A diurnal radiation thermoelectric power generation device and method

Abstract

This invention relates to the field of solar power generation technology and discloses a diurnal radiation thermoelectric power generation device and method. Through the coupling between a heat pipe, a thermoelectric power generation layer, a photovoltaic power generation layer, and a radiation cooling layer, the photovoltaic power generation layer absorbs short-wavelength solar energy to generate electricity, while the thermoelectric power generation layer utilizes long-wavelength solar energy to generate electricity. Furthermore, the use of a trough concentrator to concentrate sunlight increases the power output of the integrated power generation device and reduces costs. The heat pipe quickly removes heat from the cold end of the thermoelectric power generation layer on the concentrator side, increasing the temperature difference between the hot and cold ends of the trough concentrator and reducing the temperature of the photovoltaic power generation layer. This effectively improves the power generation efficiency of the photovoltaic thermoelectric integrated power generation device, utilizing the full spectrum of solar energy for efficient power generation, saving energy and protecting the environment. It effectively improves photoelectric conversion efficiency and enables continuous day and night power generation, broadening practical application scenarios.

Description

Technical Field

[0001] This invention relates to the field of solar power generation technology, and in particular to a diurnal radiation thermoelectric power generation device and method. Background Technology

[0002] Currently, due to restrictions imposed by regulatory bodies, photovoltaic (PV) cells can only absorb and utilize energy in the shortwave band of the sun for photovoltaic power generation; the remaining solar energy is converted into heat. This heat not only cannot be utilized by PV cells, directly dissipating into the environment and wasting energy, but also causes the operating temperature to rise due to the inability to dissipate heat quickly, reducing the photoelectric conversion efficiency of the PV cells. Furthermore, although PV power generation offers a viable commercial approach, enabling small-scale grid-connected power generation during the day, it is difficult to achieve small-scale distributed power generation without energy storage at night due to the lack of sunlight. In summary, current solar power generation technology suffers from problems such as inefficient use of solar radiation during the day, low power generation efficiency, and the inability to achieve continuous day and night power generation.

[0003] Existing technology provides a photovoltaic-thermal combined power generation device based on solar frequency division, including a concentrator module, a spectrum splitter, a solar thermal power generation module, a photovoltaic power generation module, and a battery for storing electrical energy. The concentrator module focuses sunlight onto the spectrum splitter. The spectrum splitter splits the sunlight focused by the concentrator module into two paths according to the spectrum, one path being a high-frequency solar thermal power generation path and the other a low-frequency photovoltaic power generation path. The solar thermal power generation module includes a heat collection plate capable of absorbing high-frequency light and a first thermoelectric component attached to the bottom of the heat collection plate. The photovoltaic power generation module includes an outer shell and a photovoltaic component located at the bottom of the outer shell. A frequency divider for absorbing infrared light to generate solar thermal power is provided at the opening of the outer shell of the photovoltaic power generation module. The heat from the frequency divider and the waste heat from the photovoltaic component generate electricity through a second thermoelectric component. This existing technology suffers from the problem that some thermal energy cannot be utilized by the photovoltaic cells, resulting in low photoelectric conversion efficiency. Summary of the Invention

[0004] One objective of this invention is to provide a diurnal radiation thermoelectric power generation device that can utilize the waste heat of photovoltaic cells and the low-temperature characteristics of outer space to generate electricity, effectively improving the photoelectric conversion efficiency, and realizing the utilization of solar energy across the entire spectrum and continuous power generation day and night. Another objective of this invention is to provide a diurnal radiation thermoelectric power generation method.

