Non-contact heat removal device of photovoltaic and photo-thermal integrated system

Abstract

The utility model relates to a non-contact heat removal device of a photovoltaic and photo-thermal integrated system, belongs to the technical field of heat collection equipment, and aims to solve the problems that an existing photovoltaic panel heat collector is inconvenient to install, can cause damage to a photovoltaic panel, needs external parts, and is low in heat conductivity, complex in structure, poor in product applicability and low in heat exchange efficiency. The heat collector comprises a heat collector box body and a heat collection assembly, a semi-closed cavity with an opening in one side is formed in the heat collector box body, the heat collector box body is installed on a heat source through the opening side, and a non-contact type convection heat exchange cavity is formed between the semi-closed cavity and the heat source; the heat collecting assembly comprises a heat collecting pipe and a circulating pump; the heat collecting pipe is installed in the convection heat exchange cavity, the two ends of the heat collecting pipe extend to the outer side of the heat collector box body to form an outlet and an inlet, a heat conducting medium is arranged in the heat collecting pipe, and the outlet and the inlet of the heat collecting pipe are connected with the circulating pump. According to the heat collection equipment, secondary machining of the photovoltaic panel is not needed, installation is convenient and fast, the product applicability is high, and the heat exchange efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of photovoltaic light heat integration system non-contact heat extraction device, belong to heat collecting equipment technical field. BACKGROUND

[0002] Photovoltaic power generation is a technology that converts light energy directly into electrical energy using the photovoltaic effect of the semiconductor interface. It is mainly composed of solar panels (i.e. photovoltaic panels), controllers and inverters, and the main components are made of electronic components. Solar cells can be connected in series and then encapsulated to form large-area solar cell modules. When combined with power controllers and other components, a photovoltaic power generation device is formed.

[0003] Solar photovoltaic panels convert solar energy into electrical energy through the photoelectric effect. During this process, the photovoltaic panels absorb solar energy and convert it into heat energy. Although most of the energy is converted into electrical energy, some of it is released as heat, causing the temperature of the photovoltaic panels and the surrounding environment to rise. The temperature rise of the photovoltaic panels has a significant impact on their power generation efficiency. The power generation efficiency of photovoltaic panels is closely related to temperature, and excessively high or low temperatures can cause the power generation efficiency to decrease. Specifically, the power generation efficiency of photovoltaic panels gradually decreases as the temperature rises. For every 1 degree Celsius increase in temperature, the output power decreases by 0.5% to 0.8%.

[0004] To control the temperature of photovoltaic panels, existing technology uses heat collectors to control the temperature of photovoltaic panels. However, existing photovoltaic panel heat collectors have some drawbacks, such as: 1. Existing heat collectors use a contact installation method, which requires secondary processing of photovoltaic panels or solar cells for integrated installation with the heat collector, which can cause damage to the photovoltaic panels or solar cells. 2. Existing laminated PV / T type heat collectors can cause the photovoltaic panel backboard or solar cells to peel off or crack due to the different expansion coefficients of the materials used in the heat collector. 3. Existing heat collectors require an external air circulation component to increase the circulation of air around the photovoltaic panels to improve heat transfer. However, the air circulation component requires an external power source, which increases costs and reduces energy efficiency. 4. Existing heat collectors have a complex structure, are easily damaged during storage and transportation, and have high costs. They have high customization levels, poor product applicability, and low heat exchange efficiency. 5. The liquid flow pipe of the existing heat collector directly contacts the photovoltaic panel, which can cause electrical shock safety hazards during use. Therefore, a non-contact heat extraction device for photovoltaic light heat integration systems is needed to solve the problems of existing photovoltaic panel heat collectors, such as inconvenient installation, damage to photovoltaic panels, the need for external components, low heat transfer, complex structure, poor product applicability, and low heat exchange efficiency. SUMMARY

