Solar driven deep dehumidification system and method

Abstract

Solar driven deep dehumidification systems and methods utilizing spectral splitting of sunlight are provided. The system comprises a plurality of air dehumidification modules; and the solar energy conversion module is configured to convert solar energy into heat energy and electric energy so as to drive the plurality of air dehumidification modules. The plurality of air dehumidification modules includes: a liquid desiccant dehumidification module configured to dehumidify an air flow using a liquid desiccant to supply a dehumidified air flow; and a vacuum membrane dehumidification module configured to further dehumidify the dehumidified airflow from the liquid desiccant dehumidification module to supply a deeply dehumidified airflow. The proposed system paves a road for clean and sustainable deep dehumidification.

Description

Cross-references to related applications

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 717,845, filed November 7, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] This invention generally relates to the fields of sustainable energy and dehumidification technology, and in particular to clean and deep dehumidification systems and methods that utilize the spectral splitting of sunlight. Background Technology

[0003] Maintaining ultra-low humidity environments is typically required in production workshops. However, establishing and maintaining such environments usually consumes a significant amount of energy. To meet this need, existing systems often employ a hybrid energy structure, including electricity and renewable energy sources, to generate air with ultra-low humidity. This reliance on hybrid energy stems in part from the inefficiencies of renewable energy sources such as solar energy. For example, patent JP6116096B2 discloses a solar-powered dehumidification device comprising a solar energy conversion system and a solid-state dehumidification system. Sunlight irradiating a photovoltaic panel is converted into electrical and thermal energy, with the generated thermal energy used to drive the solid-state dehumidification system. However, this solution does not further utilize electrical energy for deep dehumidification. Another patent, CN103041675A, discloses a solar-driven dehumidification system primarily comprising a photovoltaic panel and a membrane regenerator. Solar energy is converted into electrical energy via the photovoltaic panel and used to drive the membrane regenerator. In this process, cations move towards the negative electrode, anions move towards the positive electrode, the solution is concentrated in the regeneration chamber, and diluted in the dilution chamber. However, these methods only utilize the electrical energy converted from solar energy, without fully utilizing its thermal energy portion, resulting in limited energy efficiency. Summary of the Invention

[0004] One objective of this invention is to provide a solar-powered deep dehumidification system and method with improved solar energy conversion and utilization efficiency.

[0005] According to a first aspect of the present invention, a solar-driven deep dehumidification system includes: a plurality of air dehumidification modules; and a solar energy conversion module configured to convert solar energy into thermal energy and electrical energy to drive the plurality of air dehumidification modules; wherein the plurality of air dehumidification modules include: at least one liquid desiccant dehumidification module configured to dehumidify an airflow using a liquid desiccant to supply a dehumidified airflow; and at least one vacuum membrane dehumidification module configured to further dehumidify the dehumidified airflow from the liquid desiccant dehumidification module to supply a deep dehumidified airflow.

[0006] Preferably, the solar energy conversion module includes a concentrator, a spectral filter, a photovoltaic (PV) panel, a battery, and a solar collector.

[0007] Preferably, the concentrator is a parabolic trough, a parabolic dish, a linear Fresnel reflector, or a central tower receiver.

[0008] Preferably, the solar collector is a flat plate collector or a vacuum tube collector.

[0009] Preferably, the concentrator is configured to collect sunlight and concentrate the collected sunlight onto a spectral filter; and the spectral filter is configured to: divide the collected sunlight into short-wavelength bands and long-wavelength bands; and project the short-wavelength band sunlight onto the PV panel and the long-wavelength band sunlight onto the solar collector.

[0010] Preferably, the PV panel is configured to convert short-wavelength sunlight into electrical energy to charge the battery; and the battery is configured to store electrical energy and supply electrical energy to the vacuum membrane dehumidification module and / or the liquid desiccant dehumidification module.

[0011] Preferably, the solar collector is configured to convert long-wavelength sunlight into thermal energy for heating a heat transfer medium, which is used to transfer the thermal energy to a liquid desiccant dehumidification module.

