Waste heat utilization device for photovoltaic module and photovoltaic system

Abstract

The utility model provides a photovoltaic module waste heat utilization device and a photovoltaic system, relates to the photovoltaic technology field, the waste heat utilization device comprises a support plate and a heat exchange tube, the support plate is wave-shaped, the cross section of the wave crest and the wave trough of the support plate is trapezoid, the top of the support plate is used for supporting and fixing the photovoltaic module, and the heat exchange tube is arranged on the support plate. The photovoltaic modules and the supporting plates are obliquely arranged on the roof, wave crests or wave troughs of the supporting plates form heat dissipation channels, the heat exchange pipes are distributed in the heat dissipation channels at equal intervals, heat exchange media are arranged in the heat exchange pipes, and the heat exchange pipes are connected with the driving device. The driving device drives the heat exchange medium to move from the top to the bottom of the supporting plate in the length direction of the supporting plate. According to the waste heat utilization device for the photovoltaic module, the problem that a device which is adjustable in heat dissipation effect, capable of effectively utilizing heat of a photovoltaic panel and capable of improving photovoltaic power generation efficiency does not exist in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a waste heat utilization device and photovoltaic system for photovoltaic modules. Background Technology

[0002] Photovoltaic power generation is a technology that directly converts light energy into electrical energy using the photovoltaic effect at semiconductor interfaces. It mainly consists of three parts: solar panels, controllers, and inverters, with the main components being electronic devices. Due to the current demand for energy-saving renovations of steel buildings, photovoltaic panels need to be installed on the corrugated steel roofs of most single-story steel-structure buildings.

[0003] During use, some of the solar energy that is not converted into electrical energy is converted into heat energy by solar photovoltaic panels. In addition, there is resistance in the circuits and connectors of the photovoltaic panels. When current continues to pass through these resistors, some electrical energy will be converted into heat energy, causing the solar photovoltaic panels to heat up. Overheating of the photovoltaic panels can lead to a decrease in performance or damage.

[0004] Therefore, existing photovoltaic (PV) panels typically have heat dissipation devices to cool them. These devices usually use support plates to hold the PV panels in place, with channels created on the plates for heat dissipation. However, the effectiveness of this method depends heavily on the external environment; strong winds result in better cooling. Furthermore, this method cannot effectively utilize the heat generated by the PV panels and does not contribute to building energy efficiency improvements. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide a waste heat utilization device for photovoltaic modules, aiming to solve the problem in the prior art of lacking a waste heat utilization device with adjustable heat dissipation effect and effective utilization of photovoltaic panel heat.

[0006] The waste heat utilization device for photovoltaic modules proposed in this utility model includes a support plate and heat exchange tubes. The support plate is wavy, and the cross-section of the crests and troughs of the support plate is trapezoidal. The top of the support plate is used to support and fix the photovoltaic module so that the photovoltaic module and the support plate are inclinedly installed on the roof. The crests or troughs of the support plate form heat dissipation channels. Multiple heat exchange tubes are equidistantly distributed in the heat dissipation channels. Each heat exchange tube contains a heat exchange medium. The heat exchange tube is connected to a driving device, which drives the heat exchange medium to move along the length of the support plate from the top to the bottom.

[0007] The aforementioned waste heat recovery device for photovoltaic modules utilizes a support plate with a wave-shaped design to support the photovoltaic module, creating multiple heat dissipation channels. The heat generated by the photovoltaic module dissipates outwards and is transferred to the support plate through contact. Heat exchange tubes are installed within these channels, and a driving device continuously circulates the heat exchange medium within these tubes, carrying away heat and thus cooling the photovoltaic module. After absorbing heat, the heat exchange medium can transfer it to the desired equipment, achieving heat recovery from the photovoltaic module. Furthermore, since hot air in the heat exchange tubes typically rises, adjusting the heat exchange medium to move downwards in opposition to the hot air further enhances the heat absorption effect. The flow rate and weight of the heat exchange medium can be adjusted to regulate the heat absorption effect of the heat exchange tubes. Moreover, the adjustable heat dissipation effect ensures the optimal normal operation of the photovoltaic module, thereby improving photovoltaic power generation efficiency. Therefore, this invention solves the problem of the lack of a waste heat recovery device with adjustable heat dissipation that effectively utilizes the heat from photovoltaic panels and improves photovoltaic power generation efficiency.

