Radiant cooling and solar photovoltaic air deep dehumidification system and method

Abstract

A kind of air deep dehumidification system and method using radiation refrigeration and solar photovoltaic, deep dehumidification system includes solution dehumidification device, for completing pre-dehumidification by the contact with solution dehumidifier to indoor return air;Rotary dehumidification device, including regeneration side and dehumidification side, dehumidification side carries out deep dehumidification to indoor return air after pre-dehumidification by solid hygroscopic material;First surface cooler, for reducing the temperature of dehumidification side exhaust air to meet the indoor temperature demand;First electric heater, for heating outdoor fresh air to meet the temperature required for solid hygroscopic material regeneration, then enter the moisture in adsorbed solid hygroscopic material in regeneration side;Solution regeneration device, connected with solution dehumidification device, to concentrate the solution dehumidifier after completing pre-dehumidification and regenerate;Radiation refrigeration device, provides cold source for first surface cooler;Photovoltaic light-heat integrated device, uses solar power generation to provide electric energy for first electric heater.The present application can meet different deep dehumidification demand.

Description

Technical Field

[0001] This invention belongs to the field of heating, ventilation and air conditioning systems, and specifically relates to a deep air dehumidification system and method that uses radiative cooling and solar photovoltaic. Background Technology

[0002] In industrial buildings, many processing or production processes have strict requirements on ambient air humidity. Excessive humidity can severely impact production efficiency and product quality. Most industrial production processes require a low-humidity environment with an air moisture content below 7 g / kg. Maintaining this low-humidity environment in industrial settings necessitates high energy consumption from conventional deep dehumidification air conditioning systems, which constitute a major portion of the total energy consumption in industrial plants. Furthermore, compared to the indoor thermal and humidity control requirements of residential buildings, many industrial buildings have far more stringent requirements. Conventional dehumidification air conditioning systems based on solutions or solid desiccant agents cannot efficiently meet the deep dehumidification needs of different scenarios. Therefore, how to construct energy-efficient and high-performance deep dehumidification air conditioning systems that can achieve efficient indoor environmental control in various industrial scenarios while contributing to energy conservation and emission reduction in the industrial sector is a pressing issue that needs to be addressed. Summary of the Invention

[0003] The purpose of this invention is to address the problems in the prior art by providing a deep dehumidification system and method that employs radiative cooling and solar photovoltaic. By connecting a rotary dehumidifier and a solution dehumidifier in series, the system can meet the deep dehumidification needs of different industrial scenarios and achieve efficient control of indoor environmental parameters. At the same time, the system utilizes a photovoltaic-thermal integrated device and a radiative cooling device to provide electrical energy and cooling capacity to the system, respectively, thereby significantly reducing the energy consumption of the deep dehumidification air conditioning system.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] In a first aspect, a deep air dehumidification system employing radiative cooling and solar photovoltaic technology is provided, comprising:

[0006] Solution dehumidification device is used to pre-dehumidify indoor return air by contacting it with a solution dehumidifier;

[0007] The rotary dehumidifier includes a regeneration side and a dehumidification side. The dehumidification side uses solid moisture-absorbing materials to further dehumidify the indoor return air after the solution dehumidifier has pre-dehumidified it before supplying air.

[0008] The first surface cooler is used to reduce the temperature of the exhaust air from the dehumidification side to meet the indoor temperature requirements.

[0009] The first electric heater is used to heat the outdoor fresh air to meet the temperature required for the regeneration of the solid moisture-absorbing material. Then, it enters the regeneration side to adsorb the moisture in the solid moisture-absorbing material to achieve the regeneration of the solid moisture-absorbing material.

[0010] The solution regeneration device, connected to the solution dehumidification device, is used to concentrate and regenerate the solution desiccant after pre-dehumidification by using the air discharged from the regeneration side;

[0011] The radiant cooling device uses passive refrigeration to produce chilled water as the cold source for the first surface cooler;

[0012] The photovoltaic-thermal integrated device uses solar power to provide electricity for the first electric heater.