[0005] To achieve the above objectives, the present invention provides a diurnal radiation thermoelectric power generation device, comprising a trough concentrator, a glass shell, a photovoltaic power generation layer, a radiation cooling layer, a thermoelectric power generation layer, and a heat pipe. The trough concentrator is located below the heat pipe, and the heat pipe is disposed at the focusing center of the trough concentrator. The thermoelectric power generation layer is fitted onto the heat pipe. The radiation cooling layer is disposed on the outside of the thermoelectric power generation layer facing the sky. The photovoltaic power generation layer is disposed on the outside of the thermoelectric power generation layer facing the trough concentrator. The glass shell is fitted onto the photovoltaic power generation layer and the radiation cooling layer. The trough concentrator, the glass shell, the photovoltaic power generation layer, the radiation cooling layer, the thermoelectric power generation layer, and the heat pipe are all coaxially arranged.

[0006] Preferably, the heat pipe is located at the evaporation end of the focusing center portion of the trough concentrator.

[0007] Preferably, the thermoelectric power generation layer includes a sky-side thermoelectric power generation layer and a concentrator-side thermoelectric power generation layer. The outer side of the sky-side thermoelectric power generation layer faces the sky, and the radiative cooling layer is disposed on the outer side of the sky-side thermoelectric power generation layer. The outer side of the concentrator-side thermoelectric power generation layer faces the trough concentrator, and the photovoltaic power generation layer is disposed on the outer side of the concentrator-side thermoelectric power generation layer.

[0008] Preferably, the sky-side thermoelectric power generation layer includes a hot end and a cold end, the cold end of the sky-side thermoelectric power generation layer is attached to the inner side of the radiative cooling layer, and the hot end of the sky-side thermoelectric power generation layer is attached to the evaporation end of the heat pipe.

[0009] Preferably, the concentrator-side thermoelectric power generation layer includes a hot end and a cold end, wherein the hot end is attached to the inner side of the photovoltaic power generation layer, and the cold end is attached to the evaporation end of the heat pipe.

[0010] Preferably, the thermoelectric power generation layer further includes P-type thermoelectric leg blocks and N-type thermoelectric leg blocks, wherein the inner cross-sectional area of ​​the P-type thermoelectric leg blocks and N-type thermoelectric leg blocks is smaller than the outer cross-sectional area, and the P-type thermoelectric leg blocks and N-type thermoelectric leg blocks are arranged at intervals along the circumference.

[0011] Preferably, a vacuum layer is formed between the glass shell, the photovoltaic power generation layer, and the radiation cooling layer.

[0012] Preferably, the radiative cooling layer includes a reflective layer and an emitting layer, the reflective layer is located on the side closer to the heat pipe, the emitting layer is fitted on the outside of the reflective layer, and the outer surface of the cold end of the sky-side thermoelectric power generation layer is attached to the inner surface of the reflective layer.

[0013] Preferably, the photovoltaic power generation layer, the radiation cooling layer, the thermoelectric power generation layer, and the heat pipe are all bonded together with insulating thermally conductive silicone grease.

