Solar photovoltaic photo-thermal integrated system and method for phase-change material radiation air conditioner

Abstract

The invention belongs to the field of photo-thermal integration, and provides a phase-change material radiation air-conditioning solar photovoltaic photo-thermal integration system and a phase-change material radiation air-conditioning solar photovoltaic photo-thermal integration method. The phase-change material radiation air-conditioning solar photovoltaic photo-thermal integrated system comprises a double-layer phase-change material radiation plate, a solar photovoltaic photo-thermal integrated system and a radiation air-conditioning system, the double-layer phase change material radiant panel is connected with the radiation air conditioning system; daily supplied water firstly flows through the lower phase change material layer after entering the double-layer phase change material radiant panel, then flows through the upper phase change material layer and finally flows into the heat exchanger to be treated. When water is supplied at night, the bypass stop valve between the upper phase-change material layer and the lower phase-change material layer is closed, supplied water flows through the lower phase-change material layer and then directly flows into the heat exchanger to be treated, and return water treated by the heat exchanger returns to the absorption type refrigerating unit and serves as a cold and heat source to maintain stable operation of the radiation air conditioning system.

Description

Technical Field

[0001] The present invention belongs to the field of photothermal integration, and in particular relates to a phase change material radiation air conditioning solar photovoltaic photothermal integration system and method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] When conventional solar photovoltaic thermal systems are combined with air conditioning systems, the system composition is relatively complex, and multiple energy conversions reduce energy utilization. In addition, photovoltaic thermal equipment and air conditioning equipment occupy a large area and have low roof utilization. In addition, when the thermal system is complex, maintenance requirements also increase accordingly, requiring more inspections and more frequent maintenance to maintain system performance. Although conventional thermal systems can adjust the temperature of solar photovoltaic panels, it is difficult to keep the temperature of solar photovoltaic panels stable, affecting their power generation efficiency and lifespan. In addition, the thermal energy storage efficiency of traditional thermal systems is low, and additional equipment and space may be required. Summary of the invention

[0004] In order to solve the problems of complex structure, large floor space, low space utilization and low energy utilization of traditional systems in the above background technology, the present invention provides a phase change material radiation air conditioning solar photovoltaic thermal integration system and method.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The first aspect of the present invention provides a phase change material radiation air conditioning solar photovoltaic thermal integration system.

[0007] A phase change material radiation air conditioning solar photovoltaic thermal integration system, comprising: a double-layer phase change material radiation panel, a solar photovoltaic thermal integration system and a radiation air conditioning system;

[0008] The solar photovoltaic and thermal integrated system is used to provide electric energy for the radiation air conditioning system; the double-layer phase change material radiation plate includes an upper phase change material layer, a lower phase change material layer and a bypass stop valve therebetween; the radiation air conditioning system includes an absorption refrigeration unit and a heat exchanger;

[0009] The double-layer phase change material radiation plate is connected to the radiation air-conditioning system; during the day, after entering the double-layer phase change material radiation plate, the water supply first flows through the lower phase change material layer, then flows through the upper phase change material layer, and finally flows into the heat exchanger for treatment; during nighttime water supply, the bypass stop valve between the upper phase change material layer and the lower phase change material layer is closed, and the water supply flows through the lower phase change material layer and directly flows into the heat exchanger for treatment, and the return water after treatment by the heat exchanger returns to the absorption refrigeration unit to serve as a cold and heat source to maintain the stable operation of the radiation air-conditioning system.

[0010] As an implementation mode, the double-layer phase change material radiation panel also includes a heat collecting plate, a thermal insulation layer and a concrete structure layer; the heat collecting plate, the upper phase change material layer, the thermal insulation layer, the lower phase change material layer and the concrete structure layer are laid sequentially from top to bottom.

[0011] As an implementation mode, the upper phase change material layer and the lower phase change material layer are both paved with two layers of capillary networks, the two layers of capillary networks are connected to the refrigeration unit water supply, the two layers of capillary networks are connected by a connecting water pipe, and the bypass stop valve is arranged on the connecting water pipe.

[0012] As an implementation mode, the upper phase change material layer is made of a composite energy storage cement-based mortar with a high phase change temperature, and the phase change temperature thereof is 35-40°C.