[0012] Preferably, the heat transfer medium is air, heat transfer oil, or water.

[0013] Preferably, the liquid desiccant dehumidification module includes a dehumidifier configured to: receive a humid air stream and a cooled concentrated liquid desiccant stream; facilitate the cooling concentrated liquid desiccant stream to dehumidify the humid air stream to obtain a dehumidified air stream; and discharge the diluted liquid desiccant stream.

[0014] Preferably, the liquid desiccant dehumidification module further includes a regenerator configured to: receive a heated diluted liquid desiccant stream and a dry air stream; promote the interaction between the heated diluted liquid desiccant stream and the dry air stream to release the absorbed moisture therein to regenerate the concentrated liquid desiccant stream; and discharge a humidified air stream.

[0015] Preferably, the liquid desiccant dehumidification module further includes: a first heat exchanger comprising: a first channel pneumatically and / or hydraulically connected to the regenerator, and a second channel pneumatically and / or hydraulically connected to the solar energy conversion module; and the first heat exchanger is configured to supply the heated diluted liquid desiccant stream to the regenerator by exchanging heat from the heat transfer medium to the preheated diluted liquid desiccant stream.

[0016] Preferably, a second heat exchanger includes a first channel pneumatically and / or hydraulically connected to the dehumidifier, and a second channel allowing a cooling medium to pass through; and the second heat exchanger is configured to supply a cooled concentrated liquid desiccant stream to the dehumidifier by exchanging heat from the pre-cooled concentrated liquid desiccant stream to the cooling medium; and a third heat exchanger includes a first channel pneumatically and / or hydraulically connected to the first heat exchanger and the dehumidifier, and a second channel pneumatically and / or hydraulically connected to the regenerator and the second heat exchanger, and the third heat exchanger is configured to: exchange heat from the concentrated liquid desiccant stream to a diluted liquid desiccant stream to obtain a preheated diluted liquid desiccant stream and a pre-cooled concentrated liquid desiccant stream; and supply the preheated diluted liquid desiccant stream and the pre-cooled concentrated liquid desiccant stream to the first heat exchanger and the second heat exchanger, respectively.

[0017] Preferably, the liquid desiccant dehumidification module further includes: a first solution pump configured to pump a concentrated liquid desiccant stream from the regenerator to the second heat exchanger; and a second solution pump configured to pump a diluted liquid desiccant stream from the dehumidifier to the second heat exchanger.

[0018] Preferably, the liquid desiccant dehumidification module further includes: a first fan configured to force a dry airflow into a regenerator; a second fan configured to force a cooling airflow through a second heat exchanger; and a third fan configured to force a humid airflow into the dehumidifier.

[0019] Preferably, the vacuum membrane dehumidification module includes: a feed chamber; one or more permeable cavities disposed within the feed chamber; and a vacuum pumping module pneumatically connected to the permeable cavities.

[0020] Preferably, the feed chamber is configured to receive an inlet airflow dehumidified by a liquid desiccant dehumidification module; the vacuum pumping module is configured to create a vacuum environment in a permeable cavity, such that water vapor in the inlet airflow permeates into the permeable cavity due to the water vapor pressure difference, and the inlet airflow is further dehumidified to obtain a deeply dehumidified outlet airflow; and the feed chamber is then configured to deliver the deeply dehumidified outlet airflow to the user.

[0021] Preferably, the vacuum pumping module includes one or more vacuum pumps that are pneumatically connected in series.

[0022] Preferably, each permeable cavity is made of a hollow fiber membrane.

[0023] Preferably, one or more permeable cavities are aerodynamically connected in series.

[0024] Preferably, the liquid drying agent is a LiBr solution, a LiCl solution, or an HCOOK solution.