[0013] As a preferred embodiment, the solution regeneration device and the solution dehumidification device are connected via a solution dehumidifier circulation loop.

[0014] As a preferred embodiment, the solution regeneration device is connected to a second electric heater via a pipeline. The second electric heater heats the desiccant solution inside the solution regeneration device to increase the water vapor partial pressure on the surface of the desiccant solution.

[0015] The solution dehumidification device is connected to a second surface cooler via a pipeline. The second surface cooler cools the solution dehumidifier inside the solution dehumidification device to reduce the water vapor partial pressure on the surface of the solution dehumidifier.

[0016] As a preferred embodiment, the photovoltaic-thermal integrated device is connected to a first electric heater and a second electric heater respectively. A first solution circulation pump is also installed on the pipeline connecting the second electric heater and the solution regeneration device. The first solution circulation pump is used to sequentially transport the pre-dehumidified solution to the photovoltaic-thermal integrated device and the second electric heater for heating. The photovoltaic-thermal integrated device preheats the pre-dehumidified solution, and the second electric heater continues to heat the preheated solution to the temperature required for regeneration. Then, it is sent to the solution regeneration device to concentrate and regenerate the pre-dehumidified solution.

[0017] As a preferred embodiment, the radiant cooling device is connected to the first surface cooler and the second surface cooler respectively. A second solution circulation pump is also installed on the pipeline connecting the second surface cooler and the solution dehumidification device. The second solution circulation pump is used to sequentially deliver the concentrated and regenerated solution dehumidifier to the radiant cooling device and the second surface cooler for cooling. The radiant cooling device pre-cools the concentrated and regenerated solution dehumidifier. The second surface cooler continues to cool the pre-cooled solution dehumidifier to the temperature required for dehumidification, and then sends it to the solution dehumidification device to pre-dehumidify the incoming indoor return air.

[0018] As a preferred embodiment, the top of the solution regeneration device and the solution dehumidification device is provided with several nozzles for spraying the solution;

[0019] One end of the second electric heater is connected to the bottom of the solution regeneration device via a pipeline, and the other end is connected to several nozzles at the top of the solution regeneration device via a pipeline.

[0020] One end of the second surface cooler is connected to the bottom of the solution dehumidification device via a pipeline, and the other end is connected to several nozzles on the top of the solution dehumidification device via a pipeline.

[0021] As a preferred embodiment, the radiant cooling device is connected to a first surface cooler and a second surface cooler via pipelines for a first circulating water pump and a second circulating water pump, respectively. The first circulating water pump delivers chilled water to the first surface cooler, where it exchanges heat with the air and then flows back to the radiant cooling device. The second circulating water pump delivers chilled water to the second surface cooler, where it exchanges heat with the desiccant in the solution dehumidification device and then flows back to the radiant cooling device.

[0022] As a preferred embodiment, the photovoltaic-thermal integrated device and the solution dehumidification device are connected by a pipeline equipped with a third solution circulation pump. The third solution circulation pump delivers the dehumidifying agent after pre-dehumidification by the solution dehumidification device to the photovoltaic-thermal integrated device for heat exchange, utilizing the waste heat of the photovoltaic-thermal integrated device for preheating.

[0023] As a preferred embodiment, the radiative cooling device dissipates heat into outer space through an atmospheric window to achieve passive cooling and produce cold water.

[0024] Secondly, a deep air dehumidification method employing radiative cooling and solar photovoltaics is provided, comprising the following steps:

[0025] Indoor return air is introduced into the solution dehumidifier, where pre-dehumidification is completed through contact with the solution desiccant.

[0026] The pre-dehumidified indoor return air is delivered to the rotary dehumidifier. On the dehumidification side of the rotary dehumidifier, the pre-dehumidified indoor return air is further dehumidified by solid moisture-absorbing material before being delivered.

[0027] The deeply dehumidified supply air is cooled by the first surface cooler, and then supplied after the indoor temperature requirement is met.

