All-weather temperature control and dehumidification water collection system for island plant factory

Abstract

The invention discloses an all-weather temperature control and dehumidification water collection system for an island plant factory. The all-weather temperature control and dehumidification water collection system comprises a photovoltaic photo-thermal double-effect energy collection unit, a double-bed alternate adsorption type refrigeration unit, a double-temperature-zone phase change energy storage unit, a dehumidification water collection unit, a high-temperature working medium pipeline, a refrigerant circulation pipeline and a low-temperature working medium pipeline. Through dynamic coupling of the double-bed alternate adsorption type refrigeration unit and the double-temperature-zone phase change energy storage unit, an all-weather continuous operation energy gradient utilization system is constructed, the two adsorption beds adopt a day and night alternate desorption-adsorption working mode, and the PCM high-temperature heat storage tank stores solar heat energy for desorption of the adsorption beds at night. And the PCM low-temperature heat storage tank stores the cooling capacity of the evaporator for cooling and refrigerating the daytime adsorption bed, so that the intermittent working mode limitation of daytime desorption and night refrigeration of a traditional solar refrigeration system is broken through, and all-weather refrigeration temperature control of the plant factory is realized.

Description

Technical Field

[0001] This invention relates to the field of island agricultural engineering and renewable energy utilization technology, and in particular to an all-weather temperature control and dehumidification water collection system for island plant factories. Background Technology

[0002] Plant factories are modern agricultural systems that achieve year-round continuous crop production through high-precision environmental control. Their core characteristic lies in breaking free from dependence on the natural environment by artificially controlling key growth factors such as light, temperature, humidity, CO2 concentration, and nutrient supply to achieve efficient, high-quality, and safe crop production. Compared to traditional agriculture, plant factories offer environmental controllability, resource efficiency, intensive production, and technological integration; they integrate technologies from multiple disciplines, including agricultural engineering, energy engineering, information technology, and materials science. In island development, plant factories possess strong applicability and strategic value, primarily in adapting to extreme environments, overcoming resource constraints, and ensuring food security. Plant factories can achieve "on-site production and immediate supply," reducing dependence on external supply chains.

[0003] Currently, island plant factories often rely on diesel generators for energy supply, while also exploring renewable energy technologies such as solar power. For freshwater acquisition, traditional seawater desalination or independent air-to-water extraction equipment is commonly used. In the high-humidity environment of islands, mechanical dehumidifiers are primarily used to reduce humidity, with the condensation heat generated during dehumidification being directly discharged to the outside through a heat dissipation device. However, this approach has gradually revealed numerous problems in practical operation. Current technological bottlenecks are mainly reflected in the following aspects: When island electricity relies on diesel generators, there are issues of high cost and heavy pollution. While solar adsorption refrigeration utilizes renewable energy, it is limited by the periodic desorption-adsorption of the adsorbent, leading to refrigeration interruptions at night due to lack of solar radiation, making 24-hour continuous temperature control impossible and severely impacting crop growth. Island freshwater resources are scarce, and traditional seawater desalination and independent air-to-water extraction equipment are energy-intensive. Mechanical dehumidification in the high-humidity environment of islands is costly, and the direct discharge of condensation heat results in energy waste. Furthermore, the independent operation of refrigeration, dehumidification, and water extraction equipment, lacking coordinated heat utilization, leads to overall low system efficiency. Salt spray environments shorten the lifespan of metal components, and conventional materials require frequent maintenance, increasing operating costs. Although current research attempts to combine phase change energy storage with adsorption refrigeration, phase change materials are mostly of a single type, failing to achieve heat gradient matching. For metal-organic framework (MOF) air-to-water technology, existing devices are not coupled and coordinated with the refrigeration system, resulting in wasted condensation heat and equipment redundancy, making it difficult to meet the compact and efficient requirements of island plant factories.

[0004] To address the shortcomings of existing technologies, it is necessary to design an all-weather temperature control and dehumidification water collection system for island plant factories. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an all-weather temperature control and dehumidification water collection system for island plant factories.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an all-weather temperature control and dehumidification water collection system for an island plant factory, comprising a photovoltaic and solar thermal dual-effect energy collection unit, a dual-bed alternating adsorption refrigeration unit, a dual-temperature zone phase change energy storage unit, a dehumidification water collection unit, a high-temperature working fluid pipeline, a refrigerant circulation pipeline, and a low-temperature working fluid pipeline; the photovoltaic and solar thermal dual-effect energy collection unit integrates photovoltaic panels and a collector, with the collector containing heat transfer oil as the heat transfer working fluid; the dual-bed alternating adsorption refrigeration unit includes an adsorption bed A, a shared condenser, an evaporator, and an adsorption bed B; the dehumidification water collection unit includes a MOFs adsorption tower and a freshwater tank; the dual-temperature zone phase change energy storage unit includes a PCM low-temperature heat storage tank and a PCM high-temperature heat storage tank; the outlet of the collector is connected to the heat transfer oil inlet of the MOFs adsorption tower and adsorption bed A respectively through the high-temperature working fluid pipeline; the steam inlet of adsorption bed A is connected to the outlet of the evaporator through the refrigerant circulation pipeline; the MOFs adsorption tower and the adsorption bed A are connected to the heat transfer oil inlet of the evaporator. The vapor outlet of adsorption bed A is connected to the inlet of the common condenser via a refrigerant circulation pipeline. The heat transfer oil outlets of the MOFs adsorption tower and adsorption bed A are connected to the inlet of the common condenser via a high-temperature working fluid pipeline. The liquid water outlet of the common condenser is connected to the inlet of the evaporator and the fresh water tank via a refrigerant circulation pipeline. The heat transfer oil outlet of the common condenser is connected to the inlet of the PCM high-temperature heat storage tank via a high-temperature working fluid pipeline. The outlet of the PCM high-temperature heat storage tank is connected to the inlet of the collector via a high-temperature working fluid pipeline. The outlet of the evaporator is connected to the vapor inlet of adsorption bed B via a refrigerant circulation pipeline. The vapor outlet of adsorption bed B is connected to the inlet of the common condenser via a refrigerant circulation pipeline. The PCM low-temperature heat storage tank is connected to the evaporator via a low-temperature working fluid pipeline to form a low-temperature loop, and connected to adsorption bed B to form a cooling loop. The PCM high-temperature heat storage tank is connected to adsorption bed B via a high-temperature working fluid pipeline to form a heating loop.

[0007] Furthermore, the dual-temperature zone phase change energy storage unit also includes a first circulation pump, a third circulation pump, and a fourth circulation pump;

[0008] The specific cooling process for a plant factory under daytime operating conditions is as follows:

[0009] During the day, the heat transfer oil in the collector heats up, and the first circulation pump circulates the heat transfer oil to the MOFs adsorption tower and adsorption bed A for heat exchange. The water vapor generated after heat exchange in adsorption bed A is transferred to a common condenser to condense into liquid water, and the liquid water is transferred to an evaporator to evaporate into water vapor. The third circulation pump circulates the coolant in the PCM low-temperature heat storage tank to adsorption bed B for heat exchange. After heat exchange, adsorption bed B cools down and continuously adsorbs the water vapor generated in the evaporator. The liquid water in the evaporator continuously evaporates and absorbs heat, providing daytime cooling for the plant factory.

