Energy supply system based on double-glass PV / T assembly

Abstract

The utility model discloses an energy supply system based on a double-glass PV / T assembly, which belongs to the field of heat recovery of the double-glass assembly, and comprises a plurality of groups of double-glass PV / T units, a heat exchange unit and a power supply unit, each group of double-glass PV / T units comprises a double-glass assembly and a glass interlayer arranged on the surface of the double-glass assembly, the glass interlayers of two adjacent groups of double-glass PV / T units are communicated in sequence, and the heat exchange unit is connected with the power supply unit. The glass interlayer of the double-glass PV / T unit located on the outermost side communicates with the heat exchange unit through a pipeline, and the heat exchange unit communicates with the heat dissipation tail end through the ground source heat pump heat exchange unit. The double-glass assembly is electrically connected with the power supply unit. By the adoption of the energy supply system based on the double-glass PV / T assembly, power generation of the photovoltaic assembly is not affected, meanwhile, the problem that the power generation rate is affected due to the fact that the surface temperature of the photovoltaic assembly cannot be taken away in time can be solved, heat is recycled, and the system is more energy-saving and environmentally friendly.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery technology for double-glass modules, and in particular to an energy supply system based on double-glass PV / T modules. Background Technology

[0002] Currently, photovoltaic (PV) power generation is widely used globally. As the world's largest PV market, China ranks among the world's top in both installed PV capacity and power generation, and its PV technology has made continuous progress. Various types of PV cells, such as high-efficiency crystalline silicon cells, thin-film cells, and dye-sensitized solar cells, are emerging, significantly improving their conversion efficiency and lifespan.

[0003] Photovoltaic-storage-charging integrated power stations can store electrical energy after photovoltaic power generation. Photovoltaic, energy storage and charging facilities form a microgrid and can realize two different operating modes, grid-connected and off-grid, according to demand. They can also participate in ancillary services such as grid peak regulation and frequency regulation, peak shaving and valley filling by leveraging the technical characteristics of photovoltaic, energy storage and charging.

[0004] However, the mutual utilization between photovoltaics and solar thermal energy is mainly reflected in the integrated utilization technology of solar photovoltaics and solar thermal energy, which combines photovoltaic cells with solar thermal collection technology. While converting solar energy into electrical energy, the power generation efficiency of crystalline silicon solar cells depends on their operating temperature. For every 1°C increase in temperature, the output power will decrease by 0.4% to 0.5%. Since more than 80% of the energy reaching the cell surface is converted into heat, the operating temperature of solar cells is usually above 50°C, and can even reach 80°C when heat dissipation is poor, thus seriously affecting the working efficiency of solar cells.

[0005] To address the aforementioned issues, the current market uses inflatable refrigerant evaporator plates as heat collectors, also known as PV / T collectors, to cool the battery string and utilize the collected heat to meet users' demands for high-quality electricity and low-quality heat energy.

[0006] However, the current PV / T collector market only supports single-glass modules. Metal heat collectors or other heat collectors can only be installed on the back of single-glass modules. Double-glass photovoltaic modules, on the other hand, generate electricity from both sides, making it impossible to install metal heat collectors or other heat collectors to remove the heat generated by the cell string. This inability to control the operating temperature of the cell string further impacts the efficiency of double-glass modules. Utility Model Content

[0007] The purpose of this invention is to provide an energy supply system based on double-glass PV / T modules to solve the above-mentioned technical problems.

[0008] To achieve the above objectives, this utility model provides an energy supply system based on double-glass PV / T modules, including multiple sets of double-glass PV / T units, a heat exchange unit, and a power supply unit. Each set of double-glass PV / T units includes a double-glass module and a glass interlayer disposed on the surface of the double-glass module. The glass interlayers of two adjacent sets of double-glass PV / T units are connected in sequence. The glass interlayer of the outermost double-glass PV / T unit is connected to the heat exchange unit via a pipeline. The heat exchange unit is connected to the heat dissipation terminal via a ground source heat pump heat exchange unit.

[0009] The double-glass module is electrically connected to the power supply unit.