[0028] Outdoor fresh air is heated by the first electric heater to meet the temperature required for the regeneration of the solid moisture-absorbing material in the rotary dehumidifier. Then, it is fed into the regeneration side of the rotary dehumidifier to adsorb the moisture in the solid moisture-absorbing material to achieve the regeneration of the solid moisture-absorbing material.

[0029] The air discharged from the regeneration side is fed into the solution regeneration device, which then introduces the solution dehumidifier after pre-dehumidification by the solution dehumidifier to concentrate and regenerate the solution dehumidifier. The concentrated and regenerated solution dehumidifier is then reintroduced into the solution dehumidifier to pre-dehumidify the indoor return air, completing the cycle.

[0030] Compared with the prior art, the present invention has at least the following beneficial effects:

[0031] Indoor return air first undergoes pre-dehumidification via a solution dehumidifier, then deep dehumidification via the dehumidification side of a rotary dehumidifier to meet indoor humidity requirements. Finally, the supply air is conditioned by the first surface cooler at the system's end before being delivered indoors. Outdoor fresh air is first heated to the required regeneration temperature by a first electric heater, then sequentially passes through the regeneration side of the rotary dehumidifier and the solution regeneration device to regenerate the solid moisture-absorbing material and the solution desiccant. This invention uses a radiant cooling device to produce chilled water using passive refrigeration technology as the cold source for the entire system; and a photovoltaic-thermal integrated device to generate electricity for the entire system using solar power. This invention connects the rotary dehumidifier and the solution dehumidifier in series to meet the deep dehumidification needs of different industrial scenarios and fully leverages the performance advantages of the two dehumidification methods in different dehumidification ranges. A first surface cooler at the system's end lowers the supply air temperature to meet indoor temperature requirements, enabling independent temperature and humidity control for efficient indoor environmental parameter control. Meanwhile, by utilizing photovoltaic-thermal integrated devices and radiant cooling devices to provide the system with electricity and cooling capacity respectively, the energy consumption of deep dehumidification air conditioning systems can be significantly reduced while achieving efficient indoor thermal and humidity control. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the structure of a deep air dehumidification system using radiative refrigeration and solar photovoltaic in this embodiment of the invention;

[0034] In the attached diagram: 1-First electric heater; 2-Rotating dehumidifier; 201-Regeneration side; 202-Dehumidification side; 3-Solution regeneration device; 4-Solution dehumidification device; 5-First surface cooler; 6-Second electric heater; 7-Second surface cooler; 8-First solution circulation pump; 9-Second solution circulation pump; 10-Radiative cooling device; 11-Photovoltaic-thermal integrated device; 12-First circulating water pump; 13-Second circulating water pump; 14-Third solution circulation pump. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0036] The components described and illustrated in the accompanying drawings and embodiments of this invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the accompanying drawings and embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0037] It should be noted that the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that a process, element, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to the process, element, method, article, or apparatus. Furthermore, the use of terms such as "first," "second," etc., to define components is solely for the purpose of distinguishing them; unless otherwise stated, these terms have no special meaning and should not be construed as indicating or implying relative importance.

[0038] Please see Figure 1 The present invention employs a deep air dehumidification system combining radiative cooling and solar photovoltaic, comprising:

[0039] Solution dehumidification device 4 is used to pre-dehumidify indoor return air by contacting it with a solution dehumidifier;

[0040] The rotary dehumidifier 2 includes a regeneration side 201 and a dehumidification side 202. The dehumidification side 202 uses solid moisture-absorbing material to further dehumidify the indoor return air after the solution dehumidifier 4 has been pre-dehumidified before supplying air.

[0041] The first surface cooler 5 is used to reduce the temperature of the supply air discharged from the dehumidification side 202 to meet the indoor temperature requirements.

[0042] The first electric heater 1 is used to heat the outdoor fresh air to meet the temperature required for the regeneration of the solid moisture-absorbing material, and then enters the regeneration side 201 to adsorb the moisture in the solid moisture-absorbing material to achieve the regeneration of the solid moisture-absorbing material.

[0043] The solution regeneration device 3 is connected to the solution dehumidification device 4 and is used to concentrate and regenerate the solution dehumidifier after pre-dehumidification by using the air discharged from the regeneration side 201.

