Synergistic device of photovoltaic temperature difference hybrid power generation system
By using cooling components of flat plate heat pipes and thermally conductive aluminum plates in photovoltaic temperature difference hybrid power generation system, the problem of low output power output of temperature difference power generation modules in the prior art is solved, and a higher maximum power of photovoltaic cells and the output power of temperature difference power generation modules are achieved. in various environments.
Patent Information
- Application Number
- CN202323469308.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-19
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-19
AI Technical Summary
The existing photovoltaic temperature-differential hybrid power generation system lacks efficiency-enhancing devices with high applicability and low operation and maintenance costs, resulting in a low output power of the temperature-differential power generation module, and a liquid cooling solution is not feasible in the environment of lack of water resources.
The cooling components including flat plate heat pipe parts and thermally conductive aluminum plates are adopted to transfer the heat of the photovoltaic cell panel to the hot end of the temperature differential power generation module through heat conduction, and a porous liquid absorption structure and steam cavity are set up at the cold end to increase the heat dissipation capacity of the cold end and use the aluminum plate. Enhance the connection and heat exchange area, and improve the cold-end heat dissipation effect of the temperature difference power generation module.
It significantly improves the maximum power of the photovoltaic cell and the output power of the temperature differential power generation module, increases the cold-end heat dissipation capacity of the temperature differential power generation module, reduces the temperature of the photovoltaic panel, and improves the energy utilization rate of the system.
Smart Images
Figure CN222192178U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic power generation, in particular to an efficiency-enhancing device for a photovoltaic temperature difference hybrid power generation system. Background Art
[0002] In the photovoltaic temperature difference hybrid power generation system, the temperature difference power generation module is installed on the back of the photovoltaic power generation module, which can utilize the full spectrum solar energy, absorb more solar irradiance, improve the utilization rate of solar energy, and improve the total power output and conversion efficiency. The temperature difference power generation device can not only use the waste heat of photovoltaic cells to generate electricity, increase power output, and improve the energy utilization rate of the system, but also serve as a cooling system for photovoltaic cells to cool photovoltaic devices and improve the photoelectric conversion efficiency of photovoltaic cells.
[0003] The overall efficiency of the photovoltaic temperature difference hybrid power generation system is affected by the irradiance and temperature of the system. The efficiency of the temperature difference power generation module mainly depends on the temperature difference between the cold and hot ends. In the photovoltaic temperature difference hybrid power generation system, the temperature difference power generation is very small compared with the photovoltaic output power, and accounts for a very small proportion in the photovoltaic temperature difference hybrid power generation system. One of the keys to improving the total output power of the photovoltaic temperature difference hybrid module is to increase the temperature difference between the cold and hot ends of the temperature difference power generation module.
[0004] In actual engineering applications, in order to increase the temperature difference between the cold end and the hot end of the power generation module, a solution of installing fins at the cold end of each temperature difference power generation plate, such as shown in patent document 1, can be used. However, the engineering workload of installing the fins is large, and the fins are heavy, easy to fall off during system operation, and difficult to maintain; a solution using phase change materials, such as shown in patent document 2, can also be used, but the material cost of phase change material heat dissipation is relatively high; in addition, a liquid cooling solution, such as shown in patent document 3, can also be used, but liquid cooling is not suitable for some photovoltaic power stations built on mountains, deserts, and Gobi deserts where water resources are scarce, and liquid cooling technology usually requires the addition of pumps, which increases power consumption and system maintenance costs.
[0005] According to the above, there is currently no efficiency-enhancing device for a photovoltaic temperature difference hybrid power generation system with high applicability and low operation and maintenance costs.
