Solar photovoltaic power generation system coupled with thermoelectric power generation

Abstract

The embodiment of the invention provides a solar photovoltaic power generation system coupled with thermoelectric power generation. The solar photovoltaic power generation system comprises a solar photovoltaic panel, a vapor chamber, a plurality of thermoelectric power generation sheets and a plurality of heat dissipation fins, the plurality of thermoelectric power generation sheets are clamped between the back surface of the solar photovoltaic panel and the vapor chamber, the hot ends of the thermoelectric power generation sheets are connected with the back surface of the solar photovoltaic panel, and the cold ends of the thermoelectric power generation sheets are connected with the vapor chamber; the plurality of heat dissipation fins are arranged on one side, deviating from the solar photovoltaic panel, of the vapor chamber at intervals; according to the solar photovoltaic power generation system disclosed by the embodiment of the invention, the thermoelectric power generation technology and the solar photovoltaic power generation are combined, so that power generation can be performed by utilizing the temperature difference between the back surface of the solar photovoltaic panel and the environment, and the part of energy is used for heat dissipation of the back surface of the photovoltaic panel, the temperature of the back plate of the photovoltaic panel is reduced, and the photovoltaic power generation efficiency is improved; and the temperature difference between the cold end and the hot end of the thermoelectric power generation sheet can be improved, the thermoelectric power generation efficiency is further improved, thermoelectric power generation and photovoltaic power generation are coupled, and the power generation efficiency of the whole system is improved.

Description

Technical Field

[0001] The disclosed embodiments belong to the technical field of solar power generation, and specifically relate to a solar photovoltaic power generation system coupled with temperature difference power generation. Background Art

[0002] Photovoltaic power generation technology plays an important role in achieving low-carbon energy transformation. However, the power generation efficiency of photovoltaic panels is significantly affected by the ambient temperature, especially the back temperature, which has a more direct impact on the power generation performance of photovoltaic panels. As photovoltaic panels absorb solar radiation energy, their temperature gradually rises, and the change in back temperature is particularly significant, which directly affects the characteristics of semiconductor materials inside photovoltaic cells. Studies have shown that when the temperature rises, the output voltage of photovoltaic cells will drop significantly, resulting in a decrease in conversion efficiency. Generally speaking, the power generation efficiency of photovoltaic panels may drop by 0.2% to 0.5% for every 1°C increase.

[0003] In order to reduce the negative impact of temperature on photovoltaic power generation efficiency, a variety of cooling technologies have been introduced in the market, such as natural ventilation design, installation of radiators, and use of high thermal conductivity backplane materials. However, the effects of these technologies have certain limitations, especially in high temperature environments, they cannot fully meet the needs of continuous and efficient operation of photovoltaic panels, and the commonly used passive heat dissipation technology has limited cooling effect in high temperature environments. The use of active heat dissipation technologies such as fans will consume electricity, which is not worth the cost. Therefore, how to effectively reduce the temperature on the back of photovoltaic panels and improve power generation efficiency has become a problem that needs to be solved urgently by technicians in this field.

[0004] In view of the above problems, it is necessary to propose a solar photovoltaic power generation system with coupled temperature difference power generation that is reasonably designed and effectively solves the above problems. Summary of the invention

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a solar photovoltaic power generation system coupled with temperature difference power generation.

[0006] The disclosed embodiment provides a solar photovoltaic power generation system coupled with temperature difference power generation, including a solar photovoltaic panel, a heat spreader, a plurality of temperature difference power generation sheets and a plurality of heat dissipation fins;

[0007] A plurality of the thermoelectric power generation sheets are sandwiched between the back side of the solar photovoltaic panel and the heat spreader, wherein the hot end of the thermoelectric power generation sheet is connected to the back side of the solar photovoltaic panel, and the cold end of the thermoelectric power generation sheet is connected to the heat spreader;

[0008] A plurality of heat dissipation fins are arranged at intervals on a side of the heat spreader away from the solar photovoltaic panel.