[0010] The cooling system of the plant factory under nighttime operating conditions is as follows:

[0011] At night, the third circulation pump circulates the heated heat transfer oil in the PCM high-temperature heat storage tank to the adsorption bed B. After heat exchange, the adsorption bed B generates water vapor, which is transferred to the common condenser to release heat and condense into liquid water. The liquid water is then transferred to the evaporator to evaporate into water vapor. The adsorption bed A cools naturally at night and continuously adsorbs the water vapor generated by the evaporator. The liquid water in the evaporator continuously evaporates and absorbs heat, providing nighttime cooling for the plant factory.

[0012] Excess cold storage at night:

[0013] The fourth circulation pump is located between the evaporator and the PCM low-temperature heat storage tank. It circulates the coolant in the PCM low-temperature heat storage tank to the evaporator, absorbs its excess cold energy, and then transfers it to the PCM low-temperature heat storage tank for storage in the form of latent heat.

[0014] Furthermore, the heat transfer oil outlet of the MOFs adsorption tower and adsorption bed A transmits the heat-exchanged heat transfer oil to the common condenser. The heat transfer oil that absorbs the condensation heat of water vapor in the common condenser is transmitted to the PCM high-temperature heat storage tank for heat exchange and stores the heat generated in the form of latent heat. After heat exchange, the heat transfer oil is cooled at the outdoor temperature and returned to the collector through the high-temperature working fluid pipeline.

[0015] Furthermore, the dehumidification and water collection unit also includes a second circulation pump, which is installed between the common condenser and the freshwater tank to pump the condensed liquid water to the freshwater tank.

[0016] Furthermore, the dual-bed alternating adsorption refrigeration unit also includes a first three-way valve and a second three-way valve; the first three-way valve is connected to the solar collector, the MOFs adsorption tower, and adsorption bed A respectively; the second three-way valve is connected to the MOFs adsorption tower, adsorption bed A, and a common condenser respectively, and a first circulation pump is located between the solar collector and the first three-way valve; the dual-temperature zone phase change energy storage unit also includes a third three-way valve, a fourth three-way valve, and a fifth three-way valve; the third three-way valve is connected to the evaporator, the fourth three-way valve, and the PCM low-temperature heat storage tank respectively, the fourth three-way valve is connected to the third three-way valve, adsorption bed B, and the PCM high-temperature heat storage tank respectively, and the fifth three-way valve is connected to the PCM low-temperature heat storage tank, the PCM high-temperature heat storage tank, and adsorption bed B respectively, and a third circulation pump is located between the fifth three-way valve and adsorption bed B.

[0017] Furthermore, a first shut-off valve is installed on the pipeline between the solar collector and the first circulating pump, a second shut-off valve is installed on the pipeline between the shared condenser and the PCM high-temperature heat storage tank, a third shut-off valve is installed on the pipeline between the evaporator and the adsorption bed B, a fourth shut-off valve is installed on the pipeline between the PCM high-temperature heat storage tank and the solar collector, and a fifth shut-off valve is installed on the pipeline between the adsorption bed A and the evaporator.

[0018] Furthermore, the MOFs adsorption tower integrates a multi-layer adsorption module supported by a high thermal conductivity carbon fiber reinforced composite material skeleton, filled with MOFs adsorbent and encapsulated in a waterproof and breathable membrane. The tower is equipped with a spiral heat-conducting oil coil, a bottom air inlet connected to a fan, and a top outlet for desorbed, dried air transported to a shared condenser. Adsorption bed A has a built-in spiral heat-conducting oil coil, and the annular space in the middle of the tank is filled with a silica gel-lithium chloride composite adsorbent. Adsorption bed B has a built-in submerged serpentine tube, and the middle of the tank is filled with silica gel-lithium chloride composite adsorbent. The lithium chloride composite adsorbent is wrapped with a waterproof and breathable membrane on the outer layer and fixed to the tank body by flanges. The evaporator is a plate evaporator and the common condenser is a shell and tube condenser. The tube side is a stainless steel corrugated pipe, which is connected in parallel to the refrigerant vapor desorbed from adsorption bed A and adsorption bed B and the water vapor desorbed from MOFs adsorption tower. The shell side is equipped with baffles to connect the high-temperature working fluid pipeline. The PCM low-temperature heat storage tank has a built-in submerged serpentine tube with ethylene glycol aqueous solution flowing inside the tube. The PCM high-temperature heat storage tank has a built-in spiral heat transfer oil coil.

[0019] Furthermore, the MOFs material uses a composite adsorbent of lithium chloride supported on a chromium-based metal-organic framework MIL-101(Cr), the PCM low-temperature thermal storage tank uses sodium acetate trihydrate-glycerol eutectic hydrate as a phase change material, and the PCM high-temperature thermal storage tank uses a modified paraffin-based composite material as a phase change material filler.

[0020] This invention also provides a refrigeration method, including daytime refrigeration in a plant factory: when the connections of the first three-way valve and the second three-way valve are both open, the connection between the fifth three-way valve and the PCM low-temperature heat storage tank and the adsorption bed B is open, the connection between the fourth three-way valve and the adsorption bed B and the third three-way valve is open, and the connection between the third three-way valve and the fourth three-way valve and the PCM low-temperature heat storage tank is open; the collector absorbs waste heat from the photovoltaic panel and solar radiation heat to heat the heat transfer oil in the collector; the first circulating pump delivers the heated heat transfer oil along the main heat transfer oil pipeline to the first three-way valve; the heat transfer oil is divided into two branches at the first three-way valve and delivered to the adsorption bed A and the MOF tower respectively; the heat transfer oil is then transported through a spiral heat transfer oil coil to... The silica-lithium chloride composite adsorbent and MOFs material are heated, and after heat exchange, the heat transfer oil is transported to a common condenser to absorb the condensation heat of water vapor. After the temperature rises, it enters the PCM high-temperature heat storage tank, where the modified paraffin-based composite material inside the tank is heated by a built-in spiral tube heat exchanger to melt it, storing the heat in the form of latent heat. After heat exchange, the heat transfer oil is cooled at outdoor temperature and returns to the collector, completing the cycle. After heating, the silica-lithium chloride composite adsorbent and MOFs material desorb dry water vapor. The water vapor enters the common condenser through pipelines, releases heat, and condenses into liquid water. Part of it is filtered and transported by the second circulation pump to a freshwater tank for water supply to the plant factory; the other part of the liquid water enters the evaporator and evaporates into water vapor. Meanwhile, the sodium acetate trihydrate-glycerol eutectic hydrate phase change material that solidifies overnight in the PCM low-temperature heat storage tank exchanges heat with the ethylene glycol aqueous solution flowing inside the built-in submerged serpentine tube. After cooling, the ethylene glycol aqueous solution is transported to the adsorption bed B by the third circulation pump and exchanges heat with the silica gel-lithium chloride composite adsorbent through the built-in submerged serpentine tube. After being cooled, the silica gel-lithium chloride composite adsorbent continuously adsorbs the water vapor generated in the evaporator. The liquid water in the evaporator continuously evaporates and absorbs heat, thus cooling the plant factory.