[0013] As an implementation mode, the lower phase change material layer is made of composite energy storage cement-based mortar with a low phase change temperature, and its phase change temperature is 20-25°C.

[0014] As an implementation method, the solar photovoltaic and thermal integrated system includes solar photovoltaic panels, inverters, energy storage batteries and transformers; the solar photovoltaic panels generate direct current, which is processed by the inverter and provides electrical energy to the radiation air-conditioning system, and the excess electrical energy is stored in the energy storage battery or transmitted to the power grid after being boosted by the transformer.

[0015] As an implementation mode, the absorption refrigeration unit is a waste heat type lithium bromide absorption refrigeration unit; and the heat exchanger is a plate-fin heat exchanger.

[0016] The second aspect of the present invention provides a working method of the phase change material radiation air conditioning solar photovoltaic thermal integration system as described above.

[0017] A working method of the phase change material radiation air conditioning solar photovoltaic thermal integration system as described above, comprising:

[0018] During the day, the solar photovoltaic panels generate direct current, which is processed by the inverter and then supplied to the absorption refrigeration unit. The excess power is stored in the energy storage battery or transmitted to the power grid after being stepped up by the transformer. When the sunshine is insufficient, the power stored in the energy storage battery or directly supplied by the power grid is used to ensure the stable operation of the absorption refrigeration unit.

[0019] After entering the double-layer phase change material radiation plate, the daytime water first flows through the lower phase change material layer, then flows through the upper phase change material layer, and finally flows into the heat exchanger for treatment;

[0020] When supplying water at night, the bypass stop valve between the upper phase change material layer and the lower phase change material layer is closed, and the supply water flows through the lower phase change material layer and directly flows into the heat exchanger for treatment. The return water after treatment by the heat exchanger returns to the absorption refrigeration unit and serves as a cold and heat source to maintain the stable operation of the radiation air-conditioning system.

[0021] As an implementation method, in summer working conditions: during the day, the solar photovoltaic panel continuously generates electricity to supply the absorption refrigeration unit, and the temperature of the solar photovoltaic panel rises; the upper phase change material layer absorbs the solar photovoltaic panel and the remaining solar radiation heat, and at the same time the absorption refrigeration unit continues to work, supplying cold water to the double-layer phase change material radiation plate, and the cold water first flows through the lower phase change material layer to radiate coldness, and then flows through the upper phase change material layer; the cold water absorbs the heat in the double-layer phase change material radiation plate and then flows into the heat exchanger; the temperature of the return water rises again after being processed by the heat exchanger, and flows into the absorption refrigeration unit as a heat source;

[0022] At night, the solar photovoltaic panels stop working and use the stored electricity in the energy storage battery or the power grid to directly supply electricity; the absorption refrigeration unit continues to work, supplying cold water to the double-layer phase change material radiation plate, the bypass stop valve is closed, and the cold water only flows through the lower phase change material layer; the cold water absorbs the heat in the double-layer phase change material radiation plate and flows into the heat exchanger; the return water is processed by the heat exchanger and the temperature rises again, and flows into the generator of the absorption refrigeration unit as a heat source.

[0023] As an implementation method, in winter conditions:

[0024] During the day, the solar photovoltaic panels continuously generate electricity to supply the absorption refrigeration unit, and the temperature of the solar photovoltaic panels rises; the upper phase change material layer absorbs the solar photovoltaic panels and the remaining solar radiation heat; when the temperature of the solar photovoltaic panels is lower than the preset temperature, the upper phase change material layer radiates heat to the solar photovoltaic panels; the absorption refrigeration unit continues to work, supplying hot water to the double-layer phase change material radiation plate, and the hot water first flows through the lower phase change material layer, and then flows through the upper phase change material layer; the hot water absorbs the cold in the double-layer phase change material radiation plate, and flows into the heat exchanger after the temperature drops; the return water is processed by the heat exchanger, and the temperature drops again, and flows into the evaporator of the absorption refrigeration unit as a cold source;

[0025] At night, the solar photovoltaic panels stop working and use the stored electricity in the energy storage battery or the power grid to supply electricity directly; the absorption refrigeration unit continues to work, supplying hot water to the double-layer phase change material radiation plate, the bypass stop valve is closed, and the hot water only flows through the lower phase change material layer; the hot water absorbs the heat in the double-layer phase change material radiation plate, and flows into the heat exchanger after the temperature drops; the return water is processed by the heat exchanger and the temperature drops again, and flows into the evaporator of the absorption refrigeration unit as a cold source.

