Photovoltaic cooling and waste heat utilization device

Abstract

The invention discloses a photovoltaic cooling and waste heat utilization device. The photovoltaic cooling and waste heat utilization device comprises a photovoltaic panel, a heat storage box, a flat heat pipe and a carrier. The heat storage box is composed of a box body, heat conduction ceramic, a thermoelectric power generation piece, a phase change material and the like, waste heat generated in the working process of the photovoltaic panel can be effectively recycled and converted into electric energy through the thermoelectric power generation piece, meanwhile, the photovoltaic panel is cooled through the phase change material, and the power generation efficiency is improved. The flat heat pipe transmits waste heat to external equipment for further utilization, and diversified waste heat recovery and conversion are achieved. The flat heat pipe is further used for reversely inputting heat into the heat storage box when the temperature of the photovoltaic panel is lower than the set temperature. The device is compact in structure, has good thermal conductivity and heat preservation performance, can keep stable work in different environments, and improves the overall performance of a photovoltaic system.

Description

Technical Field

[0001] The present invention relates to a photovoltaic panel cooling and waste heat utilization device. Background Art

[0002] During the long-term operation of a photovoltaic panel, the surface temperature of the photovoltaic panel rises. Especially in a high-temperature environment, too high a temperature will affect the power generation efficiency and service life of the photovoltaic panel. Therefore, how to effectively cool the photovoltaic panel and recover the waste heat generated by it has become one of the key technologies to improve the performance of the photovoltaic panel. Existing cooling systems generally reduce the temperature of the photovoltaic panel by methods such as air cooling and liquid cooling. However, the energy efficiency utilization of these methods is relatively low, and the cooling effect is limited by the ambient temperature, and the waste heat cannot be fully utilized. For this reason, designing a photovoltaic power generation system that combines cooling and waste heat recovery and utilization has high practical value. Summary of the Invention

[0003] Object of the Invention: Aiming at the above-mentioned existing technology, a photovoltaic cooling and waste heat utilization device is proposed, which can effectively recover and utilize the waste heat generated by the photovoltaic panel during operation, and improve the power generation efficiency and energy utilization rate of the photovoltaic panel.

[0004] Technical Solution: A photovoltaic cooling and waste heat utilization device includes a photovoltaic panel, a heat storage tank, a flat heat pipe, and a carrier rack; The heat storage tank includes a copper heat conduction pad, an upper box body heat conduction ceramic, a heat storage tank box body, a thermoelectric generation sheet, an upper half box body of the material box, a lower half box body of the material box, a lower box body heat conduction ceramic, and a heat storage tank base; The heat storage tank box body is a hollow structure formed by side walls, and the photovoltaic panel is fixed on the top of the heat storage tank box body; a number of thermoelectric generation sheets that generate electricity through the temperature difference inside and outside the heat storage tank box body are respectively embedded on a set of opposite side walls of the heat storage tank box body; the upper half box body of the material box is a hollow structure formed by side walls, and a number of heat dissipation holes are provided on the side walls; the upper box body heat conduction ceramic is fixed on the top of the upper half box body of the material box; the upper half box body of the material box is fixed inside the heat storage tank box body; the copper heat conduction pad is filled between the photovoltaic panel and the upper box body heat conduction ceramic, and a heat conduction adhesive is provided between the connecting surfaces of each other; The lower half box body of the material box is also located inside the heat storage tank box body. The lower half box body of the material box is a hollow structure formed by side walls, and a number of heat dissipation holes are provided on the side walls; the lower box body heat conduction ceramic is fixed at the bottom of the lower half box body of the material box, and a composite phase change material is provided in the formed material bin; the heat storage tank base is fixed at the bottom of the lower half box body of the material box, and a closely arranged flat heat pipe is provided between the two; the flat heat pipe extends from the bottom end of a side wall of the heat storage tank box body to the outside of the heat storage tank box body, and the cold end is used to connect to external equipment; The assembly of the photovoltaic panel, the heat storage tank, and the flat heat pipe is arranged on the carrier rack, and a storage battery is arranged on the carrier rack. The photovoltaic panel and the thermoelectric generation sheet are connected to the storage battery through wires.

[0005] Furthermore, the heat storage tank further includes a partition plate for dividing the material bin into several small bins, and the composite phase change material is provided in each small bin.

[0006] Furthermore, the number and positions of the heat dissipation holes on the side walls of the upper half box body and the lower half box body of the material box correspond to each other.