[0006] Prior art literature
[0007] Patent document 1CN201878057U A solar photovoltaic device with a temperature difference power generation device
[0008] Patent document 2CN111404478A Photovoltaic thermal temperature difference power generation assembly and power generation system
[0009] Patent document 3CN214205462U A photovoltaic module backplane cooling device based on temperature difference power generation Utility Model Content
[0010] In view of the technical problems existing in photovoltaic power generation in the prior art, the first aspect of the utility model proposes an efficiency enhancement device for a photovoltaic temperature difference hybrid power generation system, comprising:
[0011] A thermoelectric power generation component, wherein the hot end of the thermoelectric power generation component is attached to the back plate of the photovoltaic panel;
[0012] A cooling component connected to the cold end of the temperature difference power generation component;
[0013] Wherein, the cooling component comprises a flat heat pipe component, the flat heat pipe component comprises an evaporation region and a condensation region, the evaporation region covers part or all of the area of the temperature difference power generation component, and the condensation region is outside the frame range of the photovoltaic panel;
[0014] In the evaporation region, the liquid in the porous liquid absorption structure of the flat heat pipe component absorbs heat and evaporates into the steam chamber;
[0015] In the condensation region, the steam in the steam cavity of the flat heat pipe component releases heat, condenses and enters the porous liquid absorption structure.
[0016] Preferably, the cooling component further comprises a heat conducting plate, and the heat conducting plate is connected between the temperature difference power generation component and the flat plate heat pipe component.
[0017] Preferably, the thermoelectric power generation component includes a plurality of thermoelectric power generation sheets, and the plurality of thermoelectric power generation sheets are evenly distributed on one side of the back plate of the photovoltaic panel, the evaporation area covers at least two of the thermoelectric power generation sheets, and the outer contour of the heat conductive plate covers the outside of all the thermoelectric power generation sheets.
[0018] Preferably, the heat conducting plate comprises an aluminum plate, a heat conducting silicone layer is provided between the aluminum plate and each of the temperature difference power generation sheets, the flat heat pipe component is configured in a plate shape, and a heat conducting silicone layer is provided between the flat heat pipe component and the aluminum plate.
[0019] Preferably, the thickness of the aluminum plate is 0.5 mm.
[0020] Preferably, the plurality of thermoelectric power generation sheets are distributed in a rectangular array, and the plurality of thermoelectric power generation sheets are connected in series via wires, wherein the incoming side and the outgoing side of the wires are located on the same side of the photovoltaic panel.
[0021] Preferably, the spacing between the thermoelectric power generation sheets distributed longitudinally is 40 mm, and the spacing between the thermoelectric power generation sheets distributed transversely is 50 mm.
[0022] Preferably, the porous liquid absorption structure and the steam chamber are arranged along the width direction of the temperature difference power generation component.
[0023] Preferably, each of the thermoelectric power generation components covers at least two rows of thermoelectric power generation sheets, the porous liquid absorption structure is arranged corresponding to the position of the thermoelectric power generation sheets, and the steam chamber is arranged corresponding to the gap between the two rows of thermoelectric power generation sheets.
[0024] Preferably, the area of the evaporation region of the temperature difference power generation component is larger than the area of the condensation region.
[0025] Compared with the prior art, the advantages of the utility model are:
[0026] The present application transfers the heat from the back of the photovoltaic panel to the hot end of the temperature difference power generation module through heat conduction, thereby reducing the temperature of the photovoltaic panel, and then uses an aluminum plate and a flat heat pipe component to increase the heat dissipation capacity of the cold end of the temperature difference power generation module. Among them, the aluminum plate plays a role in strengthening the connection, increasing the heat exchange area, and increasing the heat dissipation channel, while the flat heat pipe component further enhances the heat exchange effect of the cold end of the temperature difference power generation module, enhances the heat dissipation of the cold end, and further increases the temperature difference. This hybrid power generation device not only increases the maximum power of the photovoltaic cell, but also significantly increases the output power of the temperature difference power generation module, thereby achieving the synergistic effect of the photovoltaic temperature difference hybrid power generation device. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings, in which:
[0028] Figure 1 It is a structural schematic diagram of the efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system shown in the utility model;
[0029] Figure 2 It is a schematic diagram of the distribution of multiple temperature difference power generation sheets on the back plate of the photovoltaic panel shown in the utility model;
[0030] Figure 3 It is a schematic diagram of the relative position distribution of the flat heat pipe component and the temperature difference power generation sheet shown in the utility model;
[0031] Figure 4 It is a schematic diagram of the evaporation area and the condensation area of the flat heat pipe component shown in the utility model;
[0032] Figure 5 is a graph showing the output power variation of the temperature difference power generation module under different cooling conditions shown in the embodiment of the utility model;
[0033] Figure 6 It is a diagram showing the maximum power variation of photovoltaic cells under different cooling conditions shown in the embodiment of the present utility model. DETAILED DESCRIPTION
[0034] In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.
