A heating device combining a transcritical carbon dioxide heat pump and a solar PVT module

Abstract

The utility model discloses a heating device of a transcritical carbon dioxide heat pump coupled with a solar PVT component, which is used to solve the problem that the existing photovoltaic thermal system and device have low utilization rate of solar energy and generate a large amount of photovoltaic waste heat when in use. The heating device disclosed in the utility model includes a PVT heat collection evaporator, a fin evaporator, a photovoltaic power generation control module, and a heat pump circulation module; the waste heat stored in the component is taken away by the flow of the heat pump working fluid, and after being upgraded by the heat pump circulation module, the heat is released at the condensation end for user use. After the supercooled working fluid in the condensation process is throttled by the expansion valve to reduce temperature and pressure, it becomes a two-phase state and then flows into the PVT heat collection evaporator and the fin evaporator to complete a complete thermodynamic cycle. The PVT heat collection evaporator and the fin evaporator are connected in parallel, thereby constructing a system cycle of dual evaporation heat sources of the PVT heat collection evaporator and the fin evaporator, further improving the utilization efficiency of solar energy and effectively reducing the generation of photovoltaic waste heat.

Description

Technical Field

[0001] The utility model relates to the fields of solar photovoltaic thermal technology and transcritical carbon dioxide heat pumps, and in particular to a heating device of a transcritical carbon dioxide heat pump coupled with a solar PVT component. Background Art

[0002] Solar energy has the characteristics of wide distribution, easy access, large energy reserves, clean and pollution-free. It has gradually become an important substitute for fossil energy. The comprehensive utilization of solar energy is one of the effective ways to solve energy problems and environmental pollution problems. As a low-grade and highly dispersed renewable energy, photovoltaic systems can directly convert light energy into electrical energy, which is a common way to utilize solar energy on the market. However, traditional crystalline silicon photovoltaic modules still face certain bottlenecks in conversion efficiency. Even under the best conditions, their conversion efficiency is difficult to break through the 30% limit. This makes a large amount of solar energy unable to be effectively utilized, and inevitably converted into waste heat, which in turn causes the operating temperature of photovoltaic panels to be significantly higher than the ambient temperature, reducing the power generation efficiency. Excessive temperature not only affects the power generation efficiency of photovoltaic panels, but also threatens their service life.

[0003] In response to this situation, a new type of PVT panel (integration of photovoltaic (PV) and photothermal (PT)) has emerged. This PVT panel adds heat exchange microchannels on the basis of photovoltaic modules and is organically combined with photovoltaic modules. The heat on the surface of the photovoltaic module is converted into usable heat by circulating the medium in the heat exchange microchannel. At the same time, the temperature of the surface of the photovoltaic module can be effectively reduced, thereby improving the electrical conversion rate of the photovoltaic module. If the PVT photovoltaic module can be applied to the heat pump heating system, a lot of energy can be saved. There are also heat pump heating systems using photovoltaic heat in the prior art; for example, the Chinese patent with authorization announcement number CN218583267 discloses a PVT heat pump heat storage heating system, including a compressor, a condensing heat exchanger, a heating water tank, a throttling device, a PVT module, a hot water storage tank group and a photovoltaic control system; the compressor, the condensing heat exchanger, the throttling device and the PVT module are connected in sequence to form a circulating heating system to heat the tap water in the heating water tank. The system actually uses photovoltaic power generation technology and PVT heat pump technology to provide heating for users. However, the system only has one heat source, the PVT group, and its reliability cannot be guaranteed. It also does not take into account the situation of no solar radiation. The PVT group does not solve the problem of photovoltaic waste heat when in use, resulting in the low utilization rate of solar energy by the device provided by the patent. In addition, a large amount of photovoltaic waste heat will produce a high-temperature environment. When photovoltaic panels are working under high temperatures, hot spots will occur. In severe cases, it may even cause the photovoltaic components to catch fire, posing a major hidden danger to operational safety. How to further improve the utilization efficiency of solar energy and effectively reduce the generation of photovoltaic waste heat has become a key issue that needs to be urgently solved in this field.