[0007] Furthermore, the lower half box body of the material box is placed inside the upper half box body of the material box, and the two are nested and can slide up and down relative to each other.

[0008] Furthermore, a groove is provided at the bottom end of one side wall of the heat storage tank body. In the structure of the assembly, the flat heat pipe passes through the groove by insertion and extends to the outside of the heat storage tank body.

[0009] Furthermore, the composite phase change material is filled into a pocket made of fluorosilicone rubber and then placed in the material bin.

[0010] Furthermore, a gap is left between the upper half box body of the material box and the heat storage tank body; a boss is provided on the outer side of the bottom end of the lower half box body of the material box, the heat sealing block is bonded to the boss, a gap is left between the inner side wall of the heat sealing block and the outer side wall of the lower half box body of the material box, the inner side wall of the heat sealing block is in close contact with the outer side surface of the upper half box body of the material box, and the outer side wall of the heat sealing block is in close contact with the inner side wall of the heat storage tank body. The joint surfaces are all treated with oil seal.

[0011] Furthermore, a concave platform corresponding to the shape of the photovoltaic panel is provided on the inner side of the top of the heat storage tank body. After the photovoltaic panel is embedded, the periphery of the photovoltaic panel is pressed by an upper sealing frame fixedly connected to the top of the heat storage tank body.

[0012] Furthermore, a concave platform is provided near the inner side of the bottom surface of the boss, the lower box body heat conducting ceramic is bonded in the concave platform, and the lower bottom surface of the lower box body heat conducting ceramic is flush with the bottom surface of the boss.

[0013] Furthermore, the cold end of the flat heat pipe is used to connect an external heat collection device to recover the excess heat after the complete phase change of the composite phase change material; or it is used to connect an external device generating waste heat to reversely input heat into the heat storage tank when the temperature of the photovoltaic panel is lower than the set temperature.

[0014] Beneficial effects: 1. The photovoltaic cooling and waste heat utilization device of the present invention can reduce the temperature of the photovoltaic panel while effectively recovering and utilizing the waste heat, improving the energy utilization rate of the photovoltaic system.

[0015] 2. The device has a compact structure, good heat conduction performance and heat preservation characteristics, and can adapt to various environmental conditions and work stably.

[0016] 3. Through modular design, this device can be expanded and upgraded according to actual needs, with good flexibility and operability.

[0017] 4. This device can not only cool the photovoltaic panels and improve the power generation efficiency, but also convert the waste heat into electrical energy, further improving the overall energy utilization efficiency. Brief Description of the Drawings

[0018] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the exploded view of the structure of the heat storage box; Figure 3 is the structural schematic diagram of the carrier rack, where (a) is the bottom view and (b) is the isometric view; Figure 4 is the structural schematic diagram of the heat storage box body; Figure 5 is the structural schematic diagram of the upper box body of the material box; Figure 6 is the structural schematic diagram of the lower box body of the material box, where (a) is the isometric view and (b) is the front view; Figure 7 is the structural schematic diagram of the heat storage box base; Figure 8 is the structural schematic diagram of the upper sealing frame of the heat storage box; Figure 9 is the sectional view of the assembly of the present invention. Detailed Description of the Invention

[0019] The following further explains the present invention with reference to the drawings.

[0020] As Figure 1 shown, a photovoltaic cooling and waste heat utilization device includes a photovoltaic panel 1, a heat storage box 2, a flat heat pipe 3, and a carrier rack 4.

[0021] As Figure 2 shown, the heat storage box 2 includes a copper heat conduction pad 201, an upper box body heat conduction ceramic 202, a heat storage box body 203, a thermoelectric generation sheet 204, an upper half box body of the material box 205, a partition board 206, a heat sealing block 207, a lower half box body of the material box 208, a lower box body heat conduction ceramic 209, a heat storage box base 210, and a heat storage box upper sealing frame 211.

[0022] As Figure 4As shown, the whole heat storage box body 203 is a hollow structure formed by side walls. There is a concave platform 2032 on the inner side of the top. The whole photovoltaic panel 1 is embedded in the concave platform 2032, and the upper surface of the photovoltaic panel 1 is flush with the top surface of the heat storage box body 203. A plurality of threaded holes 2031 are evenly arranged on the top surface of the heat storage box body 203. The upper sealing frame 211 is connected to the threaded holes 2031 on the top surface of the heat storage box body 203 through screws and presses the periphery of the photovoltaic panel 1.