[0021] Furthermore, this includes nighttime cooling for the plant factory: when the connections of the first and second three-way valves are closed, the connection between the fifth three-way valve and the PCM high-temperature heat storage tank and adsorption bed B is open, the connection between the fourth three-way valve and the adsorption bed B and the PCM high-temperature heat storage tank is open, and the connection between the third three-way valve and the evaporator and the PCM low-temperature heat storage tank is open; the liquid paraffin-based composite material melted during the day in the PCM high-temperature heat storage tank heats the heat transfer oil through a built-in spiral tube heat exchanger. The heated heat transfer oil is then transported by the third circulation pump to the adsorption bed B, where it exchanges heat with the silica-lithium chloride composite adsorbent through a built-in submerged serpentine tube. After being heated, the silica-lithium chloride composite adsorbent desorbs... Dry water vapor enters a shared condenser through pipes, releasing heat and condensing into liquid water. The liquid water then enters an evaporator and evaporates back into water vapor. Simultaneously, adsorption bed A cools naturally under the influence of the outdoor environment at night. After cooling, the adsorbent continuously adsorbs the water vapor generated in the evaporator. The liquid water in the evaporator continuously evaporates and absorbs heat to cool the plant factory. The ethylene glycol aqueous solution in the pipe connecting the evaporator and the PCM low-temperature heat storage tank absorbs excess cold in the evaporator and is then transported to the PCM low-temperature heat storage tank by the fourth circulation pump. It exchanges heat with the sodium acetate trihydrate-glycerol eutectic hydrate phase change material in the tank through a built-in submerged serpentine tube heat exchanger, causing the phase change material to change from liquid to solid, storing the cold in the form of latent heat.

[0022] Beneficial effects:

[0023] 1. This invention constructs an all-weather, continuously operating energy cascade utilization system through the dynamic coupling of a dual-bed alternating adsorption refrigeration unit and a dual-temperature zone phase change energy storage unit. The two adsorption beds adopt an alternating desorption-adsorption working mode during the day and night. The high-temperature PCM thermal storage tank stores solar thermal energy for desorption in the adsorption bed at night, while the low-temperature PCM thermal storage tank stores evaporator cooling energy for cooling the adsorption bed during the day. This breaks through the intermittent working mode limitation of traditional solar refrigeration systems, which involves desorption during the day and cooling at night. It realizes energy supply across time periods and all-weather temperature control for plant factories. At night, the MOFs adsorption tower adsorbs water vapor in the air under low-temperature conditions, which can reduce the ambient humidity. Energy efficiency is improved through dual-temperature zone energy storage and condensation heat recovery. This invention solves the problems of energy shortage, freshwater scarcity, and high humidity environment in island plant factories and is suitable for compact and efficient operation under isolated power grid conditions.

[0024] 2. This invention establishes a multifunctional unit condensation heat recovery system, integrating the condensers of the dual-bed alternating adsorption refrigeration unit and the water collection unit into a single design. This allows the refrigerant vapor condensation and water collection to share the same condenser, and the latent heat of condensation is recovered to the PCM high-temperature heat storage tank via a high-temperature working fluid pipeline for heat supply during adsorbent desorption. This design helps improve system energy utilization and reduce equipment footprint.

[0025] 3. This invention designs a dual-temperature zone phase change energy storage unit for different heat exchange conditions. The PCM high-temperature heat storage tank uses a spiral tube heat exchanger coupled with high-temperature phase change material to enhance heat transfer stability under high-temperature conditions. The PCM low-temperature heat storage tank is equipped with an immersed serpentine tube heat exchanger and low-temperature phase change material to achieve rapid cold energy storage / release by expanding the contact area. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the all-weather temperature control, dehumidification, and water collection system for the island plant factory of the present invention;

[0027] Figure 2 This is a schematic diagram of the daytime operation of the all-weather temperature control and dehumidification water collection system of the present invention;

[0028] Figure 3 This is a schematic diagram of the nighttime operation of the all-weather temperature control and dehumidification water collection system of the present invention;

[0029] Figure 4 This refers to the average daily photovoltaic power generation of the system of this invention in each month;

[0030] Figure 5 This refers to the daily heat supply required by the system of this invention;

[0031] Figure 6 This refers to the average daily heat supply of the solar thermal system of this invention;

[0032] In the diagram: 1. Photovoltaic and solar thermal dual-effect energy collection unit; 2. First shut-off valve; 3. First circulation pump; 4. First three-way valve; 5. MOFs adsorption tower; 6. Second circulation pump; 7. Fresh water tank; 8. Adsorption bed A; 9. Second three-way valve; 10. Shared condenser; 11. Second shut-off valve; 12. Evaporator; 13. Third shut-off valve; 14. Third three-way valve; 15. PCM low-temperature thermal storage tank; 16. Fourth three-way valve; 17. Adsorption bed B; 18. Third circulation pump; 19. Fifth three-way valve; 20. PCM high-temperature thermal storage tank; 21. Fourth shut-off valve; 22. Fifth shut-off valve; 23. Fourth circulation pump. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Reference Figure 1-6To achieve the above objectives, the present invention adopts the following technical solution: an all-weather temperature control and dehumidification water collection system for an island plant factory, comprising a photovoltaic and solar thermal dual-effect energy collection unit 1, a dual-bed alternating adsorption refrigeration unit, a dual-temperature zone phase change energy storage unit, a dehumidification water collection unit, a high-temperature working fluid pipeline, a refrigerant circulation pipeline, and a low-temperature working fluid pipeline; the photovoltaic and solar thermal dual-effect energy collection unit 1 integrates a photovoltaic panel and a collector, with the collector containing heat transfer oil as the heat transfer medium; the photovoltaic panel can be used for power generation, and the collector simultaneously absorbs the waste heat from the photovoltaic panel and solar radiation heat to heat the internal high-temperature heat transfer medium; the heat transfer oil can be an alkylbenzene type synthetic heat transfer oil with high specific heat capacity and low viscosity; the high-temperature working fluid pipeline can be made of 316L stainless steel, which has high corrosion resistance; and the pipelines are connected by flanges.

[0035] The photovoltaic panel uses high-efficiency monocrystalline silicon modules with a photoelectric conversion efficiency of ≥22%. Its back side is integrated with the solar collector, enabling efficient recovery of photovoltaic waste heat and solar radiation heat. The solar collector can use a copper-aluminum composite heat-absorbing plate with a selective absorption coating, achieving an absorption rate of ≥95% and an emissivity of ≤5%. Its theoretical heat absorption can be quantified using the following formula:

[0036] Q total =Q th +Q pv-loss

[0037] Q th =A g ·[τα·IU L ·(T m -T a )]

[0038] Q pv-loss =A pv ·I·(1-η pv )·η cool

[0039] Among them, Q total Q represents the total heat absorption of the solar collector (J); th Q represents the amount of solar radiation heat absorbed by the collector (J); pv-loss The amount of waste heat absorbed by the photovoltaic panel (J) represents the amount of heat absorbed by the collector; A g Represents the area of ​​the solar collector (m²) 2 ); τα represents the percentage (%) of solar radiation that passes through the cover plate and is absorbed by the absorber plate; I represents the solar radiation intensity (W / m²). 2 );U L The total heat loss coefficient of the solar collector (W / m) 2 ·K); T m T represents the average temperature (K) of the solar collector. a Represents ambient temperature (K); A pv Represents the area of ​​photovoltaic panels (m²)2 );η pv Represents the photovoltaic panel's photoelectric conversion efficiency (%); η cool This represents the heat transfer efficiency (%) from the photovoltaic panel to the solar collector.