[0004] Therefore, there is a need for a photovoltaic heating system device that can further improve the utilization efficiency of solar energy and effectively reduce the generation of photovoltaic waste heat. Utility Model Content

[0005] In order to solve the problems raised in the above background technology, the utility model provides a heating device of a transcritical carbon dioxide heat pump coupled with a solar PVT component, which solves the problem that the current photovoltaic thermal system has low solar energy utilization efficiency and generates a large amount of waste heat during use.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heating device of a transcritical carbon dioxide heat pump coupled with a solar PVT component, characterized in that: the heating device of the transcritical carbon dioxide heat pump coupled with a solar PVT component comprises a PVT heat collecting evaporator and a heat pump circulation module; a fin evaporator is arranged in the heat pump circulation module, the heat pump working fluid output end of the PVT heat collecting evaporator is connected to the heat pump working fluid input end of the heat pump circulation module through a pipeline, and the heat pump working fluid output end of the heat pump circulation module is connected to the heat pump working fluid input end of the PVT heat collecting evaporator through a pipeline; the fin evaporator in the heat pump circulation module is connected in parallel with the PVT heat collecting evaporator through a pipeline, and a switching mechanism for controlling the flow direction of the heat pump working fluid output by the heat pump circulation module is arranged on the pipeline;

[0007] The heat pump circulation module is also provided with a condensation end for condensation and heat dissipation, wherein the heat generated by heat exchange at the condensation end is used to heat the equipment to be heated;

[0008] The working medium of the heat pump is carbon dioxide.

[0009] The heating device based on the above transcritical carbon dioxide heat pump coupled with solar PVT components further includes a photovoltaic power generation control module, which is electrically connected to the PVT heat collection evaporator, heat pump circulation module and switching mechanism.

[0010] Based on the above-mentioned transcritical carbon dioxide heat pump coupled with a solar PVT component heating device, further, the photovoltaic power generation control module includes a photovoltaic inverter and a battery; the current input end of the photovoltaic inverter is connected to the current output end of the PVT heat collection evaporator through a wire, and the current output end of the photovoltaic inverter is connected to the current input end of the heat pump circulation module through a wire; the battery is electrically connected to the power supply end of the photovoltaic inverter.

[0011] Based on the above-mentioned transcritical carbon dioxide heat pump coupled with solar PVT component heating device, further, the current output end of the photovoltaic inverter is connected to the power grid; the current output end of the power grid is connected to the current input end of the heat pump circulation module through a wire.

[0012] Based on the above-mentioned transcritical carbon dioxide heat pump coupled with a solar PVT component heating device, further, the switching mechanism is a first solenoid valve assembly and a first solenoid valve assembly, wherein the first solenoid valve assembly is arranged on the pipeline where the PVT collector evaporator is located, and the first solenoid valve assembly is arranged on the pipeline where the fin evaporator is located.

[0013] The switching mechanism enables the heat pump circulation module to have two working modes:

[0014] (1) When there is solar radiation, the second solenoid valve assembly connected to the finned evaporator is closed, and the heat pump working fluid runs through the PVT heat collection evaporator to complete the heating;

[0015] (2) When there is no solar radiation, the first solenoid valve assembly connected to the PVT heat collector evaporator is closed, and the second solenoid valve assembly connected to the fin evaporator is opened, and the heat pump working fluid runs through the fin evaporator to complete the heating.

[0016] Based on the above-mentioned transcritical carbon dioxide heat pump coupled with a solar PVT component heating device, further, the heat pump circulation module includes a compressor, a condenser, an expansion valve and a fin evaporator; the heat pump working fluid output end of the PVT heat collecting evaporator and the fin evaporator is connected to the heat pump working fluid input end of the compressor through a pipeline, the heat pump working fluid output end of the compressor is connected to the heat pump working fluid input end of the condenser through a pipeline, the heat pump working fluid output end of the condenser is connected to the heat pump working fluid input end of the expansion valve through a pipeline, and is connected to the heat pump working fluid input end of the PVT heat collecting evaporator and the fin evaporator after the expansion valve; wherein, the condenser is the condensing end of the heat pump circulation module.

[0017] Based on the above-mentioned transcritical carbon dioxide heat pump coupled with solar PVT component heating device, further, a heat collecting tank is arranged in the condenser; the water outlet of the heat collecting tank is connected to the heating water supply pipe, and the water inlet of the heat collecting tank is connected to the heating return pipe.