[0035] It should be understood that the principle of photovoltaic and thermoelectric hybrid power generation is: when the photovoltaic panel is exposed to light, the part of the photon energy in the solar irradiance that is higher than the semiconductor band gap is directly converted into electrical energy according to the principle of the photovoltaic effect, and the rest is converted into thermal energy. Part of the thermal energy is dissipated into the environment, and the remaining thermal energy is transferred to the thermoelectric power generation module through heat conduction. The hot end of the thermoelectric power generation module is the photovoltaic cell backplane, and the cold end is equipped with a cooling device. The temperature difference between the hot and cold ends of the thermoelectric power generation module forms a temperature difference, and electrical energy is generated through the Seebeck effect.
[0036] Among them, the main influencing factor for power generation using a thermoelectric power generation module is the temperature difference between the cold and hot ends of the thermoelectric power generation module. Although there are many solutions for creating a large temperature difference in the prior art, such as air cooling, water cooling, phase change thermal materials, etc., the economy and reliability of the application and whether it is suitable for the installation environment should be considered.
[0037] Combination Figure 1 As shown, the first aspect of the utility model proposes an efficiency enhancement device for a photovoltaic temperature difference hybrid power generation system, comprising a photovoltaic panel 10, a temperature difference power generation component 20 and a cooling component, the hot end of the temperature difference power generation component 20 is attached to the back plate of the photovoltaic panel 10, and the cooling component is connected to the cold end of the temperature difference power generation component 20.
[0038] After the photovoltaic panel 10 is radiated by the sun, the heat is transferred to the back plate. Therefore, the hot end of the thermoelectric power generation component 20 has a high temperature, while the cold end of the thermoelectric power generation component 20 is cooled by the cooling component and has a lower temperature than the hot end of the thermoelectric power generation component 20, thus forming a temperature difference.
[0039] Optionally, the photovoltaic panel 10 uses a single crystal single glass component, and multiple photovoltaic panels 10 are connected by a photovoltaic connector.
[0040] Optionally, the temperature difference power generation component 20 can be connected in parallel with the corresponding photovoltaic panel 10, or can be connected in series alone. However, connecting it in parallel with the corresponding photovoltaic panel 10 can reduce the difficulty of assembly.
[0041] Combination Figure 2 As shown, the temperature difference power generation component 20 includes a plurality of temperature difference power generation sheets, and the plurality of temperature difference power generation sheets are evenly distributed on one side of the back plate of the photovoltaic panel 10 .
[0042] Optionally, multiple thermoelectric power generation sheets are distributed in a rectangular array, and the multiple thermoelectric power generation sheets are connected in series through a wire 21, wherein the incoming wire side and the outgoing wire side of the wire 21 are located on the same side of the photovoltaic panel 10. In this way, the incoming wires and the outgoing wires of the multiple thermoelectric power generation sheets on the same side are convenient for users to connect them to the connector.
[0043] In a specific embodiment, the spacing between the thermoelectric power generation sheets distributed longitudinally is 40 mm, and the spacing between the thermoelectric power generation sheets distributed transversely is 50 mm. The thermoelectric power generation sheet has a size of 40 mm×40 mm×4.3 mm and contains 127 pairs of thermocouples.