[0010] Preferably, the double-glass module includes an outer frame and, from top to bottom, a first tempered glass, an EVA protective layer, a photovoltaic cell string, an EVA protective layer, a second tempered glass, an EVA protective layer, at least one tempered glass support frame, an EVA protective layer, and a third tempered glass, which are arranged sequentially on the inner side of the outer frame. A glass interlayer is formed between the third tempered glass and the second tempered glass, and the glass interlayer is filled with pure water.

[0011] The glass interlayer has flow holes at all four corners, which are connected to the flow holes of the adjacent double-glass PV / T unit or to the heat exchange unit via pipes.

[0012] Preferably, the connection path between multiple sets of double-glass PV / T units is U-shaped;

[0013] The flow hole is threaded with a pipe fitting for connecting pipelines.

[0014] Preferably, the heat exchange unit includes a heat exchange box and a heat exchange coil disposed inside the heat exchange box. The cooling water inlet and outlet of the heat exchange box are respectively connected to the glass interlayer of the outermost double-glass PV / T unit through pipelines. A first circulation pump is disposed on one of the pipelines between the heat exchange box and the glass interlayer.

[0015] Preferably, the ground source heat pump heat exchange unit includes a ground source heat exchange module and a ground source heat pump main module. The ground source heat exchange module includes multiple parallel underground hot pipes, which are connected to the inlet and outlet ends of the heat exchange coil via ground source heat return water pipe and ground source heat outlet water pipe, respectively.

[0016] The main module of the ground source heat pump includes a first heat exchanger and a second heat exchanger arranged in sequence. One side of the first heat exchanger is connected to the ground source heat return water pipe and the ground source heat outlet water pipe, respectively. A second circulation pump is installed between the ground source heat outlet water pipe and the second heat exchanger. The two ends of the other side of the first heat exchanger are connected to one side of the second heat exchanger through an expansion valve and a reversing valve, respectively. The second heat exchanger is connected to the heat dissipation terminal. A third circulation pump is installed on the pipeline between the second heat exchanger and the heat dissipation terminal.

[0017] A compressor is also installed between the reversing valve and the first heat exchanger. The main inlet of the reversing valve is connected to the outlet of the compressor, and the inlet of the compressor is connected to the intermediate port of the reversing valve. The reversing valve is configured such that the single-pass copper tube end is connected to the second heat exchanger when it is energized, and the single-pass copper tube end inlet is connected to the first heat exchanger when it is not energized.

[0018] Preferably, the first, second, and third circulating pumps are all connected in parallel with a standby circulating pump. A shut-off valve is provided on both sides of the standby circulating pump. The first, second, third, and standby circulating pumps, as well as the shut-off valves, are all electrically connected to the controller. The controller is also electrically connected to the expansion valve, the reversing valve, and the compressor, respectively.

[0019] Preferably, the power supply unit includes an integrated inverter control unit whose input terminal is electrically connected to the photovoltaic cells of the double-glass module in series, and whose output terminal is electrically connected to the charging pile, the power distribution cabinet and the energy storage cabinet respectively. The power distribution cabinet is electrically connected to the mains power.

[0020] The integrated reverse control unit is also electrically connected to the controller.

[0021] Therefore, the beneficial effects of this utility model using the above-mentioned energy supply system based on double-glass PV / T modules are as follows:

[0022] 1. By setting a glass interlayer on the back of the double-glass module and filling it with pure water as a cooling medium, the operating temperature of the battery string is effectively controlled, and the photoelectric conversion efficiency is improved. Especially in high-temperature environments, the good heat dissipation effect helps to maintain the stable power generation of the photovoltaic module.

[0023] 2. The heat exchange unit includes high-efficiency heat exchange coils, which, combined with the ground source heat pump heat exchange unit, achieve a higher COP (coefficient of performance) value, thus significantly improving the system's thermal energy utilization rate and reducing operating costs;

[0024] 3. The closed-loop water circulation system avoids the loss of cooling medium and extends the system's service life. Furthermore, using purified water as the cooling medium is more environmentally friendly and healthier.