[0023] On a set of opposite side walls of the heat storage box body 203, a number of square holes 2034 are respectively provided. Each thermoelectric generator 204 is respectively inlaid in the square holes 2034, and the hot end surface of the thermoelectric generator 204 is flush with the surface of the inner side wall of the heat storage box body 203, and the cold end surface of the thermoelectric generator 204 faces outward.

[0024] In addition, a plurality of threaded holes 2033 are horizontally and evenly arranged on the inner side wall of the heat storage box body 203 at the position below the concave platform 2032. There is a groove 2035 at the bottom end of the side wall of the heat storage box body 203 where the square hole 2034 is provided. This groove 2035 is used for the flat heat pipe 3 to pass through the groove 2035 by insertion during the subsequent assembly of the overall structure, improving the airtightness of the overall structure.

[0025] As Figure 5 shown, the upper half box body 205 of the material box is a hollow structure formed by side walls, and a number of heat dissipation holes 2053 are provided on the side walls. There is a concave platform 2054 on the inner side of the top of the upper half box body 205 of the material box. The upper box body heat conducting ceramic 202 is fixed in the concave platform 2054 by bonding, and the upper surface of the upper box body heat conducting ceramic 202 is flush with the top surface of the upper half box body 205 of the material box, which is used to ensure the efficient heat transfer between the upper box body heat conducting ceramic 202 and the copper heat conducting pad 201 in the subsequent assembled structure.

[0026] The upper half box body 205 of the material box is located inside the heat storage box body 203. There is a convex platform 2051 on the outer side of the top of the upper half box body 205 of the material box. Threaded holes 2052 are evenly arranged on the outer side edge of the convex platform 2051. The threaded holes 2052 are matched with the threaded holes 2033 on the heat storage box body 203. The heat storage box body 203 and the upper half box body 205 of the material box are connected and fixed by screws. There is a gap between the outer side surface of the upper half box body 205 of the material box and the inner side wall of the heat storage box body 203, which is convenient for the outer side wall of the heat sealing block 207 to be closely attached to the inner side wall of the heat storage box body 203 during the subsequent overall assembly of the structure.

[0027] The copper heat conducting pad 201 is filled between the photovoltaic panel 1 and the upper box body heat conducting ceramic 202, and the upper and lower surfaces of the copper heat conducting pad 201 are closely attached to the photovoltaic panel 1 and the upper box body heat conducting ceramic 202 respectively through heat conducting glue to ensure that the heat of the photovoltaic panel 1 can be quickly transferred to the upper box body heat conducting ceramic 202.

[0028] AsFigure 6 As shown, the lower half box body 208 of the material box is a hollow structure formed by side walls. A number of heat dissipation holes 2082 are provided on the side walls, and the number and positions of the heat dissipation holes 2082 correspond to the heat dissipation holes 2053 on the upper half box body 205 of the material box.

[0029] A boss 2081 is provided on the outer side of the bottom end of the lower half box body 208 of the material box. A concave platform 2084 is provided near the inner side of the bottom surface of the boss 2081. The lower box body heat conduction ceramic 209 is bonded in the concave platform 2084, and the lower bottom surface of the lower box body heat conduction ceramic 209 is flush with the bottom surface of the boss 2081. The lower half box body 208 of the material box and the lower box body heat conduction ceramic 209 together form a material storage bin. Since the composite phase change material in the solid state has anisotropy, in order to avoid the difference in the phase change speed in different regions in the material storage bin due to the different heat absorption and heat transfer performances in different regions, which will further lead to a more uneven volume expansion process of the composite phase change material, thus affecting the balance of the system structure; at the same time, it will also lead to stress concentration in the stressed area, reducing the service life of the components; in addition, due to uneven heating, a part of the "dead zone" may be generated inside the composite phase change material and does not participate in the phase change process, increasing the working pressure of the remaining phase change material and ultimately accelerating the aging of the composite phase change material. Therefore, the material storage bin is evenly divided into a number of small material storage bins by using a partition plate 206, that is, the composite phase change material is divided into several parts, and the manifestation of anisotropy is reduced by reducing the surface area of each part of the material in contact with the heat transfer area, so that the heating of the composite phase change material tends to be uniform and the influence on the system caused by uneven heating is avoided.