[0044] In this way, by setting gaps between the thermoelectric power generation sheets, the heat dissipation capacity of the photovoltaic backplane can be increased, avoiding the decrease in the power generation capacity of the photovoltaic panels due to the high heat of the photovoltaic panels. At the same time, the gaps between the thermoelectric power generation sheets are conducive to the heat dissipation of the cooling structure.
[0045] Specifically, the cooling component includes a flat heat pipe component 40 , and the flat heat pipe component 40 includes an evaporation region 401 and a condensation region 402 . The evaporation region 401 covers at least two temperature difference power generation sheets, and the condensation region 402 is outside the frame range of the photovoltaic panel 10 .
[0046] It should be understood that the flat heat pipe component 40 includes a porous liquid absorbing structure 41 and a steam chamber 42. The porous liquid absorbing structure 41 stores volatile liquid. When the volatile liquid is heated, it evaporates and enters the steam chamber 42. The steam in the steam chamber 42 is absorbed by the porous liquid absorbing structure 41 after condensation.
[0047] Specifically, in the evaporation region 401, the liquid in the porous liquid absorbing structure 41 in the flat heat pipe component 40 absorbs heat and evaporates into the steam chamber 42. After the pressure in the evaporation region 401 increases, the steam chamber 42 causes the gas to move to the condensation region 402. Since the temperature in the condensation region 402 is low, in the condensation region 402, the steam in the steam chamber 42 in the flat heat pipe component 40 releases heat, condenses and enters the porous liquid absorbing structure 41. Due to the capillary siphon effect of the porous liquid absorbing structure 41, the liquid in the porous liquid absorbing structure 41 in the condensation region 402 moves to the evaporation region 401, forming a circulation process, and the speed of the circulation is determined by the heat dissipation capacity of the condensation region 402.
[0048] In this way, the cold end of the thermoelectric power generation sheet in the evaporation area 401 can be cooled and lowered in a targeted manner through this cooling structure.
[0049] Furthermore, in order to enhance the heat dissipation effect, the cooling component also includes a heat conducting plate 30, which is connected between the thermoelectric power generation component 20 and the flat heat pipe component 40, and the outer contour of the heat conducting plate 30 covers the outer sides of all the thermoelectric power generation sheets.
[0050] In this way, the heat dissipation area of the cold end of the temperature difference power generation chip can be increased by using the heat conductive plate 30. The heat conductive plate 30 includes an aluminum plate. The aluminum plate has good thermal conductivity and has the advantages of easy heat dissipation, low density, light weight, and easy installation, maintenance and transportation. At the same time, aluminum has low cost and has the advantages of oxidation and corrosion resistance, high strength, and small deformation.
[0051] If the flat heat pipe component 40 and the temperature difference power generation sheet are connected through a thermally conductive silicone layer, the bonding area of the silicone layer is small and the temperature of the bonding layer is high, making the adhesive connection of the flat heat pipe component 40 unreliable. In a preferred embodiment, a thermally conductive silicone layer is provided between the aluminum plate and each temperature difference power generation sheet, the flat heat pipe component 40 is configured in a plate shape, and a thermally conductive silicone layer is provided between the flat heat pipe component and the aluminum plate.
[0052] In this way, the plate surface of the flat heat pipe component 40 is smooth, and the aluminum plate is combined with the evaporation area 401 of the flat heat pipe component 40. The aluminum plate makes the evaporation section of the heat pipe relatively uniformly heated, which is conducive to the heat pipe to fully and effectively exert its performance. In addition, the use of the aluminum plate can significantly increase the heat dissipation area and bonding area between the thermoelectric power generation sheet and the flat heat pipe component 40, greatly improving the bonding reliability of the thermal conductive silicone layer. At the same time, the aluminum plate also increases the contact area with the air, and can dissipate heat to the environment in the form of thermal convection and thermal radiation, so that the heat at the cold end of the thermoelectric power generation sheet is dissipated quickly.