[0025] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 This is an overall layout diagram of a power supply system based on double-glass PV / T modules according to this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of a double-glass module in a double-glass PV / T module power supply system according to the present invention.

[0028] Figure Labels

[0029] 1. Double-glass PV / T unit; 11. Flow hole; 12. First tempered glass; 13. EVA protective layer; 14. Photovoltaic cell string; 15. Second tempered glass; 16. Tempered glass support frame; 17. Third tempered glass; 18. Outer frame; 2. Heat exchange unit; 21. Heat exchange box; 22. Heat exchange coil; 23. First circulation pump; 3. Ground source heat exchange module; 31. Buried ground heat pipeline; 32. Ground source heat return water pipe; 33. Ground source heat outlet water pipe; 34. Second circulation pump; 4. Ground source heat pump main module; 41. First heat exchanger; 42. Compressor; 43. Reversing valve; 44. Second heat exchanger; 45. Third circulation pump; 46. Expansion valve; 5. Controller; 6. Heat dissipation terminal; 7. Power supply unit; 71. Reverse control integrated machine; 72. Energy storage cabinet; 73. Charging pile; 74. Distribution cabinet; 8. Backup circulation pump. Detailed Implementation

[0030] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0032] like Figure 1 and Figure 2 As shown, an energy supply system based on double-glass PV / T modules includes multiple sets of double-glass PV / T units 1, heat exchange units 2, and power supply units 7. Each set of double-glass PV / T units 1 includes a double-glass module and a glass interlayer disposed on the surface of the double-glass module. The glass interlayers of two adjacent sets of double-glass PV / T units 1 are connected sequentially. The glass interlayer of the outermost double-glass PV / T unit 1 is connected to the heat exchange unit 2 via a pipeline. The heat exchange unit 2 is connected to the heat dissipation terminal 6 via a ground source heat pump heat exchange unit 2. The double-glass module is electrically connected to the power supply unit 7.

[0033] Specifically, the double-glass module includes an outer frame 18 and, from top to bottom, a first tempered glass 12, an EVA protective layer 13, a photovoltaic cell string 14, an EVA protective layer 13, a second tempered glass 15, an EVA protective layer 13, at least one tempered glass support frame 16, an EVA protective layer 13, and a third tempered glass 17, which are arranged sequentially inside the outer frame 18. A glass interlayer is formed between the third tempered glass 17 and the second tempered glass 15, and the glass interlayer is filled with pure water. Flow holes 11 are provided at each of the four corners of the third tempered glass 17. The flow holes 11 are connected to the flow holes 11 of the adjacent double-glass PV / T unit 1 via pipes or to the heat exchange unit 2 via pipes.

[0034] The connection path between multiple sets of double-glass PV / T units 1 is U-shaped to increase the flow path; the flow hole 11 is threaded with a pipe fitting for connecting pipelines.

[0035] The heat exchange unit 2 includes a heat exchange box 21 and a heat exchange coil 22 disposed inside the heat exchange box 21. The cooling water inlet and outlet of the heat exchange box 21 are respectively connected to the glass interlayer of the outermost double-glass PV / T unit 1 through pipelines. A first circulation pump 23 is disposed on one of the pipelines between the heat exchange box and the glass interlayer. A temperature sensor is also disposed inside the heat exchange box 21. The temperature sensor is electrically connected to the controller 5.

