidifier are turned off;

[0042] The regeneration air flow path opens the second filter 10, the first heat pipe condensing section 14, the second regeneration heater 15, the regeneration zone 16 of the first rotary dehumidifier and the regeneration fan 17; closes the second heat pipe condensing section 11, the first regeneration heater 12 and the regeneration zone 13 of the second rotary dehumidifier;

[0043] The regeneration zone 16 of the first rotary dehumidifier is connected to the surface cooler 2.

[0044] Please refer to Figure 3 The spring and autumn dehumidification mode is for dehumidifying air with a fresh air temperature between 15-25°C and a humidity higher than 30%. When the spring and autumn dehumidification mode is adjusted, the first filter 1, the surface cooler 2, the first fan 4 and the temperature regulator 9 of the dehumidification zone 3 of the first rotary dehumidifier are turned on in the dehumidification flow path; the first heat pipe evaporation section 5, the dehumidification zone 6 of the second rotary dehumidifier, the second fan 7 and the second heat pipe evaporation section 8 are turned off;

[0045] The regeneration air flow path opens the second filter 10, the secondary regeneration heater 15, the regeneration zone 16 of the first rotary dehumidifier and the regeneration fan 17; and closes the second heat pipe condensation section 11, the primary regeneration heater 12, the regeneration zone 13 of the second rotary dehumidifier and the first heat pipe condensation section 14.

[0046] The operation process of the second embodiment is as follows:

[0047] Summer dehumidification mode is suitable for operation under summer fresh air dehumidification conditions or high temperature and high humidity. In this mode, the fresh air passes through the first filter 1 and enters the surface cooler 2 for preliminary cooling, and then enters the dehumidification zone 3 of the first rotary dehumidifier under the action of the first fan 4. The temperature of the fresh air after dehumidification rises, and after cooling through the first heat pipe evaporation section 5, it enters the dehumidification zone 6 of the second rotary dehumidifier under the action of the second fan 7 for deep dehumidification. The air after deep dehumidification passes through the second heat pipe evaporation section 8 for cooling, enters the temperature regulator 9 to adjust to the specified room temperature, and then is sent to the specified space. The regeneration air passes through the second filter 10 and enters the second heat pipe condensation section 11 and the first regeneration heater 12 for two heatings, and then enters the regeneration zone 13 of the second rotary dehumidifier for regeneration. The humidity of the regenerated air is relatively high and the temperature is reduced. After being heated twice through the first heat pipe condensation section 14 and the second regeneration heater 15, it enters the regeneration zone 16 of the first rotary dehumidifier for regeneration, and is finally discharged under the action of the regeneration fan 17.

[0048] The winter dehumidification mode is suitable for the scenario where the fresh air temperature is low in the winter environment, but the humidity in the air does not meet the air supply dew point requirement, and dehumidification is still required. Since the fresh air temperature is low and the wet load under winter conditions is low, the fresh air does not need to be cooled and dehumidified multiple times, and it can be dehumidified only through the dehumidification zone 3 of the first rotary dehumidifier. In this mode, the fresh air temperature is low, and directly entering the rotor may cause the rotor to freeze. Therefore, the fresh air is mixed with the higher temperature regeneration air from the regeneration fan 17 and then passes through the first filter 1 to enter the surface cooler 2 for preliminary cooling, and then enters the dehumidification zone 3 of the first rotary dehumidifier under the action of the first fan 4. The dehumidified fresh air passes through the first heat pipe evaporation section 5 and the temperature regulator 9 in turn to adjust to the specified temperature of the room and then is sent to the specified space. The regeneration air passes through the second filter 10 and enters the first heat pipe condensation section 14 and the secondary regeneration heater 15 in turn for two heatings, and then enters the regeneration zone 16 of the first rotary dehumidifier to regenerate it, and finally the regeneration air is discharged under the action of the regeneration fan 17.

[0049] The spring and autumn dehumidification mode is suitable for spring and autumn when the fresh air temperature is between the higher temperature in summer and the lower temperature in winter. There is no need for heat pipes to cool or heat up. The appropriate dehumidification temperature and regeneration temperature can be obtained under the action of the surface cooler 2 and the regeneration heater. The fresh air passes through the first filter 1 and enters the surface cooler 2 for preliminary cooling, and then enters the dehumidification area 3 of the first rotary dehumidifier under the action of the first fan 4. The dehumidified fresh air is adjusted to the specified room temperature by the temperature regulator 9 and then sent to the specified space. The regeneration air passes through the second filter 10 and enters the secondary regeneration heater 15 for heating, and then enters the regeneration area 16 of the first rotary dehumidifier to regenerate it. Finally, the regeneration air is discharged under the action of the regeneration fan 17.