[0053] In an optional embodiment, the thickness of the aluminum plate is 0.5 mm.
[0054] Combination Figure 3-4 As shown, the porous liquid absorbing structure 41 and the steam chamber 42 are arranged along the width direction of the thermoelectric power generation component 20 rather than along the thickness direction. Optionally, each thermoelectric power generation component 20 covers at least two rows of thermoelectric power generation sheets, the porous liquid absorbing structure 41 is arranged corresponding to the position of the thermoelectric power generation sheets, and the steam chamber 42 is arranged corresponding to the gap between the two rows of thermoelectric power generation sheets.
[0055] In this way, the porous liquid absorbing structure 41 in the evaporation area 401 can specifically receive the heat transferred by the thermoelectric power generation sheet, and the porous liquid absorbing structure 41 accounts for a large proportion, which can improve the heat conduction efficiency to achieve a better cooling effect.
[0056] In an optional embodiment, the area of the evaporation region 401 of the temperature difference power generation component 20 is larger than the area of the condensation region 402. This can reduce consumables and installation weight.
[0057] Test of power generation capacity of the newly added temperature difference power generation component 20:
[0058] A photovoltaic temperature difference hybrid power generation test system is built, which mainly includes an indoor solar energy simulation system, a photovoltaic power generation module, a temperature difference power generation module, a cooling device, a thermocouple (T type) and a data acquisition instrument, and is mainly used to test the temperature characteristics and output characteristics of the photovoltaic temperature difference hybrid power generation system.
[0059] Among them, due to the influence of weather, environment and other factors, the natural light source is constantly changing. In order to obtain more stable experimental results, the test uses indoor light sources, and the indoor light sources use the ATLAS UV ultraviolet light sunlight simulation test system; the temperature measurement uses the T-type thermocouple wire temperature measurement wire with high sensitivity, large thermoelectric potential, and temperature approximate linearity as the temperature sensor, the model is TT-T-30-SLE (T type), and its material is insulated copper-constantan; the test uses the powerful and flexible Agilent 34970A data acquisition instrument, which can be combined with thermocouples to measure temperature, including DC voltage, AC voltage, DC current, AC current and other signals. The test mainly compares the performance of photovoltaic temperature difference hybrid power generation system under different cooling conditions.
[0060] Combination Figure 5 As shown in the figure, with the increase of irradiance, the temperature of the photovoltaic panel increases, the temperature difference increases, and the output power of the TE device increases approximately linearly; after installing the flat heat dissipation aluminum plate, the output power of the temperature difference power generation device increases, and increases with the increase of irradiance. 2 Enhanced to 850W / m 2 , P TE The output power increased from 1.32mW to 4.80mW with the irradiation intensity increasing by 8.7×10 -3 mW / (W / m 2 ); After further installing heat pipes on the flat heat dissipation aluminum plate, the output power of the temperature difference power generation device is further increased. 2 When P TE The output power increased by 9.55×10 -3 mW / (W / m 2 ).
[0061] Combination Figure 6 As shown in the figure, after installing the flat aluminum plate, the maximum power of the photovoltaic cell increased by 0.1-0.2W, an increase of 0.9% to 1.8%; after installing the heat pipe on the basis of the flat aluminum plate, compared with only installing the flat aluminum plate, the heat pipe has a small effect on the gain of the maximum power of the photovoltaic cell, and the maximum power of the photovoltaic cell is slightly increased under low irradiance.
[0062] It can be seen that from the perspective of power generation, the heat conducting plate 30 has a gain effect on the power generation of the temperature difference power generation component and the photovoltaic panel, especially at low irradiance.