[0025] According to a second aspect of the present invention, a solar-driven deep dehumidification method includes: converting solar energy into thermal energy and electrical energy through a solar energy conversion module, the solar energy conversion module including a concentrator, a spectral filter, a photovoltaic panel, a rechargeable battery, and a solar collector; supplying thermal energy to a liquid desiccant dehumidification module, the liquid desiccant dehumidification module including a dehumidifier, a regenerator, and a heat exchanger; dehumidifying a humid airflow by cooling a concentrated liquid desiccant stream in the dehumidifier to generate a dehumidified airflow and a diluted liquid desiccant stream; regenerating a concentrated liquid desiccant stream from the diluted liquid desiccant stream using a dry airflow in the regenerator; supplying electrical energy to a vacuum membrane dehumidification module, the vacuum membrane dehumidification module including a feed chamber, one or more permeable cavities, and a vacuum pumping module; and further dehumidifying the dehumidified airflow by feeding the dehumidified airflow into the feed chamber, and creating a vacuum environment in the permeable cavity such that water vapor in the dehumidified airflow permeates into the permeable cavity due to the water vapor pressure difference, thereby obtaining a deeply dehumidified airflow for delivery to a user.

[0026] By integrating renewable solar energy into the dehumidification process, the system provides a highly efficient and energy-saving solution for dehumidification, reducing reliance on conventional energy sources, lowering operating costs, promoting the use of sustainable energy, and reducing the carbon footprint associated with traditional dehumidification methods. This invention enables extremely low humidity levels (below 1 g / kg) and is suitable for air dehumidification in various scenarios (e.g., residential, commercial, and industrial environments) as well as maintaining comfortable and healthy humidity levels in climate control applications. Attached Figure Description

[0027] Embodiments of the invention are described in more detail below with reference to the accompanying drawings, in which:

[0028] Figure 1 A schematic diagram of a solar-driven deep dehumidification system according to an embodiment of the present invention is shown;

[0029] Figure 2 A flowchart of a solar-driven deep dehumidification method according to an embodiment of the present invention is shown. Detailed Implementation

[0030] In the following description, details of the invention are set forth as preferred embodiments. It will be apparent to those skilled in the art that modifications, including additions and / or substitutions, can be made without departing from the scope and spirit of the invention. Specific details may be omitted to avoid obscuring the invention; however, this disclosure is prepared to enable those skilled in the art to practice the teachings herein without requiring extensive experimentation.

[0031] Figure 1A schematic diagram of a solar-driven deep dehumidification system 1 according to an embodiment of the present invention is shown. The solar-driven deep dehumidification system 1 includes a solar energy conversion module 10, a liquid desiccant dehumidification module 20, and a vacuum membrane dehumidification module 30. The solar energy conversion module 10 is configured to convert solar energy into thermal and electrical energy to drive the liquid desiccant dehumidification module 20 and the vacuum membrane dehumidification module 30. The liquid desiccant dehumidification module 20 is configured to dehumidify a humid air (HA) stream using a liquid desiccant to supply a dehumidified air (DHA) stream. The vacuum membrane dehumidification module 30 is configured to further dehumidify the dehumidified air stream from the liquid desiccant dehumidification module to supply a deep dehumidified air stream.

[0032] The solar conversion module 10 includes a concentrator 101, a spectral filter (or beam splitter) 102, a photovoltaic (PV) panel 103, a rechargeable battery 104, and a solar collector 105.

[0033] Concentrator 101 is configured to collect sunlight and concentrate the collected sunlight onto spectral filter 102. Concentrators with different structural designs may be used depending on the actual implementation of the system. For example, but not limited to, concentrator 101 may be a parabolic trough concentrator, a parabolic dish concentrator, a linear Fresnel reflector, and a central tower receiver.

[0034] The spectral filter 102 is configured to split the collected sunlight into short-wavelength bands and long-wavelength bands; and to project the short-wavelength sunlight onto the PV panel 103 and the long-wavelength sunlight onto the solar collector 105.

[0035] The PV panel 103 is configured to convert short-wavelength sunlight into electrical energy to charge the rechargeable battery 104. The PV panel can be constructed from PV cells made of, for example, but not limited to, silicon (Si), gallium arsenide (GaAs), cadmium telluride (CdTe), copper indium gallium selenide (CIGS), germanium (Ge), and any suitable III-V compound semiconductor.