[0044] The radiant cooling device 10 uses passive cooling to produce cold water as the cold source for the first surface cooler 5.

[0045] The photovoltaic-thermal integrated device 11 uses solar energy to provide power to the first electric heater 1.

[0046] In one possible implementation, the solution regeneration device 3 and the solution dehumidification device 4 are connected through a solution dehumidifier circulation loop, which can realize continuous dehumidification and regeneration of the deep air dehumidification system of the present invention.

[0047] The working process of the deep air dehumidification system using radiative refrigeration and solar photovoltaic in this embodiment of the invention is as follows:

[0048] The indoor return air first undergoes pre-dehumidification via the solution dehumidifier 4, then further dehumidifies via the dehumidification side 202 of the rotary dehumidifier 2 to meet indoor humidity requirements. Finally, the air is cooled by the first surface cooler 5 to meet temperature requirements before being introduced into the room. The outdoor fresh air is first heated by the first electric heater 1 to reach the regeneration temperature required by the rotary dehumidifier 2, then sequentially passes through the regeneration side 201 and the solution regeneration device 3, absorbing moisture from the solid moisture-absorbing material and the solution desiccant before being discharged outdoors.

[0049] This invention utilizes a radiant cooling device 10 to generate chilled water, which serves as the cold source for the entire system, and a photovoltaic-thermal integrated device 11 to provide power to the entire system, thereby significantly reducing the energy consumption of the deep dehumidification air conditioning system. This invention also connects a solution dehumidification device 4 and a rotary dehumidification device 2 in series for multi-stage dehumidification to meet the deep dehumidification needs of different industrial scenarios, and uses a first surface cooler 5 to handle the sensible heat load, achieving efficient control of indoor environmental parameters.

[0050] Furthermore, in order to improve the system energy efficiency, the dilute solution at the bottom of the solution dehumidification device 4 is first transported by the third solution circulation pump 14 to the back of the photovoltaic-thermal integrated device 11 for heat exchange. The waste heat generated by the photovoltaic-thermal integrated device 11 is used to preheat the solution, and at the same time, the temperature of the photovoltaic-thermal integrated device 11 can be reduced to improve its power generation efficiency.

[0051] In one possible implementation, the solution regeneration device 3 of this embodiment is connected to a second electric heater 6 via a pipeline. The second electric heater 6 heats the solution desiccant inside the solution regeneration device 3 to increase the water vapor partial pressure on the surface of the solution desiccant. The solution desiccant 4 is connected to a second surface cooler 7 via a pipeline. The second surface cooler 7 cools the solution desiccant inside the solution desiccant 4 to reduce the water vapor partial pressure on the surface of the solution desiccant.

[0052] Furthermore, in this embodiment of the invention, the photovoltaic-thermal integrated device 11 is connected to the first electric heater 1 and the second electric heater 6 respectively. The pipeline connecting the second electric heater 6 and the solution regeneration device 3 is also equipped with a first solution circulation pump 8. The first solution circulation pump 8 is used to sequentially transport the solution desiccant after pre-dehumidification to the photovoltaic-thermal integrated device 11 and the second electric heater 6 for heating. The photovoltaic-thermal integrated device 11 preheats the solution desiccant after pre-dehumidification, and the second electric heater 6 continues to heat the preheated solution desiccant to the temperature required for regeneration, and then sends it to the solution regeneration device 3 to concentrate and regenerate the solution desiccant after pre-dehumidification.

[0053] In this embodiment of the invention, the radiant cooling device 10 is connected to the first surface cooler 5 and the second surface cooler 7. The second surface cooler 7 is connected to the solution dehumidification device 4 via a pipeline equipped with a second solution circulation pump 9. The second solution circulation pump 9 is used to sequentially transport the concentrated and regenerated solution dehumidifier to the radiant cooling device 10 and the second surface cooler 7 for cooling. The radiant cooling device 10 pre-cools the concentrated and regenerated solution dehumidifier. The second surface cooler 7 further cools the pre-cooled solution dehumidifier to the temperature required for dehumidification, and then sends it to the solution dehumidification device 4 to pre-dehumidify the incoming indoor return air.