[0018] Based on the above-mentioned heating device of the transcritical carbon dioxide heat pump coupled with the solar PVT component, further, a first control valve is provided on the heating water supply pipe connected to the water outlet of the heat collecting tank, and a second control valve is provided on the heating return pipe connected to the water inlet of the heat collecting tank.

[0019] Based on the above-mentioned transcritical carbon dioxide heat pump coupled with a solar PVT component heating device, further, the PVT heat collection evaporator includes a plurality of solar PVT components, the solar PVT components include a glass cover layer, an EVA film, a photovoltaic cell sheet, an EVA film and an aluminum-based back plate placed in sequence from top to bottom, and the aluminum-based back plate includes a heat exchange fluid channel;

[0020] The photovoltaic cell of the solar PVT assembly is connected to the photovoltaic power generation control module through a wire, and the heat exchange fluid channel of the solar PVT assembly is connected to the heat pump circulation module through a pipeline;

[0021] The glass cover layer on the solar PVT assembly comprises an upper surface for radiative heat dissipation, and the lower surface of the aluminum-based back plate is coated with a black coating for absorbing radiation.

[0022] Based on the above-mentioned heating device of the transcritical carbon dioxide heat pump coupled with the solar PVT component, further, a heating chamber is provided in the fin evaporator.

[0023] Beneficial effects:

[0024] (1) The heating device disclosed in the present invention, on the one hand, removes the useless heat generated by the solar PVT module during operation through the flow of heat pump working fluid, thereby achieving the purpose of reducing photovoltaic waste heat, effectively reducing the temperature of the surface of the solar PVT module, and improving the electrical conversion rate of the solar PVT module. The solar PVT module generates electrical energy and the output is regulated by the photovoltaic power generation control module to drive the load in the heat pump circulation module. On the other hand, the heat pump working fluid circulating in the pipeline converts the heat absorbed from the surface of the solar PVT module into usable heat through the heat pump circulation module, further improving the utilization efficiency of solar energy and effectively reducing the generation of photovoltaic waste heat.

[0025] (2) The heating device disclosed in the utility model adopts carbon dioxide as a heat pump working fluid for latent heat exchange. Carbon dioxide as a heat pump working fluid has an ODP (ozone depletion potential) of 0 and a GWP (global warming potential) of 1. Its critical point is 31.3°C and 7.38MPa. The compressor suction specific volume is small and the volumetric heating capacity is large. The critical temperature is low. The heat release process of carbon dioxide as a heat pump working fluid is not condensed in the two-phase region, but heat is released in an area close to or exceeding the critical point. The heat release process is a variable temperature process with a large temperature glide, which just matches the required variable temperature heat source. It is a special Lorentz cycle with a high heating COP (energy efficiency conversion ratio) coefficient.

[0026] (3) In the heating device disclosed by the present invention, the solar PVT component and the heat pump circulation module are coupled to each other, and the PVT heat collection evaporator and the fin evaporator provide heat as a whole, so that in an outdoor low-temperature environment, the device can provide hot water to users regardless of the presence or absence of solar radiation.

[0027] (4) The two working modes of the heat pump circulation module of the heating device disclosed by the utility model enable the heating device disclosed by the utility model to operate normally regardless of whether there is solar radiation or not, and can heat the water tank day and night, so that the user can change the hot water at any time.

[0028] (5) In the heating device disclosed by the utility model, the photovoltaic inverter is connected to the power grid, and the power grid is connected to the compressor and the fin evaporator. When the power generation of the solar PVT component is insufficient, the compressor and the fin evaporator can obtain electrical energy from the power grid to drive the heat pump circulation module to generate heat, thereby preventing the heating device from stopping working due to insufficient power. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of a heating device of a transcritical carbon dioxide heat pump coupled with a solar PVT component in an embodiment of the utility model;

[0030] Figure 2 This is a schematic diagram of the structure of a solar PVT assembly in an embodiment of the utility model;

[0031] Figure 3 It is a schematic diagram of the structure of the condenser in the embodiment of the utility model.