[0030] By replacing different types of composite phase change materials in the material storage bin, different heat storage and cooling capabilities can be obtained. The composite phase change material is filled into a pocket made of fluorosilicone rubber, and the bag mouth is sealed with glue to prevent the phase change material from leaking when it changes to the liquid state, and the leaked liquid will solidify and block the system after leakage. Fluorosilicone rubber has excellent high temperature performance and ductility as well as good corrosion resistance and chemical resistance, and can adapt to an environment with a large temperature change. The composite phase change material provides cooling or heat preservation effects for the photovoltaic panels in different environments through phase change, and creates a temperature difference in the heat storage box 2 to provide working conditions for the thermoelectric generation sheet 204.

[0031] The heat sealing block 207 is bonded to the boss 2081, and a gap is left between the inner wall of the heat sealing block 207 and the outer wall of the lower half box 208 of the material box. The lower half box 208 of the material box is also located in the heat storage box body 203, and the lower half box 208 of the material box is placed inside the upper half box 205 of the material box, and the two are nested and can slide up and down with each other. The inner wall of the heat sealing block 207 is in close contact with the outer side of the upper half box 205 of the material box, and the outer wall of the heat sealing block 207 is in close contact with the inner wall of the heat storage box body 203. The joints are all oil-sealed, so that when the upper half box 205 of the material box drives the heat storage box body 203 to move during the operation of the device, the internal space of the heat storage box 2 remains closed.

[0032] like Figure 7 As shown, bosses 2101 are provided on the three outer sides of the upper surface of the heat storage box base 210, and a positioning threaded through hole 2102 is provided on the top surface of the boss 2101. The positioning threaded through hole 2102 is connected to the positioning threaded hole 2083 at the bottom of the boss 2081 of the lower half box body 208 of the material box by screws, so that the heat storage box base 210 is connected and fixed to the lower half box body 208 of the material box. The flat heat pipe 3 is closely arranged in the area surrounded by the three-sided boss 2101, and it is ensured that the flat heat pipe 3 is in close contact with the heat storage box base 210 and the lower box body thermal conductive ceramic 209.

[0033] The loading rack 4 includes a loading platform 41, a bracket 42, a wire collection hole 43, and a battery 44. The upper surface of the loading platform 41 carries the assembly of the photovoltaic panel 1, the heat storage box 2, and the flat heat pipe 3. The lower surface of the loading platform 41 is fixedly connected to the bracket 42 by screws. The battery 44 is fixed in the middle of the lower surface of the loading platform 41. The loading platform 41 is provided with a wire collection hole 43, which is used to connect the wires of the photovoltaic panel 1 and the thermoelectric power generation sheet 204 and connect them to the battery 44 after being arranged by wire collection.

[0034] Several working conditions of the photovoltaic cooling and waste heat utilization device of the present invention are specifically as follows: Working condition 1: Operation of photovoltaic panels and heat recovery and conversion.

[0035] After receiving solar radiation during the day, the photovoltaic panel 1 converts solar energy into electrical energy using the photoelectric effect. The current generated by the photovoltaic panel is stored by connecting to the storage battery 44 through a wire. At the same time, the residual heat generated during the operation of the photovoltaic panel is quickly transferred to the upper box thermal conductive ceramic 202 through the copper thermal pad 201 to prevent the residual heat from accumulating under the photovoltaic panel and causing the temperature to rise, thereby affecting its working efficiency.

[0036] During this process, a tight thermal contact is formed between the photovoltaic panel 1, the copper heat-conducting pad 201, and the upper box body heat-conducting ceramic 202. The upper and lower surfaces of the copper heat-conducting pad 201 are bonded to the photovoltaic panel 1 and the upper box body heat-conducting ceramic 202 respectively through heat-conducting glue, ensuring that the waste heat can be efficiently conducted and preventing the waste heat from accumulating and damaging the photovoltaic panel 1. The upper box body heat-conducting ceramic 202 has good heat-conducting performance and a low coefficient of thermal expansion, and quickly and stably transfers the waste heat to the composite phase change material in the material box. These composite phase change materials absorb heat and undergo a phase change, thereby reducing the temperature of the photovoltaic panel.

[0037] Before the composite phase change materials undergo a complete phase change, they will continue to absorb the heat transferred from the photovoltaic panel 1 and the upper box body heat-conducting ceramic 202, further reducing the operating temperature of the photovoltaic panel 1 and maintaining it in an efficient operating state. At the same time, the heat dissipated into the enclosed space through the inner heat dissipation holes 2082 and the outer heat dissipation holes 2053 accumulates and forms a temperature difference with the external environment of the heat storage box 2, causing the thermoelectric generation sheet 204 to enter the operating state and consume the excess heat, assisting the composite phase change materials in cooling the photovoltaic panel 1. When the composite phase change materials undergo a complete phase change, the volume of the composite phase change materials expands, pushing the upper half box body 205 of the material box upward to produce a small movement, and then driving the heat storage box body 203 to displace upward.