[0009] Optionally, multiple cooling fans are also included;

[0010] The heat dissipation fans are arranged at both ends of each of the heat dissipation ribs along the length direction thereof; wherein the electric energy generated by the temperature difference power generation sheet is used to power the heat dissipation fans.

[0011] Optionally, both the cold end and the hot end of the temperature differential heat sink are provided with a heat conducting layer.

[0012] Optionally, the material of the heat-conducting layer is thermal grease.

[0013] Optionally, a plurality of heat dissipation fins are arranged on the heat spreader along the length direction of the heat spreader.

[0014] Optionally, a plurality of the heat dissipation fins are arranged at equal intervals on the heat spreader.

[0015] Optionally, a plurality of the temperature difference power generation sheets are arranged on the back side of the solar photovoltaic panel along the length direction of the solar photovoltaic panel.

[0016] Optionally, a plurality of the temperature difference power generation sheets are arranged at equal intervals on the back side of the solar photovoltaic panel.

[0017] Optionally, the thermoelectric power generation sheet adopts a low-temperature thermoelectric power generation sheet, so that the operating temperature range of the thermoelectric power generation sheet is 30°C to 80°C.

[0018] Optionally, the heat spreader is configured to start working when the temperature is higher than 20° C. to achieve uniform heat distribution.

[0019] The solar photovoltaic power generation system coupled with temperature difference power generation of the disclosed embodiment includes a solar photovoltaic panel, a heat spreader, a plurality of temperature difference power generation sheets and a plurality of heat dissipation ribs; the plurality of temperature difference power generation sheets are sandwiched between the back side of the solar photovoltaic panel and the heat spreader, wherein the hot end of the temperature difference power generation sheet is connected to the back side of the solar photovoltaic panel, and the cold end of the temperature difference power generation sheet is connected to the heat spreader; the plurality of heat dissipation ribs are arranged at intervals on the side of the heat spreader away from the solar photovoltaic panel; the solar photovoltaic power generation system of the disclosed embodiment combines temperature difference power generation technology with solar photovoltaic power generation, which can not only generate electricity by utilizing the temperature difference between the back side of the solar photovoltaic panel and the environment, and use this part of energy for heat dissipation on the back side of the photovoltaic panel, thereby reducing the temperature of the photovoltaic panel back plate and improving the efficiency of photovoltaic power generation, but also can improve the temperature difference between the hot and cold ends of the temperature difference power generation sheet, further improving the efficiency of temperature difference power generation, coupling temperature difference power generation with photovoltaic power generation, and improving the power generation efficiency of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of a solar photovoltaic power generation system coupled with temperature difference power generation according to one embodiment of the present disclosure;

[0021] Figure 2This is a plan view of a solar photovoltaic power generation system coupled with temperature difference power generation according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1 and Figure 2 As shown, an embodiment of the present disclosure provides a solar photovoltaic power generation system 100 coupled with temperature difference power generation, including a solar photovoltaic panel 110 , a heat spreader 120 , a plurality of temperature difference power generation sheets 130 and a plurality of heat dissipation fins 140 .

[0024] A plurality of thermoelectric power generation sheets 130 are sandwiched between the back side of the solar photovoltaic panel 110 and the heat spreader 120 , wherein the hot end of the thermoelectric power generation sheet 130 is connected to the back side of the solar photovoltaic panel 110 , and the cold end of the thermoelectric power generation sheet 130 is connected to the heat spreader 120 .

[0025] A plurality of heat dissipation fins 140 are disposed at intervals on a side of the heat spreader 120 away from the solar photovoltaic panel 110 .

[0026] Specifically, under sufficient sunlight, the temperature on the back of the solar photovoltaic panel 110 is relatively high, the hot end of the temperature difference power generation sheet 130 is connected to the back of the solar photovoltaic panel 110, and the cold end of the temperature difference power generation sheet 130 is connected to the heat spreader 120. The other side of the heat spreader 120 is equipped with a heat dissipation rib 140. The heat dissipation rib 140 improves the heat dissipation capacity of the solar photovoltaic panel 110 and improves the power generation efficiency.