[0005] The purpose of this invention is to provide a non-contact heat extraction device for a photovoltaic-thermal integrated system, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a non-contact heat extraction device for a photovoltaic-thermal integrated system, comprising a collector housing and a heat collection assembly. The collector housing has a semi-enclosed cavity with an opening on one side. The collector housing is installed on a heat source through the opening side, and a non-contact convection heat exchange cavity is formed between the semi-enclosed cavity and the heat source. The heat collection assembly includes a heat collection tube and a circulation pump. The heat collection tube is installed in the convection heat exchange cavity, and its two ends extend to the outside of the collector housing to form an outlet and an inlet, respectively. A heat-conducting medium is provided inside the heat collection tube, and the outlet and inlet of the heat collection tube are respectively connected to the circulation pump.

[0007] Specifically, the collector housing includes a front panel, a back panel, and a frame; the front panel and the back panel are fixedly installed as a whole in parallel; the frame is installed along the outside of the front panel and the back panel, and the three together form a semi-closed cavity housing structure with one side open; the collector housing is installed on the heat source through the front panel facing the heat source.

[0008] Specifically, the heat collection tube includes an inlet tube, an outlet tube, a connecting tube, and sub-collector tubes; the inlet tube and the outlet tube are open on one side and have a hollow internal structure, and the open ends of the inlet tube and the outlet tube extend to the outside of the box to form an outlet and an inlet; the tube bodies of the inlet tube, the outlet tube, and the connecting tube are provided with connection ports, and the connection ports on the tube bodies of the inlet tube and the outlet tube are connected to the connection ports of the connecting tubes through the sub-collector tubes respectively.

[0009] Specifically, the inlet pipe and outlet pipe are installed horizontally at intervals on the upper inner wall of the collector housing, with their single-sided open ends extending away from the heat source to the outer side of the collector housing; the connecting pipe is installed parallel to the inlet pipe and outlet pipe on the lower inner wall of the housing; and the sub-collector pipes are installed perpendicular to the inlet pipe, outlet pipe, and connecting pipe.

[0010] Specifically, the connecting pipe is a tubular structure that is closed at both ends and hollow inside; several connection ports are evenly distributed on the body of the inlet pipe and the outlet pipe; corresponding connection ports are opened on the body of the connecting pipe at positions corresponding to the connection ports of the inlet pipe and the outlet pipe; the connection ports of the inlet pipe and the outlet pipe and the connection ports on the connecting pipe are connected one-to-one through sub-collector pipes to form several heat collection pipes.

[0011] Specifically, heat-collecting fins are installed on the outside of the heat-collecting pipe; the heat-collecting fins include several sub-heat-collecting fins; the several sub-heat-collecting fins are evenly distributed at intervals along the circumference of the heat-collecting pipe. The connection method between the heat-collecting fins and the heat-collecting pipe in this application can be welding, riveting or integral molding as used in the prior art.

[0012] Specifically, the heat-conducting medium is any one of water, oil or a liquid with heat-conducting performance.

[0013] Specifically, a heat-insulating layer made of heat-insulating material is arranged between the front plate and the back plate.

[0014] Specifically, the back plate is a waterproof back plate made of waterproof material.

[0015] Specifically, waterproof strips are arranged at positions of the frame located at the opening side of the collector box.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] 1. The collector box with the internal semi-closed cavity is arranged to form a non-contact convection heat exchange cavity with the heat source when the collector box is installed on the back plate of the photovoltaic panel or other heat source. The collector box of the application is installed with a heat collecting pipe in the semi-closed cavity, and the two ends of the heat collecting pipe extend to the outside of the box to form an outlet and an inlet. The heat collecting pipe is connected with a circulating pump, and a heat-conducting medium is arranged in the heat collecting pipe to exchange heat generated by the photovoltaic panel or other heat source through convection heat exchange, and then the heat-conducting medium in the heat collecting pipe exchanges heat to collect and recycle the heat. The non-contact heat extraction device of the photovoltaic and light heat integrated system of the application does not need to process the photovoltaic panel twice, and will not damage the photovoltaic panel or the battery piece, and is easy to install. Since it is a non-contact heat exchange method, the heat collecting equipment of the application is not directly related to the photovoltaic module, so it does not need to be separately certified by the electric appliance KC / KS, greatly simplifying the access process, saving time and cost.