[0036] The rechargeable battery 104 is configured to store electrical energy and power the operation of the vacuum membrane dehumidification module. The rechargeable battery 104 may be made of, for example, but not limited to, nickel metal hydride (NiMH) batteries or lithium-ion (Li-ion) batteries.

[0037] Solar collector 105 is configured to convert long-wavelength sunlight into heat energy to heat heat transfer medium HTM1, which can then be used to transfer the heat energy to a liquid desiccant dehumidification module. Solar collector 105 may be, for example, but not limited to, a flat-plate collector or a vacuum tube collector. The heat transfer medium may be, for example, but not limited to, air, water, or heat transfer oil.

[0038] The liquid desiccant dehumidification module 20 includes a dehumidifier 201, a regenerator 202, heat exchangers 203, 204, and 205, solution pumps 206 and 207, and fans 208, 209, and 210.

[0039] The dehumidifier 201 is configured to: receive a humid airflow and a cooling concentrated (or strong) liquid desiccant flow F1; promote the dehumidification of the humid airflow by the cooling concentrated liquid desiccant flow F1 to obtain a dehumidified airflow; and discharge a diluted (or weak) liquid desiccant flow F2. The humid airflow and the cooling concentrated liquid desiccant flow F1 can be arranged in the dehumidifier 201 as parallel flow, counterflow, or crossflow.

[0040] For example, but not limited to, the liquid desiccant may be a lithium bromide (LiBr) solution, a LiCl (lithium chloride) solution, or a potassium formate (HCOOK) solution.

[0041] Regenerator 202 is configured to: receive a heated and diluted liquid desiccant stream F3 and a dry air (DA) stream; promote the interaction between the heated and diluted liquid desiccant stream F3 and the dry air stream to release the absorbed moisture therein to regenerate the concentrated liquid desiccant stream F4; and discharge a humidified air (HDA) stream. The dry air stream and the heated and diluted liquid desiccant stream F3 can be arranged in a parallel, counter-current, or cross-flow configuration in regenerator 202.

[0042] The heat exchanger 203 includes a first channel pneumatically and / or hydraulically connected to the regenerator 202 and a second channel pneumatically and / or hydraulically connected to the collector 105. The heat exchanger 203 is configured to supply the heated diluted liquid desiccant stream F3 to the regenerator 202 by exchanging heat from the heat transfer medium HTM1 from the collector 105 to the preheated diluted liquid desiccant stream F5.

[0043] The heat exchanger 204 includes a first channel pneumatically and / or hydraulically connected to the dehumidifier 201 and a second channel allowing the cooling medium (or heat transfer medium) HTM2 to pass through.

[0044] Heat exchanger 204 is configured to supply cooled concentrated liquid desiccant stream F1 to dehumidifier 201 by exchanging heat from the pre-cooled concentrated liquid desiccant stream F6 to a cooling medium. The cooling medium may be, for example, but not limited to, ambient air, water, or heat transfer oil.

[0045] The heat exchanger 205 includes a first channel pneumatically and / or hydraulically connected to the dehumidifier 201 and the heat exchanger 203; and a second channel pneumatically and / or hydraulically connected to the regenerator 202 and the second heat exchanger 204.

[0046] Heat exchanger 205 is configured to exchange heat between concentrated liquid desiccant stream F4 and diluted liquid desiccant stream F2 to obtain preheated diluted liquid desiccant stream F5 and precooled concentrated liquid desiccant stream F6; and preheated diluted liquid desiccant stream F5 and precooled concentrated liquid desiccant stream F6 are supplied to heat exchangers 203 and 204, respectively.

[0047] The liquid desiccant dehumidification module 20 further includes: a solution pump 206 configured to pump a concentrated liquid desiccant stream F4 from the regenerator 202 to the heat exchanger 205; and a solution pump 207 configured to pump a diluted liquid desiccant stream F2 from the dehumidifier 201 to the heat exchanger 205. In some embodiments, the liquid desiccant dehumidification module 20 further includes a solution pump 211 configured to pump a heat transfer medium HTM1 from the collector 105 to the heat exchanger 203.