[0027] As an important development direction for the development and utilization of clean energy, temperature difference power generation technology uses the Seebeck effect to directly convert thermal energy into electrical energy. It has the advantages of no rotating parts, small size, no pollutant emissions, and high reliability, and can realize the effective utilization of low-grade energy.

[0028] The solar photovoltaic power generation system coupled with temperature difference power generation of the disclosed embodiment combines temperature difference power generation technology with solar photovoltaic power generation. It can not only generate electricity by utilizing the temperature difference between the back of the solar photovoltaic panel and the environment, but also use this part of energy for heat dissipation on the back of the photovoltaic panel, thereby reducing the temperature of the photovoltaic panel backplate and improving the efficiency of photovoltaic power generation. It can also increase the temperature difference between the hot and cold ends of the thermoelectric power generation sheet, further improving the efficiency of thermoelectric power generation. The thermoelectric power generation is coupled with photovoltaic power generation to improve the power generation efficiency of the entire system.

[0029] For example, Figure 1 and Figure 2As shown, the solar photovoltaic power generation system 100 coupled with temperature difference power generation further includes a plurality of cooling fans 150. The cooling fans 150 are arranged at both ends of each cooling rib 140 along its length direction; wherein the electric energy generated by the temperature difference power generation sheet 130 is used to power the cooling fans 150.

[0030] In this embodiment, by arranging cooling fans 140 at both ends of each cooling fin 140 along its length direction, the temperature of the back side of the solar photovoltaic panel 110 can be further reduced, thereby improving the power generation efficiency of solar power generation.

[0031] Specifically, Figure 1 and Figure 2 As shown, the working process of the solar photovoltaic power generation system coupled with temperature difference power generation according to the embodiment of the present disclosure is as follows:

[0032] Under the condition of sufficient sunlight, the temperature of the back of the solar photovoltaic panel 110 is relatively high, the hot end of the thermoelectric sheet 1300 is connected to the back of the solar photovoltaic panel 110, and the cold end of the thermoelectric sheet 130 is connected to the heat spreader 120. The other side of the heat spreader 120 is equipped with a heat dissipation rib 140, and the heat dissipation capacity of the solar photovoltaic panel 110 is improved by the heat dissipation rib 140. The temperature difference between the hot and cold ends of the thermoelectric sheet 130 generates electrical energy, which is used to generate electricity for the cooling fan 150, further reducing the temperature of the back of the solar photovoltaic panel 110 and improving the power generation efficiency of solar power generation.

[0033] Under the natural heat dissipation condition without wind, after reaching the steady state, the temperature of the heat dissipation rib 140 will be close to the temperature of the back of the solar photovoltaic panel 110, and the temperature of the back of the solar photovoltaic panel 110 will be relatively high. After the heat is dissipated by the heat dissipation fan 150, the temperature of the heat dissipation rib 140 will be significantly reduced, and as the wind speed increases, it will be closer to the ambient temperature. At this time, the temperature difference between the cold and hot ends of the thermoelectric power generation sheet 130 is further increased, the efficiency of thermoelectric power generation is improved, the thermoelectric power generation power is further increased, the output power is increased, the speed of the heat dissipation fan 150 can be increased, the heat dissipation efficiency of the heat dissipation rib 140 is further improved, the temperature of the back of the solar photovoltaic panel 110 is reduced, and the efficiency of solar power generation is further improved.

[0034] Exemplarily, both the cold end and the hot end of the temperature difference heat sink 130 are provided with a heat conductive layer, thereby improving the heat conduction efficiency of the cold end and the hot end of the temperature difference heat sink 130. Preferably, in this embodiment, the material of the heat conductive layer can be thermal conductive silicone grease, that is, the cold end and the hot end of the temperature difference heat sink 130 are coated with thermal conductive silicone grease respectively.