[0018] 2. On the basis of the foregoing, the collector box of the application comprises a front plate, a back plate and a frame. The front plate and the back plate are fixed and installed in parallel to form an integrated body. The frame is installed along the outside of the front plate and the back plate, and the three form a semi-closed cavity box structure with one side open. The collector box is installed on the heat source through the front plate facing the heat source. The modular design of the heat collecting equipment is suitable for rapid deployment, which can be easily used in new projects and installed on the photovoltaic module of existing projects, providing great convenience for engineering implementation, and has strong maintainability and simplified after-sales service. The collector box of the application adopts an independent exoskeleton structure, which makes the product more easily disassembled. When a part of the heat collecting equipment fails, the damaged part can be replaced without replacing the photovoltaic module, which greatly reduces the maintenance difficulty and improves the A / S management efficiency. The cost is fixed, and the price risk is low. After the collector box of the application is customized, the cost is basically fixed, and the fluctuation of the price of the photovoltaic module will not affect the cost of the PVT system, which brings higher economic stability to the user.

[0019] 3. On the basis of the foregoing, the non-contact heat extraction device of the photovoltaic and photothermal integrated system of the application adopts a non-contact convection heat exchange type heat exchange heat transfer mode for heat recovery. Compared with the existing laminated PV / T type collector, the photovoltaic panel back plate or the cell sheet will not be peeled off or cracked due to the different expansion coefficients of different materials, the structure is stable, and the service life is long.

[0020] 4. On the basis of the foregoing, the heat collecting pipe of the application comprises an inlet pipe, an outlet pipe, a connecting pipe and a sub heat collecting pipe; the inlet pipe and the outlet pipe are single-sided openings with a hollow structure inside, and the single-sided opening ends of the inlet pipe and the outlet pipe extend to the outside of the box to form an outlet and an inlet; the pipe body of the inlet pipe, the outlet pipe and the connecting pipe is provided with a connecting port, and the connecting ports on the pipe body of the inlet pipe and the outlet pipe are connected with the connecting port of the connecting pipe through the sub heat collecting pipe. To achieve heat exchange in the convection heat exchange cavity, heat is exchanged through the sub heat collecting pipe, and the heat is concentrated and discharged for recovery through the heat conducting medium in the inlet pipe and the outlet pipe, and the inlet pipe and the outlet pipe of the application are connected with the connecting pipe through the sub heat collecting pipe. The circulating pump is used to drive the heat conducting medium to circulate in the heat collecting pipe to realize continuous heat transfer. In addition, the heat collecting equipment of the application can realize the effect of gradually increasing temperature between the inlet pipe and the outlet pipe and between the upper side of the heat collector box and the lower side of the heat collector box, so as to improve the efficient recovery of heat energy. At the same time, a closed micro-space gas enhanced circulation effect is formed in the convection heat exchange cavity, without the need to additionally set up an air circulation assembly, so that an external power supply is not needed, thereby reducing the cost and improving the energy utilization rate.

[0021] 5. On the basis of the foregoing, the outer side of the sub heat collecting pipe is provided with heat collecting fins to improve the gas heat exchange efficiency. In order to ensure the effective concentration and recovery of heat energy, the application sets an insulation layer between the front plate and the back plate of the heat collector box to reduce the heat loss in the convection heat exchange cavity. The heat extraction equipment of the application is based on the gas-liquid heat exchange principle, and the heat energy output ratio can be customized according to the user's demand. The heat carried away can be controlled by controlling the rotating speed of the circulating pump to control the heat carried away by the photovoltaic system or other heat sources. The amount of heat transferred depends entirely on the actual use scene demand of the user, and is proportional to the cost of the user, precise and efficient. The non-contact gas-liquid heat exchanger heat collecting equipment of the application is suitable for solar energy, industrial waste heat recovery and other fields.