[0048] The liquid desiccant dehumidification module 20 further includes: a fan 208 configured to force a dry airflow through a regenerator 202; a fan 209 configured to force an airflow (cooling medium) through a heat exchanger 204; and a fan 210 configured to force a humid airflow into the dehumidifier 201.

[0049] The vacuum membrane dehumidification module 30 includes a feed chamber 301 and one or more permeable cavities 302 disposed within the feed chamber 301. Each of the permeable cavities 302 may be made of a hollow fiber membrane. The one or more permeable cavities 302 may be pneumatically connected in series.

[0050] The vacuum membrane dehumidification module 30 further includes a vacuum pumping module 303 pneumatically connected to the permeable cavity 322. In some embodiments, the vacuum pumping module may include one or more vacuum pumps pneumatically connected in series.

[0051] Feed chamber 301 is configured to receive an intake airflow dehumidified by liquid desiccant dehumidification module 20. Vacuum pumping module is configured to create a vacuum environment in permeable cavity 302, causing water vapor in the intake airflow to permeate into permeable cavity 302 due to the water vapor pressure difference, and the intake airflow undergoes further dehumidification to obtain a deeply dehumidified outlet airflow. Feed chamber 301 is then further configured to deliver the deeply dehumidified outlet airflow to the user.

[0052] Figure 2 A flowchart illustrating a solar-driven deep dehumidification method according to an embodiment of the present invention is shown. Preferably, using... Figure 1 The system execution method S100 is shown in the figure. Method S100 includes the following steps:

[0053] S101: Converts solar energy into heat and electricity by splitting the spectrum of sunlight;

[0054] S102: Supply heat energy to the liquid desiccant dehumidification module, which includes a dehumidifier, a regenerator, and a heat exchanger;

[0055] S103: In a dehumidifier, a stream of cooled concentrated liquid desiccant is used to dehumidify a stream of humid air to produce a stream of dehumidified air and a stream of diluted liquid desiccant.

[0056] S104: A dry air stream is used in the regenerator to regenerate a diluted liquid desiccant stream into a concentrated liquid desiccant stream;

[0057] S105: Supplying electrical energy to the vacuum membrane dehumidification module, the vacuum membrane dehumidification module including a feed chamber, one or more permeable cavities, and a vacuum pumping module; and

[0058] S106: The dehumidified airflow is further dehumidified by feeding the dehumidified airflow into the feed chamber, and a vacuum environment is created in the permeable cavity, so that the water vapor in the dehumidified airflow permeates into the permeable cavity due to the water vapor pressure difference, thereby obtaining a deeply dehumidified airflow for delivery to the user.

[0059] In some embodiments, the method further includes circulating concentrated liquid desiccant streams and diluted liquid desiccant streams between the dehumidifier and the regenerator via a heat exchanger and a solution pump.

[0060] The functional units and modules according to the embodiments disclosed herein may be implemented using computing devices, computer processors, or electronic circuit systems, including but not limited to application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), microcontrollers, and other programmable logic devices configured or programmed according to the teachings of this disclosure. Based on the teachings of this disclosure, those skilled in the art of software or electronics can readily prepare computer instructions or software code to run in computing devices, computer processors, or programmable logic devices.

[0061] All or part of the methods according to the embodiments can be executed in one or more computing devices including server computers, personal computers, laptop computers, mobile computing devices (e.g., smartphones) and tablet computers.

[0062] Embodiments may include computer storage media, temporary and non-temporary memory devices having computer instructions or software code stored therein, which can be used to program or configure a computing device, computer processor, or electronic circuit system to perform any of the processes of the present invention. Storage media, temporary and non-temporary memory devices may include, but are not limited to, floppy disks, optical disks, Blu-ray discs, DVDs, CD-ROMs and magneto-optical disks, ROMs, RAMs, flash memory devices, or any type of medium or device suitable for storing instructions, code, and / or data.

[0063] Each of the functional units and modules according to various embodiments may also be implemented in a distributed computing environment and / or cloud computing environment, wherein one or more processing devices interconnected by a communication network such as an intranet, wide area network (WAN), local area network (LAN), Internet and other forms of data transmission media execute all or part of the machine instructions in a distributed manner.