[0026] The beneficial effects of the present invention are:

[0027] The present invention proposes an integrated system that combines a solar photovoltaic thermal system with a phase change material radiation panel air conditioning. The system adopts a phase change radiation panel composed of a composite energy storage cement-based mortar with two different phase change temperatures, and simultaneously realizes space radiation temperature control and solar photovoltaic panel temperature control. The integrated system solves the problems of complex structure, large footprint, low space utilization and low energy utilization of traditional systems.

[0028] The present invention uses a double-layer phase change material radiation plate structure to reduce temperature fluctuations of solar photovoltaic panels, improve the thermal energy storage efficiency of the photothermal system, and improve the temperature uniformity of the radiation space.

[0029] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0031] Figure 1 Schematic diagram of the structure of the phase change material radiation air conditioning solar photovoltaic thermal integration system according to an embodiment of the present invention;

[0032] Figure 2 Schematic diagram of the structure of a double-layer phase change material radiation plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] according to Figure 1 , a phase change material radiation air conditioning solar photovoltaic thermal integration system according to an embodiment of the present invention comprises: a double-layer phase change material radiation plate 1, a solar photovoltaic thermal integration system and a radiation air conditioning system;

[0037] The solar photovoltaic and thermal integrated system is used to provide electric energy for the radiation air conditioning system; the double-layer phase change material radiation plate 1 includes an upper phase change material layer 102, a lower phase change material layer 104 and a bypass stop valve 108 therebetween; the radiation air conditioning system includes an absorption refrigeration unit and a heat exchanger;

[0038] The double-layer phase change material radiation plate is connected to the radiation air-conditioning system; during the day, after entering the double-layer phase change material radiation plate, the water supply first flows through the lower phase change material layer, then flows through the upper phase change material layer, and finally flows into the heat exchanger for treatment; during nighttime water supply, the bypass stop valve between the upper phase change material layer and the lower phase change material layer is closed, and the water supply flows through the lower phase change material layer and directly flows into the heat exchanger for treatment, and the return water after treatment by the heat exchanger returns to the absorption refrigeration unit to serve as a cold and heat source to maintain the stable operation of the radiation air-conditioning system.

[0039] The phase change material radiation air conditioning solar photovoltaic thermal integration system of the embodiment of the present invention comprises a double-layer phase change material radiation plate 1 as the photothermal part of the solar photovoltaic thermal system and as the radiation cold plate of the radiation air conditioning system.

[0040] In the specific implementation process, Figure 2 As shown, the double-layer phase change material radiation plate also includes a heat collecting plate 101, a thermal insulation layer 103 and a concrete structure layer 105; the heat collecting plate 101, the upper phase change material layer 102, the thermal insulation layer 103, the lower phase change material layer 104, and the concrete structure layer 105 are laid sequentially from top to bottom.

[0041] In this embodiment, the upper phase change material layer and the lower phase change material layer are both paved with two layers of capillary networks (for example, the first capillary network 106 and the second capillary network 107), the two layers of capillary networks are connected to the refrigeration unit water supply, the two layers of capillary networks are connected by a connecting water pipe, and the bypass stop valve is arranged on the connecting water pipe.

[0042] The first capillary network 106 and the second capillary network 107 are composed of capillaries made of copper, aluminum or stainless steel.

[0043] Preferably, the heat collecting plate 101 is a heat collecting plate made of oxygen-free copper, and the surface is covered with a black chrome coating.

[0044] The upper phase change material layer is made of composite energy storage cement-based mortar with a high phase change temperature, and its phase change temperature is 35-40° C. The lower phase change material layer is made of composite energy storage cement-based mortar with a low phase change temperature, and its phase change temperature is 20-25° C.

[0045] In some optional embodiments, paraffin wax with a phase change temperature of 20-25°C is produced by a direct impregnation method; paraffin wax with a phase change temperature of 35-40°C is produced by a direct impregnation method.