[0032] In the figure: 1. PVT heat collection evaporator; 2. Fin evaporator; 3. Photovoltaic inverter; 4. Battery; 5. Compressor; 6. Condenser; 7. Expansion valve; 8. First solenoid valve assembly; 9. First solenoid valve assembly; 10. Heating water supply pipe; 11. Heating return pipe; 12. First control valve; 13. Second control valve; 14. Solar PVT assembly; 15. Heat collection tank; 16. Glass cover layer; 17. Photovoltaic cell; 18. EVA film; 19. Aluminum backplane. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0034] Embodiment 1:

[0035] like Figure 1, 2, 3, the present embodiment provides a transcritical carbon dioxide heat pump coupled with a solar PVT component heating device, wherein the transcritical carbon dioxide heat pump coupled with a solar PVT component heating device includes a PVT heat collecting evaporator 1, a photovoltaic power generation control module and a heat pump circulation module; the PVT heat collecting evaporator 1, the heat pump circulation module and the photovoltaic power generation control module are connected by wires; the PVT heat collecting evaporator 1 and the heat pump circulation module are connected by pipes; the fin evaporator 2 in the heat pump circulation module and the PVT heat collecting evaporator 1 are coupled to each other;

[0036] See also Figure 1 The present embodiment provides a transcritical carbon dioxide heat pump coupled to a solar PVT component heating device, wherein the photovoltaic power generation control module includes a photovoltaic inverter 3 and a battery 4; the current input end of the photovoltaic inverter 3 is connected to the current output end of the PVT heat collection evaporator 1 through a wire, and the current output end of the photovoltaic inverter 3 is connected to the current input end of the heat pump circulation module through a wire; the input and output ends of the battery 4 are connected to the output and input ends of the photovoltaic inverter 3 through wires; the photovoltaic inverter 3 can store the electric energy generated by the PVT heat collection evaporator 1 in the battery 4, and can also convert the direct current provided by the battery 4 into alternating current to drive the load in the heat pump circulation module.

[0037] See also Figure 1 , Figure 3The present embodiment provides a transcritical carbon dioxide heat pump coupled to a solar PVT component heating device, wherein the heat pump circulation module includes a compressor 5, a condenser 6, an expansion valve 7 and a fin evaporator 2, wherein the heat pump working fluid channel output ends of the PVT heat collection evaporator 1 and the fin evaporator 2 are connected to the heat pump working fluid channel input end of the compressor 5 through a pipeline, the heat pump working fluid channel output end of the compressor 5 is connected to the heat pump working fluid channel input end of the condenser 6 through a pipeline, and the heat pump working fluid channel output end of the condenser 6 is connected to the heat pump working fluid channel of the expansion valve 7 through a pipeline. The input end is connected to the heat pump working medium channel input end of the PVT heat collection evaporator 1 and the fin evaporator 2 after passing through the expansion valve 7; a heat collection water tank 15 is arranged in the condenser 6; the heat pump working medium flows through the PVT heat collection evaporator 1 and the fin evaporator 2, and takes away the heat through the heat exchange process. The heat pump working medium is compressed by the compressor 5 to increase the temperature and pressure, and then the condensation process is completed in the condenser 6 to release the heat to form a supercooled heat pump working medium, and then after being throttled by the expansion valve 7, it becomes a low-temperature and low-pressure state and flows into the PVT heat collection evaporator 1 and the fin evaporator 2, forming a complete cycle. On the one hand, the flow of heat pump working fluid takes away the useless heat generated by the solar PVT component 14 during operation, thereby achieving the purpose of reducing photovoltaic waste heat, and effectively reducing the temperature of the surface of the solar PVT component 14, thereby improving the electrical conversion rate of the solar PVT component 14. The solar PVT component 14 generates electrical energy to drive the compressor 5 and the condenser 6 in the heat pump circulation module; on the other hand, the heat pump working fluid circulating in the pipeline converts the heat absorbed from the surface of the solar PVT component 14 into usable heat through the heat pump circulation module, thereby further improving the utilization efficiency of solar energy and effectively reducing the generation of photovoltaic waste heat.

[0038] The pipeline is filled with heat pump working fluid, which is carbon dioxide. The heat release process of carbon dioxide in the heat pump circulation module is not condensed in the two-phase zone of the condenser, but releases heat in the area close to or exceeding the critical point. The heat release process is a variable temperature process with a large temperature slip, which just matches the required variable temperature heat source. It is a special Lorentz cycle with a higher heating COP coefficient and can better provide thermal energy.