[0022] 6. On the basis of the foregoing, the back plate of the heat collector box is set as a waterproof back plate, and waterproof strips are arranged at the positions of the frame located on the opening side of the heat collector box to improve the waterproof performance of the heat collector box, so as to realize the outdoor waterproof performance of the heat collector, improve the sealing performance of the heat collector box, and also improve the environmental durability, prolong the service life. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an explosion schematic view of the structure of the non-contact heat extraction device of the photovoltaic and photo-thermal integrated system of the embodiment. DETAILED DESCRIPTION

[0024] In order to make the purpose and advantages of the utility model more clear and explicit, the utility model is specifically explained below in combination with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the utility model, and does not strictly limit the protection scope of the utility model specifically requested.

[0025] Please refer to Figure 1 The embodiment discloses a non-contact heat extraction device of a photovoltaic and photo-thermal integrated system, which comprises a heat collector box body and a heat collection assembly. A semi-closed cavity with one open side is arranged inside the heat collector box body. The heat collector box body is installed on the back of a photovoltaic panel through the open side. A non-contact convection heat exchange cavity is formed between the semi-closed cavity and the photovoltaic panel. The heat collection assembly comprises a heat collection pipe 1 and a circulating pump (not shown in the figure). The heat collection pipe is installed in the convection heat exchange cavity and extends to the outside of the heat collector box body at both ends to form an outlet 2 and an inlet 20 respectively. A heat conducting medium is arranged in the heat collection pipe. The heat conducting medium of the embodiment is water. The outlet and the inlet of the heat collection pipe are connected with the circulating pump respectively.

[0026] The heat collector box body of the embodiment is of a rectangular structure, which comprises a front plate 4, a back plate 7 and a frame 5. The front plate and the back plate are fixedly installed in parallel and integrated. The frame 5 of the embodiment comprises an upper frame, a lower frame, a left frame and a right frame. The upper frame, the lower frame, the left frame and the right frame are installed along the outside of the front plate and the back plate. Adjacent two frames are connected through a frame corner code 8. The frame, the front plate and the back plate enclose a rectangular box structure with a semi-closed cavity inside. The heat collector box body is installed on the back of the photovoltaic panel through the front plate towards the direction of the photovoltaic panel. In addition, the front plate and the back plate of the embodiment are provided with a heat preservation layer 6 made of heat preservation material. The upper frame, the lower frame, the left frame and the right frame are respectively provided with waterproof strips 9 at the positions of the open side of the heat collector box body.

[0027] The heat collection pipe 1 of the embodiment comprises an inlet pipe 10, an outlet pipe 11, a connecting pipe 12 and a sub heat collection pipe 13. The inlet pipe 10 and the outlet pipe 11 are single-sided open and hollow inside. The single-sided open ends of the inlet pipe and the outlet pipe extend to the outside of the box to form the outlet 2 and the inlet 20. Connection openings are formed on the pipe bodies of the inlet pipe 10, the outlet pipe 11 and the connecting pipe 12. The connection openings on the pipe bodies of the inlet pipe and the outlet pipe are connected with the connection openings of the connecting pipe through the sub heat collection pipe 13 respectively.

[0028] Furthermore, in this embodiment, the inlet pipe 10 and the outlet pipe 11 are installed horizontally at intervals on the upper inner wall of the collector housing, with their single-sided open ends extending away from the heat source to the outer side of the collector housing; the connecting pipe 12 is installed parallel to the inlet pipe and the outlet pipe on the lower inner wall of the housing; the sub-collector pipes 13 are installed perpendicular to the inlet pipe, the outlet pipe, and the connecting pipe. In this embodiment, the connecting pipe 12 is a tubular structure with closed ends and a hollow interior; three connection ports are evenly distributed on the pipe body of the inlet pipe and the outlet pipe; corresponding connection ports are respectively opened on the pipe body of the connecting pipe at positions corresponding to the connection ports of the inlet pipe and the outlet pipe; the connection ports of the inlet pipe and the outlet pipe and the connection ports on the connecting pipe are connected one-to-one through the sub-collector pipes to form six collector pipes.