[0046] Among them, the production process of composite energy storage cement-based mortar is as follows: first, liquid paraffin with low phase change temperature is evenly mixed with coal gasification slag powder by direct impregnation method to form coal gasification slag (CGS) / paraffin shape-stable phase change material, and then CGS-P, silicate cement, sand and water are added in proportion, an appropriate amount of water reducer is added, and mixed in a mixer, and finally intermittent stirring is performed to make composite energy storage cement-based mortar with low phase change temperature.

[0047] Preferably, the insulation layer 103 is made of glass wool, polystyrene foam or phenolic foam.

[0048] In this embodiment, the solar photovoltaic and thermal integrated system includes a solar photovoltaic panel 6, an inverter 2, an energy storage battery 3 and a transformer 10; the solar photovoltaic panel 6 generates direct current, which is processed by the inverter 2 and then provided to the radiation air conditioning system. Excess electric energy is stored in the energy storage battery or is transmitted to the power grid after being stepped up by the transformer.

[0049] In this embodiment, the absorption refrigeration unit is a waste heat type lithium bromide absorption refrigeration unit; and the heat exchanger is a plate-fin heat exchanger.

[0050] It should be noted here that, in other embodiments, the structures of the absorption refrigeration unit and the heat exchanger can be implemented by other existing structures, which will not be described in detail here.

[0051] Based on Figure 1 The working method of the phase change material radiation air conditioning solar photovoltaic light-thermal integrated system comprises:

[0052] The solar photovoltaic panel 6 generates direct current during the day, which is processed by the inverter 2 and then supplied to the absorption refrigeration unit 5. The excess power is stored in the energy storage battery 3, or is boosted by the transformer 10 and then transmitted to the power grid. The amount of power transmitted is recorded by the first electric meter 8. When the sunshine is insufficient, the power stored in the energy storage battery 3 or the power grid is used to directly supply power to ensure the stable operation of the absorption refrigeration unit 5. The amount of power purchased is recorded by the second electric meter 9.

[0053] After entering the double-layer phase change material radiation plate 1, the daytime water first flows through the lower phase change material layer 104, then flows through the upper phase change material layer 102, and finally flows into the heat exchanger 7 for treatment;

[0054] When supplying water at night, the bypass stop valve 108 between the upper phase change material layer 102 and the lower phase change material layer 104 is closed, and the supply water flows through the lower phase change material layer 104 and directly flows into the heat exchanger 7 for treatment. The return water after treatment by the heat exchanger 7 returns to the absorption refrigeration unit 5 and serves as a cold and heat source to maintain the stable operation of the radiation air-conditioning system.

[0055] Under daytime conditions, the energy provided to the radiation plate by the absorption refrigeration unit through the first capillary network 106 and the second capillary network 107 includes the cold / heat transferred to the double-layer phase change material radiation plate 1 by the solar photovoltaic panel 6 and the cold / heat provided to the radiation space by the double-layer phase change material radiation plate 1. Under nighttime conditions, the energy provided to the radiation plate by the absorption refrigeration unit through the first capillary network 106 and the second capillary network 107 is only the cold / heat provided to the radiation space by the double-layer phase change material radiation plate 1.

[0056] The amount of cold / heat transferred from the solar photovoltaic panel 6 to the double-layer phase change material radiation panel 1 is specifically calculated by the following formula:

[0057] Q abs =η×I×A p ×cos(θ)

[0058] Q loss =f(I,T,A p ,V)

[0059] Q 1 =Q abs -Q loss

[0060] Among them, Q abs represents the solar radiation energy absorbed by the photovoltaic panel (J); η represents the thermal efficiency of the photovoltaic panel (%); I represents the solar radiation intensity (W / m 2 );A p Represents the photovoltaic panel area (m 2 );θ represents the solar altitude angle (°); Q loss represents the heat dissipation loss of the photovoltaic panel itself (J); f represents the heat dissipation loss function, which depends on factors such as photovoltaic panel material, surface characteristics, ambient temperature, wind speed, etc.; T represents ambient temperature (k); V represents the wind speed on the photovoltaic panel surface (m / s); Q 1 Represents the amount of cold / heat (J) transferred from the solar photovoltaic panel 6 to the double-layer phase change material radiation panel 1.