[0040] In this embodiment, the dual-bed alternating adsorption refrigeration unit uses water as the refrigerant. The refrigerant circulation pipeline can be made of 316L stainless steel, and the pipelines are connected by flanges. A 20mm thick polyurethane foam insulation layer is used on the outside of the pipelines to reduce heat loss. Except for the section from the PCM high-temperature storage tank 20 to the collector, the remaining high-temperature working fluid pipelines use a 40mm thick polyurethane foam insulation layer to reduce heat loss from the heat transfer oil. All three-way valves are diversion type three-way valves, and the flow distribution ratio is adjusted by the valve opening. All circulation pumps are frequency converter controlled.

[0041] The dual-bed alternating adsorption refrigeration unit includes an adsorption bed A8, a common condenser 10, an evaporator 12, and an adsorption bed B17. The dehumidification and water collection unit includes a MOFs adsorption tower 5 and a fresh water tank 7. The dual-temperature zone phase change energy storage unit includes a PCM low-temperature heat storage tank 15 and a PCM high-temperature heat storage tank 20.

[0042] The outlet of the solar collector is connected to the heat transfer oil inlet of MOFs adsorption tower 5 and adsorption bed A8 via a high-temperature working fluid pipeline; the steam inlet of adsorption bed A8 is connected to the outlet of evaporator 12 via a refrigerant circulation pipeline; the steam outlets of MOFs adsorption tower 5 and adsorption bed A8 are connected to the inlet of common condenser 10 via a refrigerant circulation pipeline; the heat transfer oil outlets of MOFs adsorption tower 5 and adsorption bed A8 are connected to the inlet of common condenser 10 via a high-temperature working fluid pipeline; the liquid water outlet of common condenser 10 is connected to the inlet of evaporator 12 and freshwater tank 7 via a refrigerant circulation pipeline; the heat transfer oil outlet of common condenser 10 is connected to the inlet of PCM high-temperature heat storage tank 20 via a high-temperature working fluid pipeline; and the outlet of PCM high-temperature heat storage tank 20 is connected to the inlet of solar collector via a high-temperature working fluid pipeline.

[0043] The outlet of evaporator 12 is connected to the steam inlet of adsorption bed B17 via a refrigerant circulation pipeline; the steam outlet of adsorption bed B17 is connected to the inlet of common condenser 10 via a refrigerant circulation pipeline; PCM low-temperature heat storage tank 15 is connected to evaporator 12 via low-temperature working fluid pipeline to form a low-temperature circuit, and connected to adsorption bed B17 to form a cooling circuit; PCM high-temperature heat storage tank 20 is connected to adsorption bed B17 via high-temperature working fluid pipeline to form a heating circuit.

[0044] In this embodiment, the MOFs adsorption tower 5 can be a vertical cylinder made of 316L stainless steel. To reduce wind resistance, the height-to-diameter ratio is approximately 3:1 to 5:1. The tower integrates multiple adsorption modules supported by a high thermal conductivity carbon fiber reinforced composite material frame. These modules are filled with MOFs adsorbent and encapsulated in a waterproof and breathable membrane. The water production rate can be flexibly adjusted by increasing the number of modules. A spiral heat transfer oil coil is installed inside the tower for heating and desorbing the MOFs during the day. A fan is connected to the bottom air inlet, and the desorbed dry air is discharged from the top and connected to a shared condenser via piping. The tank is covered with a 100mm thick polyurethane insulation layer.

[0045] MOFs materials can be selected using a composite adsorbent of lithium chloride supported on a chromium-based metal-organic framework MIL-101(Cr). This composite adsorbent is prepared by an ion solution permeation method: MIL-101(Cr) powder is immersed in a saturated LiCl aqueous solution and stirred at room temperature for 24 hours to allow LiCl to permeate into the pores through capillary action; after centrifugation, it is vacuum dried at 80°C for 12 hours to remove surface free water, forming a LiCl@MIL-101(Cr) composite material.

[0046] During system operation, at night, low-temperature and high-humidity air enters the MOFs adsorption tower 5 through a fan, where the MOFs adsorb moisture. During the day, the heat transfer oil heated by solar energy enters the spiral heat transfer oil coil inside the MOFs adsorption tower 5, heating the MOFs material to desorb water vapor. The water vapor is condensed into liquid in the common condenser 10 and enters the freshwater tank for water supply to the plant factory.

[0047] In this embodiment, the outer shell of adsorption bed A8 is a vertical cylindrical 316L stainless steel tank, covered with a 50mm polyurethane insulation layer, and has an internal spiral heat transfer oil coil. The annular space in the middle of the tank is filled with silica-lithium chloride composite adsorbent, and the outer layer of the adsorbent is wrapped with a waterproof and breathable membrane, which is fixed to the tank by a flange to prevent adsorbent particle leakage and LiCl solution seepage. The outer shell of adsorption bed B17 is a horizontal cylindrical 316L stainless steel tank, covered with a 50mm polyurethane insulation layer, and has an internal submerged serpentine tube. The middle of the tank is filled with silica-lithium chloride composite adsorbent, and the outer layer of the adsorbent is wrapped with a waterproof and breathable membrane, which is fixed to the tank by a flange to prevent adsorbent particle leakage and LiCl solution seepage.

[0048] The composite adsorbent can be prepared by impregnation: First, mesoporous silica gel particles are dried at 120℃ for 4 hours to remove moisture and impurities from the pores; then, a 30% (w / w) LiCl aqueous solution is prepared, and the dried silica gel is completely immersed. The mixture is then left to stand in a sealed container for 24 hours to ensure that LiCl fully penetrates the pores; the particles and solution are separated using a vacuum filter to remove excess LiCl solution adhering to the surface; the wet particles are then dried a second time at 120℃ to constant weight; finally, the dried particles are packed into a custom-made waterproof and breathable membrane bag and sealed using ultrasonic welding. The heat required for desorption in a single adsorption bed can be quantified by the following formula:

[0049] Q desorp =m ads ·(q des -q ads )·Δh des +m ads ·c ads ·(T des -T ads )

[0050] Among them, Q desorp This represents the total heat (J) required for desorption in a single adsorption bed; m ads q represents the mass of the adsorbent (kg); des q represents the amount of water vapor adsorbed by the adsorbent after desorption (kg / kg adsorbent); ads Δh represents the amount of water vapor adsorbed by the adsorbent after adsorption (kg / kg adsorbent); des Represents the enthalpy difference (kJ / kg) before and after water vapor desorption; c ads T represents the specific heat capacity of the adsorbent (kJ / kg K); des T represents the desorption temperature of the adsorbent (K); ads This represents the adsorption temperature of the adsorbent (K). The cooling required for adsorption in a single adsorption bed can be quantified by the following formula:

[0051] Q adsorp =m ads ·(q ads -q des )·Δh ads +m ads ·c ads ·(T ads -T des )

[0052] Among them, Q adsorp This represents the total cooling capacity (J) required for adsorption in a single adsorption bed; m ads q represents the mass of the adsorbent (kg); ads q represents the amount of water vapor adsorbed by the adsorbent after adsorption (kg / kg adsorbent); desΔh represents the amount of water vapor adsorbed by the adsorbent after desorption (kg / kg adsorbent); das Represents the enthalpy difference (kJ / kg) before and after water vapor adsorption; c ads T represents the specific heat capacity of the adsorbent (kJ / kg·K); ads T represents the adsorption temperature of the adsorbent (K); des This represents the desorption temperature (K) of the adsorbent.