[0029] In addition, heat collecting fins 3 are sleeved on the outside of the heat collecting pipe in this embodiment. The heat collecting fins in this embodiment include several sub-heat collecting fins; the several sub-heat collecting fins are evenly distributed at intervals along the circumference of the heat collecting pipe.

[0030] Working Principle: The photovoltaic-thermal integrated system non-contact heat extraction device in this embodiment, based on the specifications and dimensions of the photovoltaic panels of the user's photovoltaic modules, first processes and manufactures the components of the collector housing. After component processing, the heat collection pipes are installed inside the collector housing, and then the assembled heat collection equipment is installed on the back of the photovoltaic panel. Finally, the outlet and inlet of the heat collection pipes are connected to the circulation pump via connecting pipes and connected to a water tank. During use, the user can adjust the speed of the circulation pump according to the ambient temperature to control the circulation speed of the circulating water, thereby controlling the removal of heat energy from the photovoltaic panel and thus controlling the temperature of the photovoltaic panel. During heat exchange, the temperature of the photovoltaic panel itself and the surrounding environment rises with the increase of sunshine hours. Heat energy enters the convection heat exchange cavity, causing the temperature inside the semi-enclosed cavity of the collector housing to rise. Because the back panel of the collector housing has an insulation layer, the heat inside the collector housing does not escape, achieving a heat preservation effect. As the temperature rises, when the temperature inside the semi-enclosed cavity reaches and exceeds the temperature of the circulating water inside the collector tubes, heat energy is transferred through the collector fins to the sub-collector tubes and ultimately conducted to the circulating water, flowing out of the collector housing driven by the circulation pump. It is important to note that the water temperature at the inlet side of the collector tubes is lower than the water temperature at the outlet side. With increased usage time, the temperature of the six sub-collector tubes gradually increases along the inlet pipe towards the outlet pipe and along the upper side of the collector housing towards the lower side. This results in a temperature distribution within the enclosed cavity where the gas temperature around the sub-collector tubes is lower at the inlet side than at the outlet side, and lower on the upper side of the collector housing than on the lower side. This creates an annular gas flow channel within the semi-enclosed cavity, where gas flows automatically from the outlet side to the inlet side and from the upper side of the collector housing towards the lower side. Ultimately, this forms a gas circulation loop within the collector housing cavity, further enhancing heat exchange efficiency.

[0031] As the circulating water takes out the heat energy of the photovoltaic panel and the surrounding environment, the user can set the application facility according to the own demand to apply the taken-out heat energy. The non-contact heat taking device of the photovoltaic and light heat integrated system of the embodiment solves the problems of weight increase, storage and transportation inconvenience, electric shock safety and installation complexity caused by directly adding the heat exchange device to the photovoltaic panel in the prior art. The device has the advantages of convenient installation, high heat exchange efficiency, good safety and wide applicability, and can be widely applied to the fields of solar energy and industrial waste heat recovery.

[0032] The embodiment of the utility model is described in detail above, but the utility model is not limited to the above-mentioned embodiment. For ordinary skilled in the art, after knowing the content recorded in the utility model, without departing from the principle of the utility model, some equivalent transformations and substitutions can be made, which should also be considered as belonging to the protection scope of the utility model.