[0038] After the composite phase change materials undergo a complete phase change, the excess heat will be transferred to the lower box body heat-conducting ceramic 209, and then transferred by the lower box body heat-conducting ceramic 209 to the flat heat pipe 3. The flat heat pipe 3 conducts the heat from the hot end to the cold end through its good heat-conducting performance. The cold end is located outside the heat storage box body 203, and the heat at the cold end is transferred to external equipment for further heat recovery or conversion into electrical energy, realizing the effective utilization of waste heat.

[0039] Operating condition 2: Heat release of the system and night operation.

[0040] At night or when the ambient temperature is relatively low, the photovoltaic panel 1 stops working and no longer generates waste heat. The composite phase change materials start to release the heat absorbed before. The temperature difference between the inside and outside of the heat storage box 2 increases, causing the thermoelectric generation sheet 204 to work, generating current through the thermoelectric effect and storing the electrical energy in the storage battery 44. This not only improves the power generation capacity of the system but also consumes the originally accumulated waste heat through the thermoelectric generation sheet 204, preventing the heat from flowing back inside the heat storage box 2 and increasing the operating stability of the device under low-temperature conditions.

[0041] During this process, the cold end of the flat heat pipe 3 can be connected to an external device that is generating waste heat, such as an industrial device or other heat source devices, so as to extend the duration of heat release of the composite phase change materials through heat exchange with the external device, improve the stability of the internal temperature of the heat storage box, and thus keep the thermoelectric generation sheet 204 within a certain operating temperature range.

[0042] Operating condition 3: Operation of the system in a cold environment.

[0043] In a cold environment, the power generation efficiency of the photovoltaic panel 1 decreases due to the low temperature. At this time, the waste heat generated by external equipment is transferred to the lower box body heat conduction ceramic 209 through the cold end of the flat heat pipe 3, and then the heat is transferred to the composite phase change material through the lower box body heat conduction ceramic 209. When the composite phase change material receives the heat transmitted from the external equipment, they will start to absorb and store the heat. After saturation, the heat released by the composite phase change material is transferred to the photovoltaic panel 1 through the upper box body heat conduction ceramic 202, providing a heating effect for the photovoltaic panel 1, alleviating the problem of too low temperature of the photovoltaic panel 1, thereby helping the photovoltaic panel 1 to recover to the normal working temperature and ensuring that the photovoltaic panel 1 can work normally in a cold environment.

[0044] In addition, part of the heat escapes through the outer heat dissipation holes 2053 and the inner heat dissipation holes 2082, which helps to further enhance the power generation efficiency of the thermoelectric generator 204 and improve the operating ability of the system in a cold environment.

[0045] The photovoltaic cooling and waste heat utilization device of the present invention can not only improve the power generation efficiency of the photovoltaic panel 1, but also effectively convert waste heat into available electric energy. Electric energy is generated by the thermoelectric generator 204 under the action of temperature difference and stored in the storage battery 44. When the sunlight is insufficient or the photovoltaic panel 1 stops working, the electric energy stored in the storage battery can be used for power supply or provide energy for external equipment. Through this device, diversified recovery and utilization of waste heat can be realized, greatly improving the energy use efficiency.

[0046] In summary, through the effective recovery and conversion of waste heat, this device can ensure the efficient operation of the photovoltaic panel while converting waste heat into electric energy or transferring it to external equipment through heat pipes for diversified utilization. Whether in the day, at night or in a cold environment, the system can maintain a relatively stable working state and maximize the power generation efficiency of the photovoltaic panel. Through modular design, the device of the present invention can be functionally expanded according to actual needs, with good flexibility and adaptability.