[0061] The cooling / heating amount provided by the double-layer phase change material radiation panel 1 to the radiation space is calculated by the following formula:

[0062] Q 2 =h t ×A×(T 1 -T 2)

[0063] h t =h c +h r

[0064] hr=ε×σ×(T 1 2 +T 2 2 )×(T 1 +T 2 )

[0065] Among them, Q 2 represents the amount of cold / heat (J) provided by the double-layer phase change material radiation panel (1) to the radiation space; h t The heat transfer coefficient (W / (m 2 ·k)); A p Represents the area of ​​the double-layer phase change material radiation plate (1) (m 2 );T 1 represents the surface temperature (k) of the double-layer phase change material radiation plate (1); T 2 represents the air temperature of the radiation space (K); h c represents the convection heat transfer coefficient (W / (m 2 ·k));h r The heat transfer coefficient (W / (m 2 ·k)); ε represents the surface emissivity of the double-layer phase change material radiation plate (1); σ represents the black body radiation constant, which is 5.67×10 -8 W / (m 2 ·K 4 ).

[0066] In summer conditions, the solar photovoltaic panel 6 continuously generates electricity to supply the absorption refrigeration unit 5 during the day, and the temperature of the solar photovoltaic panel 6 rises. The upper phase change material layer 102 in the double-layer phase change material radiation plate 1 absorbs the solar photovoltaic panel 6 and the remaining solar radiation heat, and melts after phase change, thereby reducing the temperature of the solar photovoltaic panel 6 and improving its power generation efficiency. At the same time, the absorption refrigeration unit continues to work, supplying 15°C cold water to the double-layer phase change material radiation plate 1. The cold water first flows through the lower phase change material layer 104 to reduce its temperature, radiates coldness, adjusts the temperature of the radiation space, and then flows through the upper phase change material layer 102. The cold water absorbs the heat in the double-layer phase change material radiation plate 1, and flows into the heat exchanger 7 after the temperature rises. After being processed by the heat exchanger 7, the temperature of the return water rises to 80°C, and flows into the generator of the absorption refrigeration unit as a heat source. At night, the solar photovoltaic panel 6 stops working, and the stored electricity in the energy storage battery 3 or the power grid can be used to directly supply power to ensure the stable operation of the absorption refrigeration unit 5. The absorption refrigeration unit continues to work, supplying 15°C cold water to the double-layer phase change material radiation plate 1. The bypass stop valve 108 on the connecting water pipe is closed, and the cold water only flows through the lower phase change material layer 104, lowering its temperature, radiating cold energy, and adjusting the temperature of the radiation space. The composite energy storage cement-based mortar with a phase change temperature of 35°C in the upper phase change material layer 102 gradually cools and solidifies under the nighttime ambient temperature, completing the phase change cycle. The cold water absorbs the heat in the double-layer phase change material radiation plate 1, and flows into the heat exchanger 7 after the temperature rises. After being processed by the heat exchanger 7, the temperature of the return water rises to 80°C, and flows into the generator of the absorption refrigeration unit as a heat source.

[0067] Under winter working conditions, the solar photovoltaic panel 6 continuously generates electricity to supply the absorption refrigeration unit 5 during the day, and the temperature of the solar photovoltaic panel 6 rises. The upper phase change material layer 102 in the double-layer phase change material radiation plate 1 absorbs the solar photovoltaic panel 6 and the remaining solar radiation heat, and melts after phase change, thereby reducing the temperature of the solar photovoltaic panel 6 and improving its power generation efficiency. In extremely low temperature weather, the temperature of the solar photovoltaic panel 6 is too low, and the upper phase change material layer 102 in the double-layer phase change material radiation plate 1 will radiate heat to the solar photovoltaic panel 6, increase the temperature of the solar photovoltaic panel 6, and improve its power generation efficiency. At the same time, the absorption refrigeration unit continues to work, supplying 45°C hot water to the double-layer phase change material radiation plate 1. The hot water first flows through the lower phase change material layer 104 to increase its temperature, and radiates heat to adjust the temperature of the radiation space, and then flows through the upper phase change material layer 102. The hot water absorbs the cold in the double-layer phase change material radiation plate 1, and flows into the heat exchanger 7 after the temperature drops. After the return water is processed by the heat exchanger 7, the temperature drops to 10°C, and flows into the evaporator of the absorption refrigeration unit as a cold source. At night, the solar photovoltaic panel 6 stops working, and the power stored in the energy storage battery 3 or the power grid can be used to directly supply power to ensure the stable operation of the absorption refrigeration unit 5. The absorption refrigeration unit continues to work, supplying 45°C hot water to the double-layer phase change material radiation plate 1, and the bypass stop valve 108 on the connecting water pipe is closed. The hot water only flows through the lower phase change material layer 104, causing its temperature to rise and radiate heat to adjust the temperature of the radiation space. The hot water absorbs the heat in the double-layer phase change material radiation plate 1, and flows into the heat exchanger 7 after the temperature drops. After being processed by the heat exchanger 7, the temperature of the return water drops to 10°C, and flows into the evaporator of the absorption refrigeration unit as a cold source.