[0014] This invention also provides a method for diurnal radiation thermoelectric power generation, comprising the following steps: during daytime sunlight, sunlight shines on the trough concentrator, which reflects and focuses the incident sunlight through a glass shell onto the surface of the photovoltaic power generation layer; the remaining sunlight shines through the glass shell onto the radiation cooling layer; the reflective layer reflects most of the sunlight hitting the radiation cooling layer into the atmosphere; the emitting layer dissipates heat into the atmosphere through its own thermal radiation, thereby lowering the temperature of the cold end of the sky-side thermoelectric power generation layer that is in contact with the reflective layer; the photovoltaic power generation layer absorbs long-wavelength solar radiation and converts it into heat energy, which is transferred to the hot end of the concentrator-side thermoelectric power generation layer, causing its temperature to rise; the hot end of the concentrator-side thermoelectric power generation layer transfers the heat to the cold end of the concentrator-side thermoelectric power generation layer, converting part of the heat into electrical energy. The cold end of the concentrator-side thermoelectric generator layer transfers heat energy to the evaporator end. The working fluid inside the evaporator end absorbs heat through evaporation and transfers it to the condenser end of the heat pipe. The heat is then dissipated through condensation of the working fluid inside the condenser end, causing the temperature of the cold end of the concentrator-side thermoelectric generator layer to decrease. The evaporator end then transfers heat to the hot end of the sky-side thermoelectric generator layer, causing its temperature to rise. The hot end of the sky-side thermoelectric generator layer transfers heat to the cold end of the sky-side thermoelectric generator layer, converting some of the heat into electrical energy. The cold end of the sky-side thermoelectric generator layer transfers heat to the reflective layer. At night, when there is no sunlight, the radiative cooling layer dissipates its own heat through thermal radiation, causing its temperature to decrease. The cold end of the sky-side thermoelectric generator layer transfers heat to the radiative cooling layer, causing its temperature to drop below that of the hot end of the sky-side thermoelectric generator layer, thus generating electrical energy.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] Through the coupling between heat pipes, thermoelectric power generation layer, photovoltaic power generation layer, and radiative cooling layer, the photovoltaic power generation layer absorbs short-wave solar energy to generate electricity, while the thermoelectric power generation layer utilizes long-wave solar energy to generate electricity. Furthermore, the trough concentrator concentrates sunlight, which can improve the power generation of the integrated power generation device and reduce costs. The heat pipe can quickly remove heat from the cold end of the thermoelectric power generation layer on the concentrator side, increasing the temperature difference between the hot and cold ends of the trough concentrator and reducing the temperature of the photovoltaic power generation layer. This can effectively improve the power generation efficiency of the photovoltaic thermoelectric integrated power generation device, utilize the full spectrum of solar energy, efficiently utilize solar energy for power generation, save energy and protect the environment, effectively improve photoelectric conversion efficiency, and achieve continuous power generation day and night, thus broadening practical application scenarios. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of the diurnal radiation thermoelectric power generation device according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional schematic diagram of the diurnal radiation thermoelectric power generation device according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the thermoelectric power generation layer of the day-night radiation thermoelectric power generation device according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram illustrating the working principle of the diurnal radiation thermoelectric power generation device according to an embodiment of the present invention.

[0021] In the diagram, 1. Parabolic trough concentrator; 2. Glass outer shell; 3. Vacuum layer; 4. Photovoltaic power generation layer; 5. Radiative cooling layer; 51. Emitting layer; 52. Reflecting layer; 6. Thermoelectric power generation layer; 61. Concentrator-side thermoelectric power generation layer; 62. Sky-side thermoelectric power generation layer; 63. Hot end of sky-side thermoelectric power generation layer; 64. Cold end of sky-side thermoelectric power generation layer; 65. Hot end of concentrator-side thermoelectric power generation layer; 66. Cold end of concentrator-side thermoelectric power generation layer; 7. Heat pipe; 71. Evaporator end; 8. P-type thermoelectric leg block; 9. N-type thermoelectric leg block; 10. Inner metal conductive sheet; 11. Outer metal conductive sheet; 12. Sunlight incident; 13. Sunlight reflection; 14. Thermal radiation. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] Example 1

[0027] like Figure 1 As shown, a preferred embodiment of the present invention provides a diurnal radiation thermoelectric power generation device, comprising a trough concentrator 1, a glass shell 2, a photovoltaic power generation layer 4, a radiation cooling layer 5, a thermoelectric power generation layer 6, and a heat pipe 7. The trough concentrator 1 is located below the heat pipe 7, and the heat pipe 7 is disposed at the focusing center of the trough concentrator 1. The thermoelectric power generation layer 6 is fitted onto the heat pipe 7. The radiation cooling layer 5 is disposed on the outside of the thermoelectric power generation layer 6 facing the sky. The photovoltaic power generation layer 4 is disposed on the outside of the thermoelectric power generation layer 6 facing the trough concentrator 1. The glass shell 2 is fitted onto the photovoltaic power generation layer 4 and the radiation cooling layer 5. The trough concentrator 1, the glass shell 2, the photovoltaic power generation layer 4, the radiation cooling layer 5, the thermoelectric power generation layer 6, and the heat pipe 7 are all coaxially arranged.