[0063] In combination with the above embodiments, the present application transfers the heat from the back of the photovoltaic panel to the hot end of the thermoelectric power generation module through heat conduction, thereby reducing the temperature of the photovoltaic panel, and then uses aluminum plates and flat heat pipe components to increase the heat dissipation capacity of the cold end of the thermoelectric power generation module. Among them, the aluminum plate plays a role in strengthening the connection, increasing the heat exchange area, and increasing the heat dissipation channel, while the flat heat pipe component further enhances the heat exchange effect of the cold end of the thermoelectric power generation module, enhances the heat dissipation of the cold end, and further increases the temperature difference. This hybrid power generation device not only increases the maximum power of the photovoltaic cell, but also significantly increases the output power of the thermoelectric power generation module, thereby achieving the synergy effect of the photovoltaic thermoelectric hybrid power generation device.
[0064] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.
Claims
1. A photovoltaic temperature difference hybrid power generation system efficiency enhancement device, characterized in that: include: A temperature difference power generation component (20), wherein a hot end of the temperature difference power generation component (20) is attached to a back plate of a photovoltaic panel (10); A cooling component connected to the cold end of the temperature difference power generation component (20); The cooling component comprises a flat heat pipe component (40), the flat heat pipe component (40) comprising an evaporation region (401) and a condensation region (402), the evaporation region (401) covers part or all of the temperature difference power generation component (20), and the condensation region (402) is outside the frame range of the photovoltaic panel (10); In the evaporation region (401), the liquid in the porous liquid absorption structure (41) in the flat heat pipe component (40) absorbs heat and evaporates into the steam chamber (42); In the condensation area (402), the steam in the steam chamber (42) of the flat heat pipe component (40) releases heat, condenses, and enters the porous liquid absorption structure (41).
2. The efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system according to claim 1, characterized in that: The cooling component further comprises a heat conducting plate (30), wherein the heat conducting plate (30) is connected between the temperature difference power generation component (20) and the flat plate heat pipe component (40).
3. The efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system according to claim 2, characterized in that: The thermoelectric power generation component (20) comprises a plurality of thermoelectric power generation sheets, the plurality of thermoelectric power generation sheets being evenly distributed on one side of a back plate of a photovoltaic panel (10), the evaporation region (401) covering at least two of the thermoelectric power generation sheets, and the outer contour of the heat conducting plate (30) covering the outside of all the thermoelectric power generation sheets.
4. The efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system according to claim 3 is characterized in that: The heat conducting plate (30) comprises an aluminum plate, a heat conducting silicone layer is provided between the aluminum plate and each of the temperature difference power generation sheets, and the flat plate heat pipe component (40) is configured in a plate shape, a heat conducting silicone layer is provided between the flat plate heat pipe component and the aluminum plate.
5. The efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system according to claim 4, characterized in that: The thickness of the aluminum plate is 0.5 mm.
6. The efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system according to claim 3, characterized in that: The plurality of thermoelectric power generation sheets are distributed in a rectangular array, and the plurality of thermoelectric power generation sheets are connected in series via a conductor (21), wherein the incoming side and the outgoing side of the conductor (21) are located on the same side of the photovoltaic panel (10).
7. The efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system according to claim 6, characterized in that: The spacing between the thermoelectric power generation sheets distributed longitudinally is 40 mm, and the spacing between the thermoelectric power generation sheets distributed transversely is 50 mm.
8. The efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system according to claim 1, characterized in that: The porous liquid absorption structure (41) and the steam chamber (42) are arranged along the width direction of the temperature difference power generation component (20).
9. The efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system according to claim 6, characterized in that: Each of the temperature difference power generation components (20) covers at least two rows of temperature difference power generation sheets, the porous liquid absorption structure (41) is arranged corresponding to the position of the temperature difference power generation sheets, and the steam chamber (42) is arranged corresponding to the gap between the two rows of temperature difference power generation sheets.
10. The efficiency enhancement device of the photovoltaic temperature difference hybrid power generation system according to claim 1, characterized in that: The area of the evaporation region (401) of the temperature difference power generation component (20) is larger than the area of the condensation region (402).