[0039] See also Figure 2The present embodiment provides a transcritical carbon dioxide heat pump coupled to a solar PVT component heating device, wherein the PVT heat collection evaporator 1 further comprises a plurality of solar PVT components 14, wherein the solar PVT component 14 comprises a glass cover layer 16, an EVA film 18, a photovoltaic cell 17, an EVA film 18 and an aluminum-based back plate 19 arranged in sequence from top to bottom, wherein the aluminum-based back plate 19 comprises a heat exchange fluid channel; the photovoltaic cell 17 of the solar PVT component 14 is connected to the photovoltaic power generation control module through a wire, and the heat exchange fluid channel of the solar PVT component 14 is connected to the heat pump circulation module through a pipeline; the PVT heat collection evaporator The solar PVT assembly 14 in the device 1 can exchange heat with the external environment in the form of radiation. The upper surface of the glass cover layer 16 radiates heat to the sky, and the lower surface of the aluminum-based back plate 19 is coated with a black coating for absorbing scattered radiation and reflected radiation from the ground. The upper surface of the glass cover layer 16 and the lower surface of the aluminum-based back plate 19 perform phase change convection heat exchange with the ambient air during operation. When the temperature of the solar PVT assembly 14 is higher than the external environment temperature, the solar PVT assembly 14 dissipates heat to the outside world. When the temperature of the solar PVT assembly 14 is lower than the external environment temperature, the solar PVT assembly 14 absorbs heat from the external environment.

[0040] Embodiment 2:

[0041] like Figure 1 , Figure 3 As shown, the present embodiment provides a heating device of a transcritical carbon dioxide heat pump coupled with a solar PVT assembly, wherein the water outlet of the heat collecting tank 15 is connected to a heating water supply pipe 10, and the water inlet of the heat collecting tank 15 is connected to a heating water return pipe 11. A first control valve 12 is provided on the heating water supply pipe 10 connected to the water outlet of the heat collecting tank 15, and a second control valve 13 is provided on the heating water return pipe 11 connected to the water inlet of the heat collecting tank 15. When hot water is needed, the first control valve 12 is opened, and the hot water in the heat collecting tank 15 flows into the heating water supply pipe 10 for the user to use; when the water in the heat collecting tank is insufficient, the second control valve 13 is opened, and the cold water in the heating water return pipe 11 flows into the heat collecting tank 15, so as to ensure that there is always sufficient water in the heat collecting tank 15.

[0042] These two solenoid valves can be used to intercept hot water in the water pipe in time, and the water volume and water flow in the water tank can be controlled so that it can be turned on and off as needed.

[0043] Embodiment 3:

[0044] like Figure 1 , Figure 3 As shown, this embodiment provides a heating device of a transcritical carbon dioxide heat pump coupled with a solar PVT component, wherein the heat pump circulation module has two working modes:

[0045] Mode 1: When there is solar radiation, the first solenoid valve assembly 9 connected to the fin evaporator 2 is closed, and the heat pump working fluid runs through the PVT collector evaporator 1 to complete the heating; at this time, the heat pump working fluid flows in the pipeline, and when the heat pump working fluid flows through the PVT collector evaporator 1, the phase change convection heat exchange is completed in the solar PVT component 14, and the working waste heat generated when the solar PVT component 14 is working is taken away. The heat pump working fluid that absorbs the working waste heat flows into the compressor 5, and after being compressed, heated and pressurized by the compressor 5, it flows into the condenser 6, and releases the heat to the heat collection tank 15 in the condenser 6; the condensation process is completed; the supercooled heat pump working fluid after releasing the heat is throttled by the expansion valve 7, and becomes a low-temperature and low-pressure state and flows into the PVT collector evaporator 1, forming a complete cycle.

[0046] Mode 2: When there is no solar radiation, the first solenoid valve assembly 8 connected to the PVT heat collection evaporator 1 is closed, and the solenoid valve 8 connected to the fin evaporator 1 is opened, and the heat pump working fluid runs through the fin evaporator 2 to complete the heating; at this time, the heat pump working fluid flows in the pipeline, and the heat pump working fluid absorbs heat when flowing through the fin evaporator 2. The heat pump working fluid after absorbing heat flows into the compressor 5, and after being compressed, heated and pressurized by the compressor 5, it flows into the condenser 6, and releases the heat to the heat collection tank 15 in the condenser 6 to complete the condensation process; the supercooled heat pump working fluid after releasing the heat is throttled by the expansion valve 7, and becomes a low-temperature and low-pressure state and flows into the fin evaporator 2, forming a complete cycle.