[0035] For example, Figure 1 and Figure 2 As shown, a plurality of heat dissipation fins 140 are disposed on the heat vapor chamber 120 along the length direction of the heat vapor chamber 120 .

[0036] Preferably, in this embodiment, a plurality of heat dissipation fins 140 are arranged at equal intervals on the heat spreader 120 .

[0037] In this embodiment, a plurality of heat dissipation fins 140 are arranged at equal intervals on the heat vapor chamber 120 along the length direction of the heat vapor chamber 120 , so as to better achieve heat dissipation of the heat vapor chamber 120 .

[0038] For example, Figure 1 and Figure 2 As shown, a plurality of temperature difference power generation sheets 130 are disposed on the back side of the solar photovoltaic panel 110 along the length direction of the solar photovoltaic panel 110 .

[0039] Preferably, in this embodiment, a plurality of temperature difference power generation sheets 130 are arranged at equal intervals on the back of the solar photovoltaic panel 110, which can better realize temperature difference power generation.

[0040] Specifically, in this embodiment, the thermoelectric power generation sheet 130 can adopt a low-temperature thermoelectric power generation sheet, so that the operating temperature range of the thermoelectric power generation sheet 130 is 30° C. to 80° C., and the maximum power generation efficiency can be achieved within this temperature range.

[0041] Exemplarily, the vapor chamber 120 is configured to start working when the temperature is higher than 20° C. to achieve uniform heat distribution.

[0042] Specifically, the heat spreader 120 is an integral structure with many criss-cross grooves and a liquid wick inside. During manufacturing, the interior is evacuated and then injected with a working fluid with a boiling point below 30°C. The heat spreader can start working at a temperature above 20°C, and the entire heat spreader 120 achieves uniform heat distribution.

[0043] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the embodiments of the present disclosure, but the embodiments of the present disclosure are not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of the present disclosure.

Claims

1. A solar photovoltaic power generation system coupled with temperature difference power generation, characterized in that: It includes a solar photovoltaic panel, a heat spreader, a plurality of temperature difference power generation sheets and a plurality of heat dissipation fins; A plurality of the thermoelectric power generation sheets are sandwiched between the back side of the solar photovoltaic panel and the heat spreader, wherein the hot end of the thermoelectric power generation sheet is connected to the back side of the solar photovoltaic panel, and the cold end of the thermoelectric power generation sheet is connected to the heat spreader; A plurality of heat dissipation fins are arranged at intervals on a side of the heat spreader away from the solar photovoltaic panel.

2. The system according to claim 1, characterized in that Also included are multiple cooling fans; The heat dissipation fans are arranged at both ends of each of the heat dissipation ribs along the length direction thereof; wherein the electric energy generated by the temperature difference power generation sheet is used to power the heat dissipation fans.

3. The system according to claim 1, characterized in that The cold end and the hot end of the temperature difference heat sink are both provided with a heat conducting layer.

4. The system according to claim 3, characterized in that The material of the heat-conducting layer is thermally conductive silicone grease.

5. The system according to any one of claims 1 to 3, characterized in that: A plurality of heat dissipation fins are arranged on the heat spreader along the length direction of the heat spreader.

6. The system according to claim 5, characterized in that A plurality of heat dissipation fins are arranged at equal intervals on the heat spreader.

7. The system according to any one of claims 1 to 3, characterized in that: A plurality of the temperature difference power generation sheets are arranged on the back side of the solar photovoltaic panel along the length direction of the solar photovoltaic panel.

8. The system according to claim 7, characterized in that A plurality of the temperature difference power generation sheets are arranged at equal intervals on the back side of the solar photovoltaic panel.

9. The system according to any one of claims 1 to 3, characterized in that: The thermoelectric power generation sheet adopts a low-temperature thermoelectric power generation sheet, so that the operating temperature range of the thermoelectric power generation sheet is 30° C. to 80° C.

10. The system according to any one of claims 1 to 3, characterized in that: The heat spreader is used to start working when the temperature is higher than 20° C. to achieve uniform heat distribution.

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