[0047] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A photovoltaic cooling and waste heat utilization device, characterized in that: It comprises a photovoltaic panel (1), a heat storage box (2), a flat heat pipe (3), and a loading rack (4); The heat storage box (2) comprises a copper heat conductive pad (201), an upper box body heat conductive ceramic (202), a heat storage box body (203), a temperature difference power generation sheet (204), an upper half box body (205) of a material box, a lower half box body (208) of a material box, a lower box body heat conductive ceramic (209), and a heat storage box base (210); The heat storage box body (203) is a hollow structure formed by side walls, and the photovoltaic panel (1) is fixed on the top of the heat storage box body (203); a plurality of temperature difference power generation sheets (204) for generating electricity by the temperature difference between the inside and outside of the heat storage box body (203) are respectively embedded in a group of opposite side walls of the heat storage box body (203); the upper half box body (205) of the material box is a hollow structure formed by side walls as a whole, and a plurality of heat dissipation holes are provided on the side walls; the upper box body heat conductive ceramic (202) is fixed on the top of the upper half box body (205) of the material box; the upper half box body (205) of the material box is fixed in the heat storage box body (203); the copper thermal conductive pad (201) is filled between the photovoltaic panel (1) and the upper box body heat conductive ceramic (202), and a thermal conductive glue is provided between the mutual connection surfaces; The lower half of the material box (208) is also located inside the heat storage box (203); the lower half of the material box (208) is a hollow structure formed by side walls, and a plurality of heat dissipation holes are provided on the side walls; the lower box heat conductive ceramic (209) is fixed to the bottom of the lower half of the material box (208), and a composite phase change material is provided in the formed material bin; the heat storage box base (210) is fixed to the bottom of the lower half of the material box (208), and a closely arranged flat heat pipe (3) is provided between the two; the flat heat pipe (3) extends from the bottom end of a side wall of the heat storage box (203) to the outside of the heat storage box (203), and the cold end is used to connect to an external device; The photovoltaic panel (1), the heat storage box (2), and the flat heat pipe (3) are assembled on a carrier (4), a storage battery (44) is arranged on the carrier (4), and the photovoltaic panel (1) and the temperature difference power generation sheet (204) are connected to the storage battery (44) via a wire.

2. The photovoltaic cooling and waste heat utilization device according to claim 1, characterized in that: The heat storage box (2) further comprises a compartment dividing plate (206) for dividing the material compartment into a plurality of small compartments, each small compartment being provided with the composite phase change material.

3. The photovoltaic cooling and waste heat utilization device according to claim 1, characterized in that: The number and positions of the heat dissipation holes on the side walls of the upper half box body (205) of the material box and the lower half box body (208) of the material box correspond to each other.

4. The photovoltaic cooling and waste heat utilization device according to claim 1, characterized in that: The lower half box body (208) of the material box is placed inside the upper half box body (205) of the material box, and the two are nested and can slide up and down relative to each other.

5. The photovoltaic cooling and waste heat utilization device according to claim 1, characterized in that: A groove (2035) is provided at the bottom end of a side wall of the heat storage box body (203); in the structure of the assembly, the flat heat pipe (3) is inserted through the groove (2035) and extends to the outside of the heat storage box body (203).

6. The photovoltaic cooling and waste heat utilization device according to claim 1, characterized in that: The composite phase change material is filled into a bag made of fluorosilicone and then placed in the material bin.

7. The photovoltaic cooling and waste heat utilization device according to claim 3, characterized in that: A gap is left between the upper half of the material box (205) and the heat storage box (203); a boss (2081) is provided on the outer side of the bottom end of the lower half of the material box (208), and the heat sealing block (207) is bonded to the boss (2081). A gap is left between the inner wall of the heat sealing block (207) and the outer wall of the lower half of the material box (208). The inner wall of the heat sealing block (207) is in close contact with the outer side of the upper half of the material box (205), and the outer wall of the heat sealing block (207) is in close contact with the inner wall of the heat storage box (203), and the joints are all oil-sealed.

8. The photovoltaic cooling and waste heat utilization device according to any one of claims 1 to 7, characterized in that: A concave platform corresponding to the shape of the photovoltaic panel (1) is provided on the inner side of the top of the heat storage box body (203); after the photovoltaic panel (1) is embedded, the periphery of the photovoltaic panel (1) is pressed tightly by an upper sealing frame (211) fixedly connected to the top of the heat storage box body (203).

9. The photovoltaic cooling and waste heat utilization device according to claim 7, characterized in that: A concave platform (2084) is provided near the inner side of the bottom surface of the boss (2081), the lower box thermal conductive ceramic (209) is bonded into the concave platform (2084), and the lower bottom surface of the lower box thermal conductive ceramic (209) is flush with the bottom surface of the boss (2081).

10. The photovoltaic cooling and waste heat utilization device according to any one of claims 1 to 7, characterized in that: The cold end of the flat heat pipe (3) is used to connect to an external heat collection device to recover excess heat after the composite phase change material has completely changed phase; or to connect to an external device that is generating waste heat to reversely input heat into the heat storage box (2) when the temperature of the photovoltaic panel (1) is lower than a set temperature.

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