Claims

1. A non-contact heat extraction device for a photovoltaic-photothermal integrated system, comprising a heat collector box and a heat collection assembly, characterized in that: The heat collector box is internally provided with a semi-closed cavity with one side opening, and the heat collector box is installed on the heat source through the opening side, and a non-contact convection heat exchange cavity is formed between the semi-closed cavity and the heat source; the heat collecting assembly comprises a heat collecting pipe and a circulating pump; the heat collecting pipe is installed in the convection heat exchange cavity, and both ends of the heat collecting pipe extend to the outside of the heat collector box to form an outlet and an inlet, respectively, and the heat collecting pipe is internally provided with a heat conducting medium, and the outlet and the inlet of the heat collecting pipe are connected with the circulating pump, respectively.

2. The non-contact heat extraction device of a photovoltaic-photo thermal integrated system according to claim 1, characterized in that: The heat collector box comprises a front plate, a back plate and a frame; the front plate and the back plate are fixedly installed in parallel and integrated; the frame is installed along the outer sides of the front plate and the back plate, and the three form a box structure of a semi-closed cavity with one side opening; the heat collector box is installed on the heat source through the front plate towards the heat source.

3. The non-contact heat extraction device of a photovoltaic-photo thermal integrated system according to claim 1, characterized in that: The heat collecting pipe comprises an inlet pipe, an outlet pipe, a connecting pipe and a sub heat collecting pipe; the inlet pipe and the outlet pipe are single-sided opening and hollow inside, and the single-sided opening ends of the inlet pipe and the outlet pipe extend to the outside of the box to form the outlet and the inlet; the pipe bodies of the inlet pipe, the outlet pipe and the connecting pipe are provided with connecting ports, and the connecting ports on the pipe bodies of the inlet pipe and the outlet pipe are connected with the connecting ports of the connecting pipe through the sub heat collecting pipe.

4. The non-contact heat extraction device of a photovoltaic and photo-thermal integrated system according to claim 3, characterized in that: The inlet pipe and the outlet pipe are installed on the upper inner wall of the heat collector box in a horizontal direction, and the single-sided opening ends thereof extend to the outside of the heat collector box away from the heat source; the connecting pipe is installed on the lower inner wall of the box in parallel with the inlet pipe and the outlet pipe; the sub heat collecting pipe is installed perpendicularly to the inlet pipe, the outlet pipe and the connecting pipe.

5. The non-contact heat extraction device of a photovoltaic and photo-thermal integrated system according to claim 3, characterized in that: The connecting pipe is a tubular structure with both ends closed and hollow inside; the pipe bodies of the inlet pipe and the outlet pipe are provided with a plurality of connecting ports which are uniformly distributed at intervals; the pipe body of the connecting pipe is provided with a corresponding connecting port at a position corresponding to the connecting ports of the inlet pipe and the outlet pipe; the connecting ports of the inlet pipe and the outlet pipe and the connecting ports on the connecting pipe are connected one by one through the sub heat collecting pipe to form a plurality of heat collecting pipelines.

6. The non-contact heat extraction device of a photovoltaic-photo thermal integrated system according to claim 5, characterized in that: The heat collecting fin is installed on the outside of the heat collecting pipeline; the heat collecting fin comprises a plurality of sub heat collecting fins; the plurality of sub heat collecting fins are arranged at intervals and uniformly distributed along the circumference of the heat collecting pipeline.

7. The non-contact heat extraction device of a photovoltaic-photo thermal integrated system according to claim 1, wherein: The heat conducting medium is any one of water, oil or a liquid with heat conducting property.

8. The non-contact heat extraction device of a photovoltaic-photo thermal integrated system according to claim 2, wherein: The front plate and the back plate are provided with a heat preservation layer made of heat preservation material therebetween.

9. The non-contact heat extraction device of a photovoltaic-photo thermal integrated system according to claim 2, wherein: The back plate is a waterproof back plate made of waterproof material.

10. The non-contact heat extraction device of a photovoltaic-photo thermal integrated system according to claim 2, wherein: The frame is provided with a waterproof strip at a position on the opening side of the heat collector box.

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