[0054] In one possible implementation, the solution regeneration device 3 and the solution dehumidification device 4 are equipped with several nozzles for spraying the solution at their tops. Of course, besides the top, these nozzles can also be positioned at other locations inside the solution dehumidification device 4 and the solution regeneration device 3, depending on specific needs, with the placement designed to ensure sufficient contact between the sprayed solution and the flowing air. One end of the second electric heater 6 is connected to the bottom of the solution regeneration device 3 via a pipe, and the other end is connected to the several nozzles at the top of the solution regeneration device 3 via a pipe. One end of the second surface cooler 7 is connected to the bottom of the solution dehumidification device 4 via a pipe, and the other end is connected to the several nozzles at the top of the solution dehumidification device 4 via a pipe.

[0055] In one possible implementation, the radiant cooling device 10 is connected to the first surface cooler 5 and the second surface cooler 7 via pipelines that provide a first circulating water pump 12 and a second circulating water pump 13, respectively. The first circulating water pump 12 delivers cold water to the first surface cooler 5, where it exchanges heat with the air and then flows back to the radiant cooling device 10. The second circulating water pump 13 delivers cold water to the second surface cooler 7, where it exchanges heat with the desiccant in the solution dehumidification device 4 and then flows back to the radiant cooling device 10.

[0056] In one possible implementation, the photovoltaic-thermal integrated device 11 and the solution dehumidification device 4 are connected by a pipeline with a third solution circulation pump 14. The third solution circulation pump 14 delivers the solution dehumidifier after pre-dehumidification by the solution dehumidification device 4 to the photovoltaic-thermal integrated device 11 for heat exchange, and uses the waste heat of the photovoltaic-thermal integrated device 11 for preheating.

[0057] In this embodiment of the invention, a radiative cooling device 10 is used to dissipate heat into outer space through an atmospheric window to achieve passive cooling and generate chilled water, which serves as the cold source for the first surface cooler 5 and the second surface cooler 7, thus achieving zero energy consumption and zero greenhouse gas emissions. This embodiment of the invention also incorporates a photovoltaic-thermal integrated device 11 to generate electricity from solar energy, providing power to the first electric heater 1 and the second electric heater 6 of the deep dehumidification air handling system, effectively reducing the regenerative energy consumption of the deep dehumidification air conditioning system. By delivering the desiccant solution to the back of the photovoltaic-thermal integrated device 11, the waste heat generated by the device is used to preheat the desiccant solution, thereby improving system energy efficiency.

[0058] Another embodiment of the present invention proposes a deep air dehumidification method using radiative cooling and solar photovoltaic, which mainly includes the following steps:

[0059] Indoor return air is introduced into solution dehumidification device 4, where pre-dehumidification is completed through contact with solution dehumidifier;

[0060] The pre-dehumidified indoor return air is delivered to the rotary dehumidifier 2. On the dehumidification side 202 of the rotary dehumidifier 2, the pre-dehumidified indoor return air from the solution dehumidifier 4 is further dehumidified by solid moisture-absorbing material before being delivered.

[0061] The deeply dehumidified supply air is cooled by the first surface cooler 5, and then supplied after meeting the indoor temperature requirements.

[0062] Outdoor fresh air is heated by the first electric heater 1 to meet the temperature required for the regeneration of the solid moisture-absorbing material of the rotary dehumidifier 2. Then, it is fed into the regeneration side 201 of the rotary dehumidifier 2 to adsorb the moisture in the solid moisture-absorbing material to achieve the regeneration of the solid moisture-absorbing material.

[0063] The air discharged from the regeneration side 201 is fed into the solution regeneration device 3. The solution dehumidifier after pre-dehumidification by the solution dehumidifier 4 is introduced into the solution regeneration device 3 to concentrate and regenerate the solution dehumidifier. The concentrated and regenerated solution dehumidifier is then reintroduced into the solution dehumidifier 4 to pre-dehumidify the indoor return air, thus completing the cycle.