[0068] The system structure of the present invention is simple. The double-layer phase change material radiation plate using phase change material can realize space radiation temperature control and solar photovoltaic panel temperature control at the same time, and couple the photovoltaic thermal system and the radiation air-conditioning system. Compared with the simple combination of the traditional photovoltaic thermal system and the radiation air-conditioning system, the structure is simpler, the number of energy conversions is reduced, the energy utilization rate is increased, and the floor space is reduced. At the same time, the use of phase change materials can significantly reduce the temperature fluctuation of solar photovoltaic panels, improve the thermal energy storage efficiency of the thermal system, and improve the temperature uniformity of the radiation space. The combination of double-layer phase change material radiation plates, heat exchangers, and absorption refrigeration units can make full use of the waste cold and waste heat generated by the photovoltaic thermal system and the radiation air-conditioning system. The waste cold and waste heat can be used as the cold and heat sources of the absorption refrigeration unit after being processed by the heat exchanger, further improving the energy utilization rate.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A phase change material radiation air conditioning solar photovoltaic thermal integration system, characterized in that: include: Double-layer phase change material radiation panels, solar photovoltaic and thermal integrated systems, and radiation air conditioning systems; The solar photovoltaic and thermal integrated system is used to provide electrical energy for the radiation air conditioning system; The double-layer phase change material radiation plate includes an upper phase change material layer, a lower phase change material layer and a bypass stop valve therebetween; the radiation air conditioning system includes an absorption refrigeration unit and a heat exchanger; The double-layer phase change material radiation plate is connected to the radiation air-conditioning system; during the day, after entering the double-layer phase change material radiation plate, the water supply first flows through the lower phase change material layer, then flows through the upper phase change material layer, and finally flows into the heat exchanger for treatment; during nighttime water supply, the bypass stop valve between the upper phase change material layer and the lower phase change material layer is closed, and the water supply flows through the lower phase change material layer and directly flows into the heat exchanger for treatment, and the return water after treatment by the heat exchanger returns to the absorption refrigeration unit to serve as a cold and heat source to maintain the stable operation of the radiation air-conditioning system.

2. The phase change material radiation air conditioning solar photovoltaic thermal integration system according to claim 1, characterized in that: The double-layer phase change material radiation plate also includes a heat collecting plate, a thermal insulation layer and a concrete structure layer; the heat collecting plate, the upper phase change material layer, the thermal insulation layer, the lower phase change material layer and the concrete structure layer are laid sequentially from top to bottom.

3. The phase change material radiation air conditioning solar photovoltaic thermal integration system according to claim 1, characterized in that: The upper phase change material layer and the lower phase change material layer are both paved with two layers of capillary networks, the two layers of capillary networks are connected to the refrigeration unit water supply, the two layers of capillary networks are connected through a connecting water pipe, and the bypass stop valve is arranged on the connecting water pipe.

4. The phase change material radiation air conditioning solar photovoltaic thermal integration system according to claim 1, characterized in that: The upper phase change material layer is made of composite energy storage cement-based mortar with a high phase change temperature, and its phase change temperature is 35-40°C.

5. The phase change material radiation air conditioning solar photovoltaic thermal integration system according to claim 1, characterized in that: The lower phase change material layer is made of composite energy storage cement-based mortar with a low phase change temperature, and its phase change temperature is 20-25°C.

6. The phase change material radiation air conditioning solar photovoltaic thermal integration system according to claim 1, characterized in that: The solar photovoltaic and thermal integrated system includes solar photovoltaic panels, inverters, energy storage batteries and transformers; the solar photovoltaic panels generate direct current, which is processed by the inverter and provides electrical energy to the radiation air conditioning system, and the excess electrical energy is stored in the energy storage battery or transmitted to the power grid after being boosted by the transformer.