[0008] In addition, the waste heat recovery device for photovoltaic modules proposed in this utility model may also have the following additional technical features:

[0009] Preferably, the waste heat utilization device further includes a recovery component, which is disposed below the lowest support plate. The recovery component includes a recovery pipe and a diversion pipe. The diversion pipe is sleeved on the outside of the trough of the support plate and is used to guide the heat exchange medium between the trough of the support plate and the photovoltaic module into the recovery pipe. The recovery pipe is sleeved on the outside of the heat exchange pipe and the diversion pipe and is used to guide the heat exchange medium in the diversion pipe and the heat exchange pipe to the storage device.

[0010] Preferably, the cross-section of the drainage pipe is trapezoidal and the cross-sectional area of ​​the drainage pipe gradually decreases from the side closest to the support plate to the other side.

[0011] Preferably, a connecting plate is provided at the bottom of the crest of the support plate, and the two ends of the connecting plate are connected to the trough of the support plate to support the heat exchange tube located at the trough.

[0012] Preferably, an auxiliary heat dissipation component is provided on the outside of the heat exchange tube. The auxiliary heat dissipation component includes a plurality of heat dissipation fins distributed circumferentially around the axis of the heat exchange tube. The plurality of auxiliary heat dissipation components are equidistantly distributed along the length of the heat exchange tube, and the heat dissipation component at the trough is located on the connecting plate.

[0013] Preferably, the heat dissipation component further includes a connecting ring sleeved on the outside of the heat exchange tube, a plurality of heat dissipation fins are inclinedly arranged on the connecting ring at the same angle, and the heat exchange tube is provided with a groove adapted to the connecting ring so that the connecting ring is rotatably connected to the heat exchange tube.

[0014] Preferably, the recovery pipe includes a circular pipe section and a tapered pipe section disposed at one end of the circular pipe section. The tapered pipe section is sleeved on the outside of the heat exchange pipe and the drainage pipe, and the cross-sectional area of ​​the tapered pipe section gradually decreases from the side closer to the drainage pipe to the other side.

[0015] Preferably, the system further includes a waterproof cover plate, wherein the outer contour dimension of the photovoltaic module is smaller than that of the support plate, and the waterproof cover plate is located on the support plate of two adjacent photovoltaic modules.

[0016] Preferably, a temperature sensor is provided at the bottom of the crest of the support plate, and multiple temperature sensors are evenly distributed on the support plate.

[0017] In addition, this utility model also provides a photovoltaic system, which includes multiple photovoltaic modules and multiple waste heat recovery devices as described above. The waste heat recovery devices are arranged below the photovoltaic modules and are used to recover waste heat from the photovoltaic modules in the same row. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the hidden recovery component of the waste heat utilization device for photovoltaic modules proposed in one embodiment of the present invention.

[0019] Figure 2 This is a partial structural schematic diagram of a waste heat recovery device for photovoltaic modules proposed in one embodiment of the present invention;

[0020] Figure 3 for Figure 2 A magnified view of a portion at point A;

[0021] Figure 4 This is a partial assembly diagram of the support plate, heat exchange pipe, and heat dissipation components in one embodiment of the present invention.

[0022] Figure 5 This is a partial assembly diagram of the support plate, heat exchange pipe, and heat dissipation components in one embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the back of a support plate equipped with a temperature sensor according to one embodiment of the present invention.

[0024] Explanation of key component symbols:

[0025] support plate 10 heat exchange tubes 20 Heat dissipation channel 30 Recycled components 40 Recycling Pipes 41 Drainage pipe 42 Connecting plate 11 Auxiliary heat dissipation components 50 heat sink 51 Connecting ring 52 Round tube section 411 tapered tube section 412 Waterproof cover 60 Temperature sensor 70 Photovoltaic modules 80

[0026] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0028] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Please see Figures 1 to 6 The image shows a waste heat utilization device for a photovoltaic module 80 according to an embodiment of the present invention, comprising a support plate 10 and a heat exchange pipe 20, wherein:

[0031] The support plate 10 is wavy, and the cross-section of the crests and troughs of the support plate 10 is trapezoidal. The top of the support plate 10 is used to support and fix the photovoltaic module 80 so that the photovoltaic module 80 and the support plate 10 are installed at an angle on the roof. The crests or troughs of the support plate 10 form heat dissipation channels 30. Multiple heat exchange pipes 20 are equidistantly distributed in the heat dissipation channels 30. The heat exchange pipes 20 are filled with heat exchange medium. The heat exchange pipes 20 are connected to the driving device. The driving device drives the heat exchange medium to move from the top to the bottom of the support plate 10 along the length direction of the support plate 10.