[0064] In one possible implementation, this invention employs a deep air dehumidification method combining radiative cooling and solar photovoltaics. A radiative cooling device 10 discharges heat into outer space through an atmospheric window to achieve passive cooling, providing chilled water for the first surface cooler 5 and the second surface cooler 7. A photovoltaic-thermal integrated device 11 uses solar power to provide electricity for the first electric heater 1 and the second electric heater 6. The photovoltaic-thermal integrated device 11 preheats the desiccant solution after pre-dehumidification, and the second electric heater 6 further heats the preheated desiccant solution to the required regeneration temperature before sending it to the solution regeneration device 3 for concentration and regeneration. Meanwhile, the radiative cooling device 10 precools the concentrated and regenerated desiccant solution, and the second surface cooler 7 further cools the precooled desiccant solution to the required dehumidification temperature before sending it to the solution dehumidification device 4 to pre-dehumidify the incoming indoor return air.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0066] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application, and should all be included within the protection scope of this application.

Claims

1. A deep air dehumidification system employing radiative cooling and solar photovoltaic power, characterized in that, include: The solution dehumidification device (4) is used to pre-dehumidify indoor return air by contacting it with a solution dehumidifier; The rotary dehumidifier (2) includes a regeneration side (201) and a dehumidification side (202). The dehumidification side (202) uses solid moisture-absorbing material to further dehumidify the indoor return air after the solution dehumidifier (4) has been pre-dehumidified before supplying air. The first surface cooler (5) is used to reduce the temperature of the supply air discharged from the dehumidification side (202) to meet the indoor temperature requirements. The first electric heater (1) is used to heat the outdoor fresh air to meet the temperature required for the regeneration of the solid moisture-absorbing material, and then enters the regeneration side (201) to adsorb the moisture in the solid moisture-absorbing material to achieve the regeneration of the solid moisture-absorbing material. The solution regeneration device (3) is connected to the solution dehumidification device (4) and is used to concentrate and regenerate the solution dehumidifier after pre-dehumidification by using the air discharged from the regeneration side (201); The radiant cooling device (10) uses passive cooling to produce cold water as the cold source for the first surface cooler (5); The photovoltaic-thermal integrated device (11) uses solar energy to provide power for the first electric heater (1); The solution regeneration device (3) is connected to a second electric heater (6) via a pipeline. The second electric heater (6) heats the solution desiccant inside the solution regeneration device (3) to increase the water vapor partial pressure on the surface of the solution desiccant. The photovoltaic-thermal integrated device (11) is connected to the first electric heater (1) and the second electric heater (6) respectively. The pipeline connecting the second electric heater (6) and the solution regeneration device (3) is also equipped with a first solution circulation pump (8). The first solution circulation pump (8) is used to sequentially transport the solution dehumidifier after pre-dehumidification to the photovoltaic-thermal integrated device (11) and the second electric heater (6) for heating. The photovoltaic-thermal integrated device (11) preheats the solution dehumidifier after pre-dehumidification. The second electric heater (6) continues to heat the preheated solution dehumidifier to the temperature required for regeneration, and then sends it to the solution regeneration device (3) to concentrate and regenerate the solution dehumidifier after pre-dehumidification.

2. The deep air dehumidification system employing radiative cooling and solar photovoltaic as described in claim 1, characterized in that, The solution regeneration device (3) and the solution dehumidification device (4) are connected by a solution dehumidifier circulation loop.

3. The deep air dehumidification system employing radiative cooling and solar photovoltaic as described in claim 1, characterized in that, The solution dehumidification device (4) is connected to a second surface cooler (7) via a pipeline. The second surface cooler (7) cools the solution dehumidifier inside the solution dehumidification device (4) to reduce the water vapor partial pressure on the surface of the solution dehumidifier.