[0047] 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 protection scope of the present invention. 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 heating device of a transcritical carbon dioxide heat pump coupled with a solar PVT assembly, characterized in that: The transcritical carbon dioxide heat pump coupled with a solar PVT assembly heat supply device comprises a PVT heat collecting evaporator (1) and a heat pump circulation module; a finned evaporator (2) is arranged in the heat pump circulation module, the heat pump working fluid output end of the PVT heat collecting evaporator (1) is connected to the heat pump working fluid input end of the heat pump circulation module through a pipeline, and the heat pump working fluid output end of the heat pump circulation module is connected to the heat pump working fluid input end of the PVT heat collecting evaporator (1) through a pipeline; the finned evaporator (2) in the heat pump circulation module is connected in parallel with the PVT heat collecting evaporator (1) through a pipeline, and a switching mechanism for controlling the flow direction of the heat pump working fluid output by the heat pump circulation module is arranged on the pipeline; The heat pump circulation module is also provided with a condensation end for condensation and heat dissipation, wherein the heat generated by heat exchange at the condensation end is used to heat the equipment to be heated; The heat pump working fluid is carbon dioxide; It also includes a photovoltaic power generation control module, which is electrically connected to the PVT heat collection evaporator (1), the heat pump circulation module and the switching mechanism respectively; The photovoltaic power generation control module comprises a photovoltaic inverter (3) and a storage battery (4); the current input end of the photovoltaic inverter (3) is electrically connected to the current output end of the PVT heat collection evaporator (1), and the current output end of the photovoltaic inverter (3) is electrically connected to the current input end of the heat pump circulation module; the storage battery (4) is electrically connected to the power supply end of the photovoltaic inverter (3); The current output end of the photovoltaic inverter-control integrated machine (3) is connected to the power grid; the current output end of the power grid is electrically connected to the current input end of the heat pump circulation module; The switching mechanism comprises a first solenoid valve assembly (8) and a second solenoid valve assembly (9), wherein the first solenoid valve assembly (8) is arranged on the pipeline where the PVT heat collection evaporator (1) is located, and the second solenoid valve assembly (9) is arranged on the pipeline where the fin evaporator (2) is located; The heat pump circulation module comprises a compressor (5), a condenser (6), an expansion valve (7) and a fin evaporator (2); the heat pump working fluid output ends of the PVT heat collection evaporator (1) and the fin evaporator (2) are connected to the heat pump working fluid input end of the compressor (5) through a pipeline, the heat pump working fluid output end of the compressor (5) is connected to the heat pump working fluid input end of the condenser (6) through a pipeline, the heat pump working fluid output end of the condenser (6) is connected to the heat pump working fluid input end of the expansion valve (7) through a pipeline, and then connected to the heat pump working fluid input end of the PVT heat collection evaporator (1) and the fin evaporator (2) through the expansion valve (7); wherein the condenser (6) is the condensing end of the heat pump circulation module; A heat collecting tank (15) is arranged in the condenser (6); the water outlet of the heat collecting tank (15) is connected to a heating water supply pipe (10), and the water inlet of the heat collecting tank (15) is connected to a heating water return pipe (11); A first control valve (12) is provided on the heating water supply pipe (10) connected to the water outlet of the heat collecting tank (15), and a second control valve (13) is provided on the heating water return pipe (11) connected to the water inlet of the heat collecting tank (15); The PVT heat collection evaporator (1) comprises a plurality of solar PVT modules (14); the solar PVT modules (14) comprise a glass cover layer (16), an EVA film (18), a photovoltaic cell sheet (17), an EVA film (18) and an aluminum-based back plate (19) arranged in sequence from top to bottom, and the aluminum-based back plate (19) comprises a heat exchange fluid channel; The photovoltaic cell (17) of the solar PVT assembly (14) is electrically connected to the photovoltaic power generation control module, and the heat exchange fluid channel of the solar PVT assembly (14) is connected to the heat pump circulation module through a pipeline; The glass cover layer (16) on the solar PVT module (14) comprises an upper surface for radiative heat dissipation, and the lower surface of the aluminum-based back plate (19) is coated with a black coating for absorbing radiation; The fin evaporator (2) is provided with a heating chamber.

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