[0032] Understandably, by setting up a support plate 10 to support the photovoltaic module 80, and the support plate 10 being wavy, multiple heat dissipation channels 30 are formed on the support plate 10. The heat generated by the operation of the photovoltaic module 80 is dissipated to the surroundings and transferred to the support plate 10 through contact. Heat exchange pipes 20 are installed within the heat dissipation channels 30. A driving device drives the heat exchange medium within the heat exchange pipes 20 to continuously flow, thereby carrying away the heat within the heat exchange pipes 20 and achieving heat dissipation for the photovoltaic module 80. After absorbing heat, the heat exchange medium can transfer the heat to the required equipment, thus realizing the recovery and utilization of heat from the photovoltaic module 80. Furthermore, since the hot air within the heat exchange pipes 20 typically rises, adjusting the heat exchange medium to move downwards in opposition to the hot air further improves the heat absorption effect of the photovoltaic module 80. The flow rate and weight of the heat exchange medium can also be adjusted to adjust the heat absorption effect of the heat exchange pipes 20. In addition, the adjustable heat dissipation effect ensures the normal operation of the photovoltaic module 80 to the maximum extent, thereby improving photovoltaic power generation efficiency. Therefore, this utility model solves the problem in the prior art of lacking a waste heat utilization device with adjustable heat dissipation effect that can effectively utilize the heat of photovoltaic panels and improve the efficiency of photovoltaic power generation.

[0033] It should be noted that water is typically used as the heat exchange medium. The water absorbs the heat dissipated by the photovoltaic module 80 and also dissipates heat from the photovoltaic module 80. The heated water can be recycled, for example, by introducing a lithium bromide chiller unit to preheat the water, improving the efficiency of solar energy utilization, better achieving building energy conservation, and reducing power generation losses caused by excessively high temperatures in the photovoltaic power generation system. Alternatively, air can be used as the heat dissipation medium. In winter, cold outside air is introduced into the heat exchange pipe 20, and the air that has absorbed heat is then introduced into the building interior through a duct fan, improving indoor comfort, reducing air conditioning energy consumption, and achieving building energy conservation—a multi-benefit approach. Furthermore, in specific implementation, temperature sensors 70 are installed at the bottom of the crests of the support plate 10, with multiple temperature sensors 70 evenly distributed on the support plate 10. The driving device can be a variable frequency water pump, which can adjust the pump speed according to the temperature. For example, the normal pump speed is level 1; when the target temperature of temperature sensor 70 is 35 degrees Celsius, the pump speed increases to level 2; when the target temperature of temperature sensor 70 is 45 degrees Celsius, the pump speed increases to level 3, thereby adjusting the heat dissipation effect to regulate the photovoltaic panel temperature. Furthermore, the sensor can transmit its detection information to the central processing unit of the system via wireless communication methods such as Wi-Fi, Bluetooth, infrared, and radio frequency, allowing the central processing unit to adjust the water pump based on the sensor information. The sensor can be powered by its own power supply or by an external power supply. When powered by an external power supply, a through hole can be made in the support plate 10 to connect the sensor to the photovoltaic module 80 via a wire, utilizing the electricity generated by the photovoltaic power generation of the photovoltaic module 80 for operation.

[0034] As an example, and not a limitation, in some optional embodiments, the waste heat recovery device further includes a recovery component 40, which is disposed below the lowest support plate 10. The recovery component 40 includes a recovery pipe 41 and a drainage pipe 42. The drainage pipe 42 is fitted outside the trough of the support plate 10 to guide the heat exchange medium between the trough of the support plate 10 and the photovoltaic module into the recovery pipe 41. The recovery pipe 41 is fitted outside the heat exchange pipe 20 and the drainage pipe 42 to guide the heat exchange medium within the drainage pipe 42 and the heat exchange pipe 20 to a storage device. In specific implementations, multiple photovoltaic modules 80 are typically sequentially spliced ​​and tilted on a corrugated steel roof. The waste heat recovery device is used to dissipate heat from the photovoltaic modules 80 in the same row. When water is used as the heat exchange medium, the recovery component 40 can be used to collect rainwater falling onto the photovoltaic modules 80 and recycle it as a heat exchange medium. Furthermore, depending on the requirements, a filtration device can be installed to filter the water so that it can be used for other purposes.

[0035] Furthermore, the cross-section of the drainage pipe 42 is trapezoidal, and the cross-sectional area of ​​the drainage pipe 42 gradually decreases from the side closest to the support plate 10 to the other side. By setting the drainage pipe 42 with a gradually changing volume, water is diverted to adjust the flow rate and direction, so that the water is quickly collected and flows into the recovery pipe 41.