[0064] While this disclosure has been described and illustrated with reference to specific embodiments thereof, such descriptions and illustrations are not limiting. Illustrations may not necessarily be drawn to scale. Due to manufacturing processes and tolerances, artistic representations in this disclosure may differ from actual equipment. Other embodiments of this disclosure may exist that are not explicitly shown. Modifications may be made to suit particular circumstances, materials, composition, methods, or processes to the objectives and scope of this disclosure. All such modifications are intended to fall within the scope of the appended claims. Although the methods disclosed herein have been described with reference to specific operations performed in a particular order, it should be understood that these operations may be combined, subdivided, or reordered to form equivalent methods without departing from the teachings of this disclosure. Therefore, the order and grouping of operations are not limiting unless expressly indicated herein.

Claims

1. A solar-driven deep dehumidification system, comprising: Multiple air dehumidification modules; and A solar energy conversion module configured to convert solar energy into thermal and electrical energy to drive the plurality of air dehumidification modules; The plurality of air dehumidification modules include: At least one liquid desiccant dehumidification module is configured to dehumidify an airflow using a liquid desiccant to supply the dehumidified airflow; and At least one vacuum membrane dehumidification module is configured to further dehumidify the dehumidified airflow from the liquid desiccant dehumidification module to supply a deeply dehumidified airflow.

2. The solar-driven deep dehumidification system according to claim 1, wherein the solar conversion module includes a concentrator, a spectral filter, a photovoltaic (PV) panel, a battery, and a solar collector.

3. The solar-driven deep dehumidification system according to claim 2, wherein the concentrator is a parabolic trough, a parabolic dish, a linear Fresnel reflector, or a central tower receiver.

4. The solar-driven deep dehumidification system according to claim 2, wherein the solar collector is a flat plate collector or a vacuum tube collector.

5. The solar-driven deep dehumidification system according to claim 2, wherein... The concentrator is configured to collect sunlight and concentrate the collected sunlight onto the spectral filter; and The spectral filter is configured to: divide the collected sunlight into short-wavelength bands and long-wavelength bands; and project the short-wavelength sunlight onto the PV panel and the long-wavelength sunlight onto the solar collector.

6. The solar-driven deep dehumidification system according to claim 2, wherein... The PV panel is configured to convert sunlight in the short wavelength band into electrical energy to charge the battery; and The battery is configured to store the electrical energy and supply the electrical energy to the vacuum membrane dehumidification module and / or the liquid desiccant dehumidification module.

7. The solar-driven deep dehumidification system according to claim 2, wherein the solar collector is configured to convert sunlight in the long wavelength band into heat energy to heat a heat transfer medium, the heat transfer medium being used to transfer the heat energy to the liquid desiccant dehumidification module.

8. The solar-driven deep dehumidification system according to claim 7, wherein the heat transfer medium is air, heat transfer oil or water.

9. The solar-driven deep dehumidification system according to claim 1, wherein the liquid desiccant dehumidification module includes a dehumidifier configured to: receive a humid air stream and a cooled concentrated liquid desiccant stream; promote the cooled concentrated liquid desiccant stream to dehumidify the humid air stream to obtain a dehumidified air stream; and discharge a diluted liquid desiccant stream.

10. The solar-driven deep dehumidification system of claim 9, wherein the liquid desiccant dehumidification module further comprises a regenerator configured to: receive a heated and diluted liquid desiccant stream and a dry air stream; facilitate the interaction between the heated and diluted liquid desiccant stream and the dry air stream to release moisture absorbed therein to regenerate the concentrated liquid desiccant stream; and discharge a humidified air stream.