[0036] The ground source heat pump heat exchange unit 2 includes a ground source heat exchange module 3 and a ground source heat pump main module 4. The ground source heat exchange module 3 includes multiple parallel underground hot water pipes 31, which are connected to the inlet and outlet ends of the heat exchange coil 22 via ground source heat return water pipe 32 and ground source heat outlet water pipe 33, respectively. The ground source heat pump main module 4 includes a first heat exchanger 41 and a second heat exchanger 44 arranged in sequence. One side of the first heat exchanger 41 is connected to the ground source heat return water pipe 32 and the ground source heat outlet water pipe 33, respectively. A second circulation pump 34 is installed between the ground source heat outlet water pipe 33 and the second heat exchanger 44. The other two ends of the first heat exchanger 41 are connected to the ground source heat return water pipe 32 and the ground source heat outlet water pipe 33, respectively. The expansion valve 46 and the reversing valve 43 are respectively connected to one side of the second heat exchanger 44. The second heat exchanger 44 is connected to the heat dissipation terminal 6. A third circulation pump 45 is installed on the pipeline between the second heat exchanger 44 and the heat dissipation terminal 6. A compressor 42 is also installed between the reversing valve 43 and the first heat exchanger 41. The main inlet of the reversing valve 43 is connected to the outlet of the compressor 42, and the inlet of the compressor 42 is connected to the middle pipe port of the reversing valve 43. The reversing valve 43 is configured such that the single-pass copper pipe end is connected to the second heat exchanger 44 when it is energized, and the single-pass copper pipe end inlet is connected to the first heat exchanger 41 when it is not energized.

[0037] The first circulating pump 23, the second circulating pump 34, and the third circulating pump 45 are all connected in parallel with a standby circulating pump 8. A shut-off valve is provided on both sides of the standby circulating pump 8. The first circulating pump 23, the second circulating pump 34, the third circulating pump 45, the standby circulating pump 8, and the shut-off valves are all electrically connected to the controller 5. The controller 5 is also electrically connected to the expansion valve 46, the reversing valve 43, and the compressor 42, respectively.

[0038] The heating process based on the above structure is as follows:

[0039] 1. Collecting heat generated by double-glass PV / T unit 1: The heat generated by the photovoltaic cell string in double-glass PV / T unit 1 is transferred to the pure water in the glass interlayer, thereby reducing the temperature of the cell string, ensuring its power generation efficiency, and realizing heat collection at the same time.

[0040] 2. Heat exchange: After heat exchange, the water flows sequentially in a concave path between two adjacent double-glass PV / T units 1 until it reaches the outermost double-glass PV / T unit 1, and then enters the heat exchange unit 2. The water in the heat exchange coil 22 is introduced into the thermal buried pipe 31 for heat exchange and cooling, and then re-enters the outermost double-glass PV / T unit 1 to achieve circulation.

[0041] Meanwhile, the water in the heat exchange coil 22 is heated and then enters the underground pipeline through the ground source heat return water pipe 32. It exchanges heat with the soil in the pipeline and absorbs heat. After that, it flows out through the ground source heat outlet water pipe 33 to the first heat exchanger 41. After exchanging heat with the refrigerant, it enters the heat exchange coil 22 to achieve circulation.

[0042] After absorbing heat, the refrigerant in the first heat exchanger 41 vaporizes from a liquid state to a gaseous state. The compressor 42 compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas. This high-temperature, high-pressure refrigerant gas enters the second heat exchanger 44 and exchanges heat with the low-temperature medium on the other side. After the low-temperature medium is heated, it enters the heat dissipation terminal 6 for heating. Meanwhile, the refrigerant gas gradually condenses into a high-pressure liquid and enters the first heat exchanger 41 again after passing through the expansion valve 46, thus achieving a cycle.

[0043] The power supply unit 7 includes an integrated inverter and controller 71 whose input terminal is electrically connected to the photovoltaic cell string 14 of the double-glass module. The output terminal of the integrated inverter and controller 71 is electrically connected to the charging pile 73, the power distribution cabinet 74 and the energy storage cabinet 72 respectively. The power distribution cabinet 74 is electrically connected to the mains power. The integrated inverter and controller 71 is also electrically connected to the controller 5.

[0044] The power supply principle based on the above structure is as follows:

[0045] The DC power output from the battery strings of multiple double-glass PV / T units 1 is converted into AC power by the inverter control unit 71. The inverter control unit 71 transmits the AC power to the energy storage cabinet 72 for storage, while charging the charging pile 73. It also uses the distribution cabinet 74 to participate in auxiliary services such as grid peak regulation, frequency regulation, peak shaving and valley filling.