[0036] Furthermore, the recycling pipe 41 includes a circular pipe section 411 and a tapered pipe section 412 disposed at one end of the circular pipe section 411. The tapered pipe section 412 is sleeved on the outside of the heat exchange pipe 20 and the drainage pipe 42, and the cross-sectional area of ​​the tapered pipe section 412 gradually decreases from the side closest to the drainage pipe 42 to the other side. By providing a relatively large tapered pipe section 412, the recycling pipe 41 can be sleeved on the outside of the drainage pipe 42 and the heat exchange pipe 20, thereby collecting water inside the heat exchange pipe 20 and water that falls on the photovoltaic module 80 during rainy days, thus realizing the recycling of water resources. In addition, the tapered pipe section 412 of the recycling pipe 41 can be connected to the drainage pipe 42 and the heat exchange pipe 20 by welding, gluing, or by setting connectors to achieve the connection and fixation of the recycling assembly 40.

[0037] Specifically, a connecting plate 11 is provided at the bottom of the crest of the support plate 10. The two ends of the connecting plate 11 are connected to the troughs of the support plate 10 to support the heat exchange pipe 20 located at the trough. By setting the connecting plate 11, the structural strength of the support plate 10 is strengthened to improve the wind resistance of the photovoltaic module 80, and the heat exchange pipe 20 can also be supported and fixed, so that the heat exchange pipe 20 can also be set at the trough of the support plate 10 to improve the heat recovery efficiency of the photovoltaic module 80.

[0038] Additionally, an auxiliary heat dissipation component 50 is provided on the outside of the heat exchange pipe 20. This auxiliary heat dissipation component 50 includes multiple heat sinks 51 circumferentially distributed around the axis of the heat exchange pipe 20. These auxiliary heat dissipation components 50 are equidistantly distributed along the length of the heat exchange pipe 20, with the heat dissipation components at the troughs located on the connecting plate 11. In specific implementations, the support plate 10 and the heat exchange pipe 20 can be made of metal to improve heat conduction efficiency and accelerate the heat dissipation effect of the photovoltaic panel. Furthermore, by setting the auxiliary heat dissipation component 50 and using the heat sinks 51 in the heat dissipation section, the contact area with the thermal space at the photovoltaic module 80 is increased, thereby improving heat dissipation efficiency. Moreover, by reasonably adjusting the size of the heat sinks 51, direct contact between the heat sinks 51 and the support plate 10 can be achieved. By using metal components with good thermal conductivity, direct contact further improves the heat dissipation effect.

[0039] By way of example, and not limitation, in some optional embodiments, the heat dissipation component further includes a connecting ring 52 sleeved on the outside of the heat exchange tube 20. Multiple heat sinks 51 are inclined at the same angle on the connecting ring 52. The heat exchange tube 20 has a groove adapted to the connecting ring 52, allowing the connecting ring 52 to be rotatably connected to the heat exchange tube 20. Furthermore, the heat dissipation component may also include a connecting ring 52. By arranging the heat sinks 51 inclined in the same direction on the connecting ring 52, and rotatably connecting the connecting ring 52 to the heat exchange tube 20 through the groove, the connecting ring 52 and the heat sinks 51 form a fan. This allows the hot air to flow through the heat dissipation channel 30, accelerating airflow efficiency and improving heat dissipation.

[0040] Additionally, a waterproof cover plate 60 is included. The outer contour dimension of the photovoltaic module 80 is smaller than that of the support plate 10, and the waterproof cover plate 60 is located on the support plates 10 of two adjacent photovoltaic modules 80. By setting the waterproof cover plate 60, a waterproof layer is formed on the top of the photovoltaic module 80, thereby increasing the waterproof effect of the roof. Furthermore, the waterproof cover plate 60 can be composed of a waterproof and breathable membrane sandwiched between connecting plates 11, so that the waterproof cover plate 60 is both waterproof and allows air circulation, thereby improving the heat dissipation effect of the photovoltaic module 80.

[0041] In summary, the waste heat recovery device for the photovoltaic module 80 in the above embodiments of this utility model uses a support plate 10 to support the photovoltaic module 80. The support plate 10 is wavy, forming multiple heat dissipation channels 30. The heat generated by the photovoltaic module 80 during operation is dissipated to the surroundings and transferred to the support plate 10 through contact. A heat exchange tube 20 is installed in the heat dissipation channel 30. A driving device drives the heat exchange medium in the heat exchange tube 20 to flow continuously, thereby carrying away the heat in the heat exchange tube 20 and achieving heat dissipation for the photovoltaic module 80. After absorbing heat, the heat exchange medium can transfer the heat to the required equipment, thus realizing the recovery and utilization of the heat from the photovoltaic module 80. In addition, since the hot air in the heat exchange tube 20 usually moves upward, adjusting the heat exchange medium to move downward and opposite to the hot air further improves the heat absorption effect of the photovoltaic module 80. The flow rate and weight of the heat exchange medium can be adjusted to adjust the heat absorption effect of the heat exchange tube 20. Furthermore, the adjustable heat dissipation effect ensures the normal operation of the photovoltaic module 80 to the greatest extent, thereby improving the photovoltaic power generation efficiency. Therefore, this invention solves the problem in the prior art of lacking a waste heat utilization device with adjustable heat dissipation effect that can effectively utilize the heat of the photovoltaic panel and improve the photovoltaic power generation efficiency.