7. The phase change material radiation air conditioning solar photovoltaic thermal integration system according to claim 1, characterized in that: The absorption refrigeration unit is a waste heat type lithium bromide absorption refrigeration unit; the heat exchanger is a plate-fin heat exchanger.

8. A working method of a phase change material radiation air conditioning solar photovoltaic thermal integration system based on any one of claims 1 to 7, characterized in that: include: During the day, the solar photovoltaic panels generate direct current, which is processed by the inverter and then supplied to the absorption refrigeration unit. The excess power is stored in the energy storage battery or transmitted to the power grid after being stepped up by the transformer. When the sunshine is insufficient, the power stored in the energy storage battery or directly supplied by the power grid is used to ensure the stable operation of the absorption refrigeration unit. After entering the double-layer phase change material radiation plate, the daytime water first flows through the lower phase change material layer, then flows through the upper phase change material layer, and finally flows into the heat exchanger for treatment; When supplying water at night, the bypass stop valve between the upper phase change material layer and the lower phase change material layer is closed, and the supply water flows through the lower phase change material layer and directly flows into the heat exchanger for treatment. The return water after treatment by the heat exchanger returns to the absorption refrigeration unit and serves as a cold and heat source to maintain the stable operation of the radiation air-conditioning system.

9. The working method of the phase change material radiation air conditioning solar photovoltaic thermal integration system according to claim 8, characterized in that: In summer working conditions: during the day, the solar photovoltaic panels continuously generate electricity to supply the absorption refrigeration unit, and the temperature of the solar photovoltaic panels rises; the upper phase change material layer absorbs the solar photovoltaic panels and the remaining solar radiation heat, and the absorption refrigeration unit continues to work, supplying cold water to the double-layer phase change material radiation plate, and the cold water first flows through the lower phase change material layer to radiate cold energy, and then flows through the upper phase change material layer; the cold water absorbs the heat in the double-layer phase change material radiation plate and then flows into the heat exchanger; the temperature of the return water rises again after being processed by the heat exchanger, and flows into the absorption refrigeration unit as a heat source; At night, the solar photovoltaic panels stop working and use the stored electricity in the energy storage battery or the power grid to directly supply electricity; the absorption refrigeration unit continues to work, supplying cold water to the double-layer phase change material radiation plate, the bypass stop valve is closed, and the cold water only flows through the lower phase change material layer; the cold water absorbs the heat in the double-layer phase change material radiation plate and flows into the heat exchanger; the return water is processed by the heat exchanger and the temperature rises again, and flows into the generator of the absorption refrigeration unit as a heat source.

10. The working method of the phase change material radiation air conditioning solar photovoltaic thermal integration system according to claim 8, characterized in that: In winter conditions: During the day, the solar photovoltaic panels continuously generate electricity to supply the absorption refrigeration unit, and the temperature of the solar photovoltaic panels rises; the upper phase change material layer absorbs the solar photovoltaic panels and the remaining solar radiation heat; when the temperature of the solar photovoltaic panels is lower than the preset temperature, the upper phase change material layer radiates heat to the solar photovoltaic panels; the absorption refrigeration unit continues to work, supplying hot water to the double-layer phase change material radiation plate, and the hot water first flows through the lower phase change material layer, and then flows through the upper phase change material layer; the hot water absorbs the cold in the double-layer phase change material radiation plate, and flows into the heat exchanger after the temperature drops; the return water is processed by the heat exchanger, and the temperature drops again, and flows into the evaporator of the absorption refrigeration unit as a cold source; At night, the solar photovoltaic panels stop working and use the stored electricity in the energy storage battery or the power grid to supply electricity directly; the absorption refrigeration unit continues to work, supplying hot water to the double-layer phase change material radiation plate, the bypass stop valve is closed, and the hot water only flows through the lower phase change material layer; the hot water absorbs the heat in the double-layer phase change material radiation plate, and flows into the heat exchanger after the temperature drops; the return water is processed by the heat exchanger and the temperature drops again, and flows into the evaporator of the absorption refrigeration unit as a cold source.

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