[0046] It should be noted that the above electronic components are all mature products on the market. This embodiment only requires purchasing them and connecting them according to the instruction manual. No modifications have been made to them. Therefore, their circuit connection structure and principle will not be described in detail here.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A power supply system based on double-glass PV / T modules, characterized in that: It includes multiple sets of double-glass PV / T units, heat exchange units and power supply units. Each set of double-glass PV / T units includes a double-glass module and a glass interlayer disposed on the surface of the double-glass module. The glass interlayers of two adjacent sets of double-glass PV / T units are connected in sequence. The glass interlayer of the outermost double-glass PV / T unit is connected to the heat exchange unit through a pipeline. The heat exchange unit is connected to the heat dissipation terminal through a ground source heat pump heat exchange unit. The double-glass module is electrically connected to the power supply unit.

2. The energy supply system based on double-glass PV / T modules according to claim 1, characterized in that: The double-glass module includes an outer frame and, from top to bottom, a first tempered glass, an EVA protective layer, a photovoltaic cell string, an EVA protective layer, a second tempered glass, an EVA protective layer, at least one tempered glass support frame, an EVA protective layer, and a third tempered glass, which are arranged sequentially inside the outer frame. A glass interlayer is formed between the third tempered glass and the second tempered glass, and the glass interlayer is filled with pure water. The glass interlayer has flow holes at all four corners, which are connected to the flow holes of the adjacent double-glass PV / T unit or to the heat exchange unit via pipes.

3. The energy supply system based on double-glass PV / T modules according to claim 2, characterized in that: The connection paths between multiple sets of double-glass PV / T units are U-shaped; The flow hole is threaded with a pipe fitting for connecting pipelines.

4. The energy supply system based on double-glass PV / T modules according to claim 3, characterized in that: The heat exchange unit includes a heat exchange box and a heat exchange coil installed inside the heat exchange box. The cooling water inlet and outlet of the heat exchange box are connected to the glass interlayer of the outermost double-glass PV / T unit via pipelines. A first circulation pump is installed on one of the pipelines between the heat exchange box and the glass interlayer.

5. The energy supply system based on double-glass PV / T modules according to claim 4, characterized in that: The ground source heat pump heat exchange unit includes a ground source heat exchange module and a ground source heat pump main module. The ground source heat exchange module includes multiple parallel underground hot pipes, which are connected to the inlet and outlet ends of the heat exchange coil via ground source heat return water pipes and ground source heat outlet water pipes, respectively. The main module of the ground source heat pump includes a first heat exchanger and a second heat exchanger arranged in sequence. One side of the first heat exchanger is connected to the ground source heat return water pipe and the ground source heat outlet water pipe, respectively. A second circulation pump is installed between the ground source heat outlet water pipe and the second heat exchanger. The two ends of the other side of the first heat exchanger are connected to one side of the second heat exchanger through an expansion valve and a reversing valve, respectively. The second heat exchanger is connected to the heat dissipation terminal. A third circulation pump is installed on the pipeline between the second heat exchanger and the heat dissipation terminal. A compressor is also installed between the reversing valve and the first heat exchanger. The main inlet of the reversing valve is connected to the outlet of the compressor, and the inlet of the compressor is connected to the intermediate port of the reversing valve. The reversing valve is configured such that the single-pass copper tube end is connected to the second heat exchanger when it is energized, and the single-pass copper tube end inlet is connected to the first heat exchanger when it is not energized.

6. The energy supply system based on double-glass PV / T modules according to claim 5, characterized in that: The first, second, and third circulating pumps are all connected in parallel with a standby circulating pump. Each of the standby circulating pumps has a shut-off valve on both sides. The first, second, third, and standby circulating pumps, as well as the shut-off valves, are all electrically connected to the controller. The controller is also electrically connected to the expansion valve, the reversing valve, and the compressor, respectively.

7. A power supply system based on double-glass PV / T modules according to claim 6, characterized in that: The power supply unit includes an integrated inverter control unit whose input terminal is electrically connected to the photovoltaic cells of the double-glass module in series. The output terminal of the integrated inverter control unit is electrically connected to the charging pile, the power distribution cabinet and the energy storage cabinet respectively. The power distribution cabinet is electrically connected to the mains power. The integrated reverse control unit is also electrically connected to the controller.

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