[0053] In this embodiment, the evaporator 12 can be a plate evaporator, and the common condenser 10 is a shell and tube condenser with stainless steel corrugated tubes in the tube side. The tube side of the common condenser 10 is designed as a dual-channel, which is connected in parallel to the refrigerant vapor desorbed from the adsorption bed A 8 and the adsorption bed B 17 and the water vapor desorbed from the MOFs adsorption tower 5. The shell side is equipped with baffles to enhance heat transfer and is connected to a high-temperature working fluid pipeline. The latent heat released during the condensation process is recovered through the high-temperature working fluid pipeline.

[0054] In this embodiment, the PCM high-temperature thermal storage tank 20 can use a modified paraffin-based composite material as the phase change material filler, with a phase change temperature of approximately 60°C, a phase change enthalpy ≥200kJ / kg, and a thermal conductivity ≥0.5W / (m·K). The modified paraffin-based composite material is a composite phase change material in which high thermal conductivity fillers (such as expanded graphite, metal particles, foamed metal, graphite foam, etc.) are added to the paraffin phase change material. To enhance convective heat transfer within the PCM high-temperature thermal storage tank 20, a spiral heat transfer oil coil is built into the PCM high-temperature thermal storage tank 20.

[0055] The PCM low-temperature thermal storage tank 15 can use sodium acetate trihydrate-glycerol eutectic hydrate as a phase change material. The phase change temperature is about 15℃, the phase change enthalpy is ≥180kJ / kg, and the thermal conductivity is ≥0.5W / (m·K). To overcome the problems of high viscosity and solid-state thermal conductivity at low temperatures, the PCM low-temperature thermal storage tank 15 has a built-in submerged serpentine tube, and the ethylene glycol aqueous solution flows inside the tube.

[0056] The heat / cold storage capacity of a phase change material thermal storage tank can be quantified by the following formula:

[0057] Q s =m PCM ·ΔH latent +m PCM ·c p,PCM ·(T pc -T a )

[0058] Where Qs represents the total heat / cold storage capacity (J) of the phase change material thermal storage tank; m PCM Represents the mass (kg) of the phase change material; ΔH latent Represents the enthalpy difference (kJ / kg) before and after the phase change of the phase change material; c p,PCM T represents the sensible specific heat capacity of phase change materials (kJ / kg·K); pcT represents the phase transition temperature (K) of the phase change material. a Represents ambient temperature (K).

[0059] Both PCM thermal storage tanks feature double-layered 316L stainless steel jackets filled with 50mm thick polyurethane foam, enhancing insulation performance while resisting salt spray corrosion. The heat exchange coils in both PCM thermal storage tanks can be made of copper with a nickel-plated surface for corrosion protection.

[0060] The dual-temperature zone phase change energy storage unit also includes a first circulation pump 3, a third circulation pump 18 and a fourth circulation pump 23;

[0061] The specific cooling process for a plant factory under daytime operating conditions is as follows:

[0062] During the day, the heat transfer oil in the collector heats up, and the first circulation pump 3 circulates and pumps the heat transfer oil to the MOFs adsorption tower 5 and adsorption bed A8 for heat exchange. The water vapor generated after heat exchange in the adsorption bed A8 is transferred to the common condenser 10 and condensed into liquid water. The liquid water is then transferred to the evaporator 12 and evaporated into water vapor. The third circulation pump 18 circulates and pumps the coolant in the PCM low-temperature heat storage tank 15 to the adsorption bed B17 for heat exchange. After heat exchange, the adsorption bed B17 cools and continuously adsorbs the water vapor generated in the evaporator 12. The liquid water in the evaporator 12 continuously evaporates and absorbs heat, providing daytime cooling for the plant factory.

[0063] The cooling system of the plant factory under nighttime operating conditions is as follows:

[0064] At night, the third circulation pump 18 circulates the heated heat transfer oil in the PCM high-temperature heat storage tank 20 to the adsorption bed B17. After heat exchange, the adsorption bed B17 generates water vapor, which is transferred to the common condenser 10 to release heat and condense into liquid water. The liquid water is transferred to the evaporator 12 to evaporate into water vapor. The adsorption bed A8 cools naturally at night and continuously adsorbs the water vapor generated by the evaporator 12. The liquid water in the evaporator 12 continuously evaporates and absorbs heat, providing nighttime cooling for the plant factory.

[0065] Excess cold storage at night:

[0066] The fourth circulation pump 23 is installed between the evaporator 12 and the PCM low-temperature heat storage tank 15. It circulates the coolant in the PCM low-temperature heat storage tank 15 to the evaporator 12, absorbs its excess cold energy, and then transfers it to the PCM low-temperature heat storage tank 15 for storage in the form of latent heat.

[0067] The circulation of the heat transfer oil is as follows:

[0068] The heat transfer oil outlets of MOFs adsorption tower 5 and adsorption bed A8 transfer the heat-exchanged heat transfer oil to the common condenser 10. The heat transfer oil that absorbs the condensation heat of water vapor in the common condenser 10 is transferred to the PCM high-temperature heat storage tank 20 for heat exchange and stores the heat generated in the form of latent heat. After heat exchange, the heat transfer oil is cooled at the outdoor temperature and returned to the collector through the high-temperature working fluid pipeline.

[0069] The dehumidification and water collection process specifically involves:

[0070] The dehumidification and water collection unit also includes a second circulation pump 6, which is set between the common condenser 10 and the fresh water tank 7 to pump the condensed liquid water to the fresh water tank 7. At night, the MOFs adsorption tower adsorbs water vapor in the air at low temperature, which can reduce the ambient humidity.

[0071] Further explanation of the dual-bed alternating adsorption refrigeration unit: it also includes a first three-way valve 4 and a second three-way valve 9; the first three-way valve 4 is connected to the solar collector, the MOFs adsorption tower 5 and the adsorption bed A8 respectively; the second three-way valve 9 is connected to the MOFs adsorption tower 5, the adsorption bed A8 and the common condenser 10 respectively; and the first circulating pump 3 is located between the solar collector and the first three-way valve 4.

[0072] The dual-temperature zone phase change energy storage unit also includes a third three-way valve 14, a fourth three-way valve 16, and a fifth three-way valve 19. The third three-way valve 14 is connected to the evaporator 12, the fourth three-way valve 16, and the PCM low-temperature heat storage tank 15, respectively. The fourth three-way valve 16 is connected to the third three-way valve 14, the adsorption bed B17, and the PCM high-temperature heat storage tank 20, respectively. The fifth three-way valve 19 is connected to the PCM low-temperature heat storage tank 15, the PCM high-temperature heat storage tank 20, and the adsorption bed B17, respectively. The third circulation pump 18 is located between the fifth three-way valve 19 and the adsorption bed B17.

[0073] Setting of the shut-off valve:

[0074] A first shut-off valve 2 is installed on the pipeline between the solar collector and the first circulating pump; a second shut-off valve 11 is installed on the pipeline between the shared condenser 10 and the PCM high-temperature heat storage tank 20; a third shut-off valve 13 is installed on the pipeline between the evaporator 12 and the adsorption bed B17; a fourth shut-off valve 21 is installed on the pipeline between the PCM high-temperature heat storage tank 20 and the solar collector; and a fifth shut-off valve 22 is installed on the pipeline between the adsorption bed A8 and the evaporator 12.