[0042] In addition, this utility model also proposes a photovoltaic system, including multiple photovoltaic modules 80 and multiple waste heat recovery devices as described in the above embodiments. The waste heat recovery devices are arranged below the photovoltaic modules 80 and are used to recover waste heat from the photovoltaic modules 80 in the same row.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A waste heat recovery device for photovoltaic modules, characterized in that, The device includes a support plate and heat exchange tubes. The support plate is wavy, with trapezoidal cross-sections at its crests and troughs. The top of the support plate is used to support and fix a photovoltaic module, allowing the photovoltaic module and the support plate to be installed at an angle on the roof. The crests or troughs of the support plate form heat dissipation channels. Multiple heat exchange tubes are equidistantly distributed within the heat dissipation channels, and each heat exchange tube contains a heat exchange medium. The heat exchange tubes are connected to a driving device, which drives the heat exchange medium to move along the length of the support plate from the top to the bottom.

2. The waste heat recovery device for photovoltaic modules according to claim 1, characterized in that, The waste heat utilization device also includes a recovery component, which is located below the lowest support plate. The recovery component includes a recovery pipe and a diversion pipe. The diversion pipe is sleeved on the outside of the trough of the support plate and is used to guide the heat exchange medium between the trough of the support plate and the photovoltaic module into the recovery pipe. The recovery pipe is sleeved on the outside of the heat exchange pipe and the diversion pipe and is used to guide the heat exchange medium in the diversion pipe and the heat exchange pipe to the storage device.

3. The waste heat recovery device for photovoltaic modules according to claim 2, characterized in that, The cross-section of the drainage pipe is trapezoidal, and the cross-sectional area of ​​the drainage pipe gradually decreases from the side closest to the support plate to the other side.

4. The waste heat recovery device for photovoltaic modules according to any one of claims 1 to 3, characterized in that, The support plate has a connecting plate at the bottom of the crest, and the two ends of the connecting plate are connected to the trough of the support plate to support the heat exchange tube located at the trough.

5. The waste heat recovery device for photovoltaic modules according to claim 4, characterized in that, An auxiliary heat dissipation component is provided on the outside of the heat exchange tube. The auxiliary heat dissipation component includes a plurality of heat dissipation fins distributed circumferentially around the axis of the heat exchange tube. The plurality of auxiliary heat dissipation components are equidistantly distributed along the length of the heat exchange tube, and the heat dissipation components at the troughs are located on the connecting plate.

6. The waste heat recovery device for photovoltaic modules according to claim 5, characterized in that, The heat dissipation component also includes a connecting ring sleeved on the outside of the heat exchange tube, and a plurality of heat dissipation fins are inclinedly arranged on the connecting ring at the same angle. The heat exchange tube is provided with a groove adapted to the connecting ring so that the connecting ring is rotatably connected to the heat exchange tube.

7. The waste heat recovery device for photovoltaic modules according to claim 3, characterized in that, The recovery pipe includes a circular pipe section and a tapered pipe section disposed at one end of the circular pipe section. The tapered pipe section is sleeved on the outside of the heat exchange pipe and the drainage pipe. The cross-sectional area of ​​the tapered pipe section gradually decreases from the side closest to the drainage pipe to the other side.

8. The waste heat recovery device for photovoltaic modules according to claim 1, characterized in that, It also includes a waterproof cover plate, wherein the outer contour dimension of the photovoltaic module is smaller than that of the support plate, and the waterproof cover plate is located on the support plate of two adjacent photovoltaic modules.

9. The waste heat recovery device for photovoltaic modules according to claim 1, characterized in that, Temperature sensors are provided at the bottom of the wave crests of the support plate, and multiple temperature sensors are evenly distributed on the support plate.

10. A photovoltaic system, characterized in that, It includes multiple photovoltaic modules and multiple waste heat recovery devices as described in any one of claims 1 to 9, wherein the waste heat recovery devices are disposed below the photovoltaic modules for recovering waste heat from the photovoltaic modules in the same row.

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