4. The deep air dehumidification system employing radiative cooling and solar photovoltaic as described in claim 3, characterized in that, The radiant cooling device (10) is connected to the first surface cooler (5) and the second surface cooler (7) respectively. The second surface cooler (7) is connected to the solution dehumidification device (4) by a second solution circulation pump (9). The second solution circulation pump (9) is used to transport the concentrated and regenerated solution dehumidifier to the radiant cooling device (10) and the second surface cooler (7) for cooling. The radiant cooling device (10) pre-cools the concentrated and regenerated solution dehumidifier. The second surface cooler (7) continues to cool the pre-cooled solution dehumidifier to the temperature required for dehumidification. Then it is sent to the solution dehumidification device (4) to pre-dehumidify the incoming indoor return air.

5. The deep air dehumidification system employing radiative cooling and solar photovoltaic as described in claim 3, characterized in that, The solution regeneration device (3) and the solution dehumidification device (4) are equipped with several nozzles for spraying solution on their tops; One end of the second electric heater (6) is connected to the bottom of the solution regeneration device (3) through a pipeline, and the other end is connected to several nozzles on the top of the solution regeneration device (3) through a pipeline; One end of the second surface cooler (7) is connected to the bottom of the solution dehumidification device (4) via a pipeline, and the other end is connected to several nozzles on the top of the solution dehumidification device (4) via a pipeline.

6. The deep air dehumidification system employing radiative refrigeration and solar photovoltaic as described in claim 3, characterized in that, The radiant cooling device (10) is connected to the first surface cooler (5) and the second surface cooler (7) through pipelines of the first circulating water pump (12) and the second circulating water pump (13), respectively. The first circulating water pump (12) delivers cold water to the first surface cooler (5), which exchanges heat with the air and then flows back to the radiant cooling device (10). The second circulating water pump (13) delivers cold water to the second surface cooler (7), which exchanges heat with the desiccant in the solution dehumidification device (4) and then flows back to the radiant cooling device (10).

7. The deep air dehumidification system employing radiative refrigeration and solar photovoltaic as described in claim 1, characterized in that, The photovoltaic-thermal integrated device (11) and the solution dehumidification device (4) are connected by a pipeline with a third solution circulation pump (14). The third solution circulation pump (14) transports the solution dehumidifier after pre-dehumidification by the solution dehumidification device (4) to the photovoltaic-thermal integrated device (11) for heat exchange, and uses the waste heat of the photovoltaic-thermal integrated device (11) for preheating.

8. The deep air dehumidification system employing radiative cooling and solar photovoltaic according to claim 1, characterized in that, The radiative cooling device (10) dissipates heat into outer space through an atmospheric window to achieve passive cooling and produce cold water.

9. A method for deep air dehumidification using radiative cooling and solar photovoltaic, characterized in that, The deep air dehumidification system based on any one of claims 1 to 8, employing radiative cooling and solar photovoltaics, includes the following steps: Indoor return air is introduced into the solution dehumidifier (4) to complete pre-dehumidification by contacting the solution dehumidifier; The pre-dehumidified indoor return air is delivered to the rotary dehumidifier (2). On the dehumidification side (202) of the rotary dehumidifier (2), the indoor return air after pre-dehumidification by the solution dehumidifier (4) is further dehumidified by solid moisture-absorbing material before being delivered. The deep dehumidified supply air is cooled by the first surface cooler (5) and then supplied after the indoor temperature requirement is met. Outdoor fresh air is heated by the first electric heater (1) to meet the temperature required for the regeneration of the solid moisture-absorbing material of the rotary dehumidifier (2), and then input into the regeneration side (201) of the rotary dehumidifier (2) to adsorb the moisture in the solid moisture-absorbing material to achieve the regeneration of the solid moisture-absorbing material. The air discharged from the regeneration side (201) is fed into the solution regeneration device (3), and the solution regeneration device (3) is fed into the solution dehumidifier (4) to complete the pre-dehumidification of the solution dehumidifier, and the solution dehumidifier is concentrated and regenerated; and the concentrated and regenerated solution dehumidifier is fed back into the solution dehumidifier (4) to pre-dehumidify the indoor return air and complete the cycle.

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