[0075] This invention provides a refrigeration method based on an all-weather temperature control and dehumidification water collection system for an island plant factory, achieving alternating refrigeration during the day and night, as detailed below:

[0076] like Figure 2 The figure shows a schematic diagram of the daytime operating system of the present invention. The dotted lines in the figure represent the high-temperature heat transfer medium heat transfer oil pipeline, the dashed lines represent the low-temperature heat transfer medium ethylene glycol aqueous solution pipeline, and the solid lines represent the water pipeline.

[0077] When the connection between the first three-way valve and the second three-way valve is open, the connection between the fifth three-way valve (19) and the PCM low-temperature heat storage tank (15) and the adsorption bed B (17) is open, the connection between the fourth three-way valve and the adsorption bed B (17) and the third three-way valve is open, and the connection between the third three-way valve and the fourth three-way valve and the PCM low-temperature heat storage tank (15) is open;

[0078] The daytime solar collector absorbs waste heat from the photovoltaic panel and solar radiation heat, heating the heat transfer oil in the collector to about 65°C. The first circulation pump 3 delivers the heated heat transfer oil along the main heat transfer oil pipeline to the first three-way valve 4. The heat transfer oil is divided into two branches at the first three-way valve 4 and delivered to the adsorption bed A8 and the MOF tower 5 respectively.

[0079] In adsorption bed A8 and MOFs tower 5, heat transfer oil heats the silica-lithium chloride composite adsorbent and MOFs material to 60°C via spiral heat transfer oil coils. After heat exchange, the heat transfer oil temperature is approximately 55°C. It then absorbs the heat of condensation from water vapor in the shared condenser 10, causing its temperature to rise by about 10°C. The heat transfer oil, after absorbing the waste heat from the shared condenser 10, enters the PCM high-temperature heat storage tank 20. There, it is heated by a built-in spiral tube heat exchanger, causing the modified paraffin-based composite material (with a phase change temperature of approximately 60°C) inside the tank to melt, storing the heat as latent heat. After heat exchange, the heat transfer oil is cooled at outdoor temperature and returns to the collector, completing the cycle.

[0080] After heating, the silica-lithium chloride composite adsorbent and MOFs material desorb high-temperature dry water vapor at 60°C. The water vapor enters the common condenser 10 through the pipeline, releases heat and condenses into liquid water at about 60°C. A portion of the water vapor is filtered and then transported by the second circulation pump to the fresh water tank 7 for water supply in the plant factory.

[0081] Another portion of the liquid water enters evaporator 12 and evaporates into water vapor at 10°C. Simultaneously, the sodium acetate trihydrate-glycerol eutectic hydrate phase change material that solidifies overnight in the PCM low-temperature heat storage tank 15 exchanges heat with the ethylene glycol aqueous solution flowing within the built-in submerged serpentine tube, cooling it to approximately 15°C. After cooling, the ethylene glycol aqueous solution is transported by the third circulation pump 18 to the adsorption bed B17, where it exchanges heat with the silica gel-lithium chloride composite adsorbent through the built-in submerged serpentine tube. Once cooled to 20°C-25°C, the silica gel-lithium chloride composite adsorbent continuously adsorbs the water vapor generated in evaporator 11. The liquid water in evaporator 11 continuously evaporates and absorbs heat, providing cooling for the plant factory.

[0082] Figure 3 This is a schematic diagram of the nighttime operation system of the present invention. In the diagram, the dotted line represents the high-temperature heat transfer medium heat transfer oil pipeline, the dashed line represents the low-temperature heat transfer medium ethylene glycol aqueous solution pipeline, and the solid line represents the water pipeline.

[0083] When the connection between the first three-way valve and the second three-way valve is closed, the connection between the fifth three-way valve (19) and the PCM high-temperature heat storage tank (20) and the adsorption bed B (17) is open, the connection between the fourth three-way valve and the adsorption bed B (17) and the PCM high-temperature heat storage tank (20) is open, and the connection between the third three-way valve and the evaporator (12) and the PCM low-temperature heat storage tank (15) is open;

[0084] The liquid paraffin-based composite material melted during the day in the PCM high-temperature heat storage tank 20 heats the heat transfer oil to about 60°C through a built-in spiral tube heat exchanger. The heated heat transfer oil is then transported by the third circulation pump 18 to the adsorption bed B17, where it exchanges heat with the silica-lithium chloride composite adsorbent through a built-in submerged serpentine tube. After being heated to 60°C, the silica-lithium chloride composite adsorbent desorbs high-temperature dry water vapor at 60°C. This water vapor enters the shared condenser 10 through pipes, releasing heat and condensing into liquid water at approximately 60°C. The liquid water then enters the evaporator 12 and evaporates into water vapor at 10°C. Simultaneously, the adsorption bed A8 cools naturally at night due to the outdoor environment, with the adsorbent cooling to 20°C-25°C, continuously adsorbing the water vapor generated in the evaporator 12. The continuous evaporation and heat absorption of the liquid water in the evaporator 12 provides cooling for the plant factory.

[0085] The ethylene glycol aqueous solution in the connecting pipe between the evaporator 12 and the PCM low-temperature heat storage tank 15 absorbs excess cold energy in the evaporator 12 and cools to about 10°C. Then it is transported to the PCM low-temperature heat storage tank 15 by the fourth circulation pump 23. It exchanges heat with the sodium acetate trihydrate-glycerol eutectic hydrate phase change material in the tank, which has a phase change temperature of about 15°C, through the built-in submerged serpentine tube heat exchanger. This causes the phase change material to change from liquid to solid, and the cold energy is stored in the form of latent heat.

[0086] This embodiment targets a 100-square-meter island plant factory in Sanya, Hainan. The system provided by this invention, taking into account the local climate characteristics of high temperature, strong radiation, and high humidity, has the following specific configuration and operating parameters:

[0087] Photovoltaic and solar thermal dual-effect energy collection unit 1 is configured with 50m 2 Monocrystalline silicon photovoltaic panel (photovoltaic conversion efficiency 22%) and 30m 2The flat-plate photovoltaic water heater uses a copper-aluminum composite absorber plate with a selective absorption coating. It incorporates alkylbenzene-based synthetic heat transfer oil as the high-temperature heat transfer medium and is connected to subsequent units via 316L stainless steel piping (with a 40mm polyurethane insulation layer). Both adsorption beds A and B are filled with 120kg of silica-lithium chloride composite adsorbent. The PCM high-temperature storage tank is filled with 800kg of modified paraffin-based composite phase change material (phase change temperature 60℃, phase change enthalpy 200kJ / kg, sensible heat specific heat capacity 2kJ / kg). The PCM low-temperature thermal storage tank is filled with 600 kg of sodium acetate trihydrate-glycerol eutectic hydrate (phase change temperature 15℃, phase change enthalpy 180 kJ / kg, sensible heat specific heat capacity 2 kJ / kg·K). Both tanks are double-layered 316L stainless steel jackets (with a 50 mm polyurethane insulation layer in the jacket). The MOFs dehumidification and water collection unit is equipped with 80 kg of LiCl@MIL-101(Cr) composite adsorbent (filled in a vertical cylindrical 316L stainless steel adsorption tower, with a height-to-diameter ratio of 4:1), and is equipped with a 1800 m³ / h filtration system. 3 / h air volume fan, freshwater tank volume matches the daily irrigation needs of the plant factory.