11. The solar-driven deep dehumidification system according to claim 10, wherein the liquid desiccant dehumidification module further comprises: A first heat exchanger includes: a first channel pneumatically and / or hydraulically connected to the regenerator, and a second channel pneumatically and / or hydraulically connected to the solar conversion module; and the first heat exchanger is configured to supply the heated diluted liquid desiccant stream to the regenerator by exchanging heat from the heat transfer medium to the preheated diluted liquid desiccant stream. A second heat exchanger includes a first channel pneumatically and / or hydraulically coupled to the dehumidifier, and a second channel allowing a cooling medium to pass through; and the second heat exchanger is configured to supply the cooled concentrated liquid desiccant stream to the dehumidifier by exchanging heat from the pre-cooled concentrated liquid desiccant stream to the cooling medium; and A third heat exchanger includes: a first channel pneumatically and / or hydraulically connected to the first heat exchanger and the dehumidifier, and a second channel pneumatically and / or hydraulically connected to the regenerator and the second heat exchanger; and the third heat exchanger is configured to: exchange heat from the concentrated liquid desiccant stream to the diluted liquid desiccant stream to obtain the preheated diluted liquid desiccant stream and the precooled concentrated liquid desiccant stream; and supply the preheated diluted liquid desiccant stream and the precooled concentrated liquid desiccant stream to the first heat exchanger and the second heat exchanger, respectively.

12. The solar-driven deep dehumidification system according to claim 11, wherein the liquid desiccant dehumidification module further comprises: A first solution pump is configured to pump the concentrated liquid desiccant stream from the regenerator to the second heat exchanger; and A second solution pump is configured to pump the diluted liquid desiccant stream from the dehumidifier to the second heat exchanger.

13. The solar-driven deep dehumidification system according to claim 12, wherein the liquid desiccant dehumidification module further comprises: A first fan is configured to force the dry airflow into the regenerator; A second fan is configured to force cooling airflow through the second heat exchanger; and A third fan is configured to force the humid airflow into the dehumidifier.

14. The solar-driven deep dehumidification system according to claim 1, wherein the vacuum membrane dehumidification module comprises: Feed chamber; One or more permeable cavities are disposed within the feed chamber; and A vacuum pumping module is pneumatically connected to the permeable cavity.

15. The solar-driven deep dehumidification system according to claim 14, wherein... The feed chamber is configured to receive the incoming airflow dehumidified by the liquid desiccant dehumidification module; The vacuum pumping module is configured to create a vacuum environment in the permeable cavity, allowing water vapor in the intake airflow to permeate into the permeable cavity due to the water vapor pressure difference, and the intake airflow is further dehumidified to obtain a deeply dehumidified outlet airflow; and The feed chamber is then configured to deliver the deeply dehumidified exhaust airflow to the user.

16. The solar-driven deep dehumidification system of claim 14, wherein the vacuum pumping module comprises one or more pneumatically connected vacuum pumps in series.

17. The solar-driven deep dehumidification system of claim 14, wherein each permeable cavity is made of a hollow fiber membrane.

18. The solar-driven deep dehumidification system of claim 14, wherein the one or more permeable cavities are aerodynamically connected in series.

19. The solar-driven deep dehumidification system according to claim 1, wherein the liquid desiccant is a LiBr solution, a LiCl solution, or an HCOOK solution.

20. A solar-driven deep dehumidification method, comprising: Solar energy is converted into thermal and electrical energy through a solar energy conversion module, which includes a concentrator, a spectral filter, a photovoltaic panel, a rechargeable battery, and a solar collector. The heat energy is supplied to the liquid desiccant dehumidification module, which includes a dehumidifier, a regenerator, and a heat exchanger. In the dehumidifier, a cooled concentrated liquid desiccant stream is used to dehumidify a humid air stream to produce a dehumidified air stream and a diluted liquid desiccant stream; The regenerator uses a stream of dry air to regenerate the diluted liquid desiccant stream into a concentrated liquid desiccant stream. The electrical energy is supplied to the vacuum membrane dehumidification module, which includes a feed chamber, one or more permeable cavities, and a vacuum pumping module. and The dehumidified airflow is further dehumidified by feeding it into the feed chamber, and a vacuum environment is created in the permeable cavity, so that water vapor in the dehumidified airflow permeates into the permeable cavity due to the water vapor pressure difference, thereby obtaining a deeply dehumidified airflow for delivery to the user.

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