[0050] In summary, the two-stage rotary dehumidification system based on heat pipes provided by the present invention has the following advantages:

[0051] 1. Use a surface cooler or the first heat pipe evaporator section to cool the fresh air before each rotary dehumidification to improve the dehumidification efficiency.

[0052] 2. Before each regeneration, the regeneration air needs to pass through the heat pipe condensation section and the regeneration heater in turn. The heat pipe condensation section can reduce the energy consumption of the regeneration heater, and the regeneration heater can increase the temperature of the regeneration air and improve the regeneration efficiency, so that the dehumidification system can be regenerated at winter temperatures.

[0053] 3. In this system, the cooling effect of the heat pipe evaporation section and the heating effect of the heat pipe condensation section are fully utilized. Compared with a single heat pump or heat pipe, the heat exchange efficiency is higher and the energy saving is more significant.

[0054] 4. The system has more flexible regeneration temperature adjustment capabilities. The two heat pipes in the system can adjust the working temperature to match the temperature required for regeneration heating.

[0055] 5. The dehumidification system has multiple operating modes, which can meet the dehumidification needs of various situations and has a wider range of applications.

[0056] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a two-stage rotary dehumidification system based on a heat pipe, characterized in that: The two-stage rotary dehumidification system includes a dehumidification flow path and a regeneration air flow path; The dehumidification flow path includes a first filter, a surface cooler, a dehumidification zone of a first rotary dehumidifier, a first fan, a first heat pipe evaporation section, a dehumidification zone of a second rotary dehumidifier, a second fan, a second heat pipe evaporation section and a temperature regulator arranged in sequence; The regeneration air flow path includes a second filter, a second heat pipe condensation section, a first regeneration heater, a regeneration area of ​​a second rotary dehumidifier, a first heat pipe condensation section, a second regeneration heater, a regeneration area of ​​a first rotary dehumidifier and a regeneration fan arranged in sequence; The first heat pipe evaporation section and the first heat pipe condensation section constitute a first heat pipe, the second heat pipe evaporation section and the second heat pipe condensation section constitute a second heat pipe, the first heat pipe and the second heat pipe are both gravity heat pipes; the temperature of the first heat pipe condensation section is higher than that of the second heat pipe condensation section; When the control is set to the summer dehumidification mode, the surface cooler, the dehumidification zone of the first rotary dehumidifier, the first heat pipe evaporation section, the dehumidification zone of the second rotary dehumidifier, the second heat pipe evaporation section and the temperature regulator are turned on in the dehumidification flow path; the second heat pipe condensation section, the first regeneration heater, the regeneration zone of the second rotary dehumidifier, the first heat pipe condensation section, the second regeneration heater, and the regeneration zone of the first rotary dehumidifier are turned on in the regeneration air flow path; When the control is set to winter dehumidification mode, the surface cooler, the dehumidification zone of the first rotary dehumidifier, the first heat pipe evaporation section and the temperature regulator are turned on in the dehumidification flow path; the dehumidification zone and the second heat pipe evaporation section of the second rotary dehumidifier are turned off; the first heat pipe condensation section, the second regeneration heater and the regeneration zone of the first rotary dehumidifier are turned on in the regeneration air flow path; the second heat pipe condensation section, the first regeneration heater and the regeneration zone of the second rotary dehumidifier are turned off; the regeneration zone of the first rotary dehumidifier is connected to the surface cooler; When the control is set to the spring and autumn dehumidification mode, the surface cooler, the dehumidification zone and the temperature regulator of the first rotary dehumidifier are turned on in the dehumidification flow path; the first heat pipe evaporation section, the dehumidification zone of the second rotary dehumidifier and the second heat pipe evaporation section are turned off; the secondary regeneration heater and the regeneration zone of the first rotary dehumidifier are turned on in the regeneration air flow path; the second heat pipe condensation section, the primary regeneration heater, the regeneration zone of the second rotary dehumidifier and the first heat pipe condensation section are turned off.

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