[0088] Calculations show that, in this embodiment, the system's average daily photovoltaic power generation for each month is as follows: Figure 4 As shown, photovoltaic power generation is lower in winter, but still above 35 kWh, which can meet the system's operational needs while also covering some of the energy consumption of the LED lights in the plant factory. If conditions permit, photovoltaic power generation can be added to completely cover the energy consumption of the LED lights. The daily heat supply required by the system consists of three parts: the heat required for desorption by the adsorption bed, the heat stored in the high-temperature phase change material storage tank, and the heat required for desorption by MOFs. This is mainly determined by the amount of adsorbent and phase change material filling. Figure 5 As shown, the system requires approximately 350 MJ of heat per day in each month. The average daily heat supply of the solar thermal system consists of waste heat absorbed by the photovoltaic panels and solar radiation heat. Figure 6 As shown, the solar thermal system can provide an average daily heat output of about 600 MJ even in winter, which can meet the system's heat supply needs throughout the year. A 100-square-meter leafy vegetable plant factory requires about 150 L of irrigation water per day. According to calculations, the system produces ≥180 L of fresh water per day through the MOFs dehumidification and water collection function unit, which can meet the irrigation needs of the plant factory crops.

[0089] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A 24 / 7 temperature control, dehumidification, and water collection system for an island plant factory, characterized in that, It includes a photovoltaic and solar thermal dual-effect energy collection unit (1), a dual-bed alternating adsorption refrigeration unit, a dual-temperature zone phase change energy storage unit, a dehumidification and water collection unit, a high-temperature working fluid pipeline, a refrigerant circulation pipeline, and a low-temperature working fluid pipeline; the photovoltaic and solar thermal dual-effect energy collection unit (1) integrates a photovoltaic panel and a collector, and the collector has built-in heat transfer oil as the heat transfer working fluid; the dual-bed alternating adsorption refrigeration unit includes an adsorption bed A (8), a common condenser (10), an evaporator (12), and an adsorption bed B (17); the dehumidification and water collection unit includes a MOFs adsorption tower (5) and a fresh water tank (7); the dual-temperature zone phase change energy storage unit includes a PCM low-temperature heat storage tank (15) and a PCM high-temperature heat storage tank (20); The outlet of the solar collector is connected to the heat transfer oil inlet of the MOFs adsorption tower (5) and the adsorption bed A (8) through a high-temperature working fluid pipeline; the steam inlet of the adsorption bed A (8) is connected to the outlet of the evaporator (12) through a refrigerant circulation pipeline; the steam outlets of the MOFs adsorption tower (5) and the adsorption bed A (8) are connected to the inlet of the common condenser (10) through a refrigerant circulation pipeline; the heat transfer oil outlets of the MOFs adsorption tower (5) and the adsorption bed A (8) are connected to the inlet of the common condenser (10) through a high-temperature working fluid pipeline; the liquid water outlet of the common condenser (10) is connected to the inlet of the evaporator (12) and the fresh water tank (7) through a refrigerant circulation pipeline; the heat transfer oil outlet of the common condenser (10) is connected to the inlet of the PCM high-temperature heat storage tank (20) through a high-temperature working fluid pipeline; and the outlet of the PCM high-temperature heat storage tank (20) is connected to the inlet of the solar collector through a high-temperature working fluid pipeline. The outlet of the evaporator (12) is connected to the steam inlet of the adsorption bed B (17) through the refrigerant circulation pipeline; the steam outlet of the adsorption bed B (17) is connected to the inlet of the common condenser (10) through the refrigerant circulation pipeline; the PCM low-temperature heat storage tank (15) is connected to the evaporator (12) through the low-temperature working fluid pipeline to form a low-temperature circuit, and is connected to the adsorption bed B (17) to form a cooling circuit; the PCM high-temperature heat storage tank (20) is connected to the adsorption bed B (17) through the high-temperature working fluid pipeline to form a heating circuit.

2. The all-weather temperature control and dehumidification water collection system according to claim 1, characterized in that: The dual-temperature zone phase change energy storage unit also includes a first circulation pump (3), a third circulation pump (18), and a fourth circulation pump (23); The specific cooling process for a plant factory under daytime operating conditions is as follows: During the day, the heat transfer oil in the collector heats up, and the first circulation pump (3) pumps the heat transfer oil to the MOFs adsorption tower (5) and adsorption bed A (8) for heat exchange. The water vapor generated after the heat exchange in adsorption bed A (8) is transferred to the common condenser (10) and condensed into liquid water. The liquid water is transferred to the evaporator (12) and evaporated into water vapor. The third circulation pump (18) pumps the coolant in the PCM low-temperature heat storage tank (15) to the adsorption bed B (17) for heat exchange. After the heat exchange in adsorption bed B (17), it cools and continuously adsorbs the water vapor generated in the evaporator (12). The liquid water in the evaporator (12) continuously evaporates and absorbs heat, providing daytime cooling for the plant factory. The cooling system of the plant factory under nighttime operating conditions is as follows: At night, the third circulation pump (18) circulates the heated heat transfer oil in the PCM high-temperature heat storage tank (20) to the adsorption bed B (17). After heat exchange, the adsorption bed B (17) generates water vapor, which is transferred to the common condenser (10) to release heat and condense into liquid water. The liquid water is transferred to the evaporator (12) to evaporate into water vapor. The adsorption bed A (8) naturally cools at night and continuously adsorbs the water vapor generated by the evaporator (12). The liquid water in the evaporator (12) continuously evaporates and absorbs heat, providing nighttime cooling for the plant factory. Excess cold storage at night: The fourth circulation pump (23) is located between the evaporator (12) and the PCM low-temperature heat storage tank (15). It circulates the coolant in the PCM low-temperature heat storage tank (15) to the evaporator (12), absorbs its excess cold energy, and then transfers it to the PCM low-temperature heat storage tank (15) for storage in the form of latent heat.

3. The all-weather temperature control and dehumidification water collection system according to claim 1, characterized in that: The heat transfer oil outlet of the MOFs adsorption tower (5) and adsorption bed A (8) transmits the heat transfer oil after heat exchange to the common condenser (10). The heat transfer oil after absorbing the condensation heat of water vapor in the common condenser (10) is transmitted to the PCM high-temperature heat storage tank (20) for heat exchange and stores the heat generated by heat exchange in the form of latent heat. After heat exchange, the heat transfer oil is cooled at the outdoor temperature and returned to the collector through the high-temperature working fluid pipeline.

4. The all-weather temperature control and dehumidification water collection system according to claim 1, characterized in that: The dehumidification and water collection unit also includes a second circulation pump (6), which is installed between the common condenser (10) and the fresh water tank (7) to pump the condensed liquid water to the fresh water tank (7).

5. The all-weather temperature control and dehumidification water collection system according to claim 2, characterized in that: The dual-bed alternating adsorption refrigeration unit also includes a first three-way valve (4) and a second three-way valve (9); the first three-way valve (4) is connected to the solar collector, the MOFs adsorption tower (5) and the adsorption bed A (8) respectively; the second three-way valve (9) is connected to the MOFs adsorption tower (5), the adsorption bed A (8) and the common condenser (10) respectively; and the first circulating pump (3) is located between the solar collector and the first three-way valve (4); The dual-temperature zone phase change energy storage unit also includes a third three-way valve (14), a fourth three-way valve (16), and a fifth three-way valve (19); the third three-way valve (14) is connected to the evaporator (12), the fourth three-way valve (16), and the PCM low-temperature heat storage tank (15), respectively; the fourth three-way valve (16) is connected to the third three-way valve (14), the adsorption bed B (17), and the PCM high-temperature heat storage tank (20), respectively; the fifth three-way valve (19) is connected to the PCM low-temperature heat storage tank (15), the PCM high-temperature heat storage tank (20), and the adsorption bed B (17), respectively; and the third circulation pump (18) is located between the fifth three-way valve (19) and the adsorption bed B (17).

6. The all-weather temperature control and dehumidification water collection system according to claim 1, characterized in that: A first shut-off valve (2) is installed on the pipeline between the collector and the first circulating pump, a second shut-off valve (11) is installed on the pipeline between the shared condenser (10) and the PCM high-temperature heat storage tank (20), a third shut-off valve (13) is installed on the pipeline between the evaporator (12) and the adsorption bed B (17), a fourth shut-off valve (21) is installed on the pipeline between the PCM high-temperature heat storage tank (20) and the collector, and a fifth shut-off valve (22) is installed on the pipeline between the adsorption bed A (8) and the evaporator (12).

7. The all-weather temperature control and dehumidification water collection system according to claim 1, characterized in that: The MOFs adsorption tower (5) integrates a multi-layer adsorption module, supported by a carbon fiber reinforced composite high thermal conductivity skeleton, filled with MOFs material adsorbent and encapsulated in a waterproof and breathable membrane. The tower is equipped with a spiral heat-conducting oil coil, the bottom air inlet is connected to a fan, and the desorbed dry air is discharged from the top and transmitted to a common condenser (10). Adsorption bed A (8) has a built-in spiral heat transfer oil coil, and the annular space in the middle of the tank is filled with silica gel-lithium chloride composite adsorbent; Adsorption bed B (17) has a built-in submerged serpentine tube, and the middle of the tank is filled with silica gel-lithium chloride composite adsorbent. The outer layer of the adsorbent is wrapped with a waterproof and breathable membrane and fixed to the tank by a flange. The evaporator (12) adopts a plate evaporator, and the common condenser (10) adopts a shell and tube condenser. The tube side is a stainless steel corrugated tube, which is connected in parallel to the refrigerant vapor desorbed from the adsorption bed A (8) and the adsorption bed B (17) and the water vapor desorbed from the MOFs adsorption tower (5). The shell side is equipped with baffles to connect the high-temperature working fluid pipeline. The PCM low-temperature heat storage tank (15) has a built-in submerged serpentine tube, and the liquid flowing in the tube is an ethylene glycol aqueous solution. The PCM high-temperature heat storage tank (20) has a built-in spiral heat transfer oil coil.

8. The all-weather temperature control and dehumidification water collection system according to claim 7, characterized in that: The MOFs material uses a composite adsorbent of lithium chloride loaded on a chromium-based metal-organic framework MIL-101(Cr), the PCM low-temperature thermal storage tank (15) uses sodium acetate trihydrate-glycerol eutectic hydrate as a phase change material, and the PCM high-temperature thermal storage tank (20) uses a modified paraffin-based composite material as a phase change material filler.

9. A refrigeration method based on the all-weather temperature control and dehumidification water collection system according to any one of claims 1-8, characterized in that, Including daytime cooling in plant factories: when the connection between the first three-way valve and the second three-way valve is open, the connection between the fifth three-way valve (19) and the PCM low-temperature heat storage tank (15) and the adsorption bed B (17) is open, the connection between the fourth three-way valve and the adsorption bed B (17) and the third three-way valve is open, and the connection between the third three-way valve and the fourth three-way valve and the PCM low-temperature heat storage tank (15) is open; The collector absorbs waste heat from the photovoltaic panel and solar radiation heat to heat the heat transfer oil in the collector. The first circulation pump (3) delivers the heated heat transfer oil along the main heat transfer oil pipeline to the first three-way valve (4). The heat transfer oil is divided into two branches at the first three-way valve (4) and delivered to the adsorption bed A (8) and MOFs tower (5) respectively. The heat transfer oil heats the silica gel-lithium chloride composite adsorbent and MOFs material through the spiral heat transfer oil coil. After heat exchange, the heat transfer oil is delivered to the common condenser (10) to absorb the condensation heat of water vapor. After the temperature rises, it enters the PCM high-temperature heat storage tank (20). The modified paraffin-based composite material in the tank is heated by the built-in spiral tube heat exchanger to melt it and store the heat in the form of latent heat. After heat exchange, the heat transfer oil is cooled at the outdoor temperature and returns to the collector to complete the cycle. After heating, the silica-lithium chloride composite adsorbent and MOFs material desorb dry water vapor. The water vapor enters the common condenser (10) through the pipeline, releases heat and condenses into liquid water. Part of it is filtered and transported by the second circulation pump to the fresh water tank (7) for water supply to the plant factory. The other part of the liquid water enters the evaporator (12) and evaporates into water vapor. At the same time, the sodium acetate trihydrate-glycerol eutectic hydrate phase change material that solidifies at night in the PCM low temperature heat storage tank (15) exchanges heat with the ethylene glycol aqueous solution flowing in the tube through the built-in submerged serpentine tube. After cooling, the ethylene glycol aqueous solution is transported by the third circulation pump (18) to the adsorption bed B (17) and exchanges heat with the silica-lithium chloride composite adsorbent through the built-in submerged serpentine tube. After being cooled, the silica-lithium chloride composite adsorbent continuously adsorbs the water vapor generated in the evaporator (11). The liquid water in the evaporator (11) continuously evaporates and absorbs heat to cool the plant factory.

10. The refrigeration method according to claim 9, characterized in that: It also includes nighttime cooling of the plant factory: when the connection between the first three-way valve and the second three-way valve is closed, the connection between the fifth three-way valve (19) and the PCM high-temperature heat storage tank (20) and the adsorption bed B (17) is open, the connection between the fourth three-way valve and the adsorption bed B (17) and the PCM high-temperature heat storage tank (20) is open, and the connection between the third three-way valve and the evaporator (12) and the PCM low-temperature heat storage tank (15) is open; The liquid paraffin-based composite material melted during the day in the PCM high-temperature heat storage tank (20) heats the heat transfer oil through the built-in spiral tube heat exchanger. The heated heat transfer oil is then transported by the third circulation pump (18) to the adsorption bed B (17) for heat exchange with the silica-lithium chloride composite adsorbent through the built-in submerged serpentine tube. After being heated, the silica-lithium chloride composite adsorbent desorbs dry water vapor. The water vapor enters the common condenser (10) through the pipeline, releases heat, and condenses into liquid water. The liquid water enters the evaporator (12) and evaporates into water vapor. At the same time, the adsorption bed A (8) is naturally affected by the outdoor environment at night. After cooling, the adsorbent continuously adsorbs the water vapor generated in the evaporator (12). The liquid water in the evaporator (12) continuously evaporates and absorbs heat to cool the plant factory. The ethylene glycol aqueous solution in the pipe connecting the evaporator (12) and the PCM low-temperature heat storage tank (15) absorbs excess cold in the evaporator (12) and is then transported to the PCM low-temperature heat storage tank (15) by the fourth circulation pump (23). It exchanges heat with the sodium acetate trihydrate-glycerol eutectic hydrate salt phase change material in the tank through the built-in submerged serpentine tube heat exchanger, so that the phase change material changes from liquid to solid and stores the cold in the form of latent heat.

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