[0028] The thermoelectric layer 6 can absorb heat energy and generate electricity based on the Seebeck effect. By coupling the thermoelectric layer 6 with the photovoltaic layer 4, the solar spectral energy that the photovoltaic layer 4 cannot utilize can be converted into heat energy and transferred to the thermoelectric device for use, effectively reducing the surface temperature of the battery and generating additional electrical energy output, thereby realizing the utilization of solar energy across the entire spectrum.

[0029] Heat pipe 7 can quickly dissipate heat through the evaporation and condensation of the working fluid. The heat pipe 7 and photovoltaic power generation layer 4 are coupled with thermoelectric power generation layer 6 to form a photovoltaic-thermal-heat pipe structure, which increases the temperature difference between the hot and cold ends of thermoelectric power generation layer 6 and reduces the surface temperature of photovoltaic power generation layer 4, effectively improving the photoelectric conversion efficiency of the device.

[0030] Radiation cooling is a passive cooling technology that utilizes its high solar reflectivity and high thermal emissivity to reflect solar radiation and radiate heat into the cold universe through "atmospheric windows," such as 0.3μm–2.5μm, 3.2μm–4.8μm, and 7μm–14μm, achieving a cooling effect below ambient temperature. Coupled with heat pipe 7 and thermoelectric layer 6, during the day, the temperature difference between the hot and cold ends of the thermoelectric generator can be increased, and the surface temperature of the photovoltaic cells can be reduced, improving the photoelectric conversion efficiency of the device. At night, utilizing the low-temperature cold source characteristics of outer space, the thermoelectric generator can also generate electricity, achieving continuous day and night power generation.

[0031] This photovoltaic (PV) thermoelectric power generation device utilizes radiative cooling and heat pipes. Photovoltaic cells absorb short-wavelength solar energy, while thermoelectric cells utilize long-wavelength solar energy. This device can utilize the full spectrum of solar energy, improving solar energy utilization efficiency. Furthermore, the use of a trough concentrator to concentrate sunlight increases the device's power output and reduces costs. The heat pipes rapidly remove heat from the cold end of the thermoelectric layer on the concentrator side, increasing the temperature difference between the hot and cold ends and lowering the temperature of the photovoltaic layer, effectively improving the device's power generation efficiency.

[0032] In this embodiment, the photovoltaic power generation layer is a flexible perovskite solar cell.

[0033] The heat pipe 7 is located at the focusing center of the trough concentrator 1, which is the evaporation end 71. To the right of the evaporation end 71 are the adiabatic end and the condensation end, both of which extend beyond the concentrator. The width of the concentrator only covers the evaporation end 71 of the heat pipe 7.

[0034] like Figure 3 As shown, the thermoelectric power generation layer 6 includes a sky-side thermoelectric power generation layer 62 and a concentrator-side thermoelectric power generation layer 61. The sky-side thermoelectric power generation layer 62 and the concentrator-side thermoelectric power generation layer 61 are independent and not connected. The outer side of the sky-side thermoelectric power generation layer 62 faces the sky, and the radiation cooling layer 5 is disposed on the outer side of the sky-side thermoelectric power generation layer 62. The outer side of the concentrator-side thermoelectric power generation layer 61 faces the trough concentrator 1, and the photovoltaic power generation layer 4 is disposed on the outer side of the concentrator-side thermoelectric power generation layer 61. The radiation cooling layer is coupled with the sky-side thermoelectric power generation layer. Due to its high reflectivity and emissivity, it can dissipate heat and cool down by reflecting sunlight and radiating it to the atmosphere, thereby reducing the cold end temperature of the sky-side thermoelectric power generation layer. This allows the integrated power generation device to generate electricity continuously during the day and night.

[0035] The sky-side thermoelectric power generation layer 62 includes a hot end 63 and a cold end 64. The cold end 64 is attached to the inner side of the radiation cooling layer 5, and the hot end 63 is attached to the evaporation end 71.

[0036] The concentrator-side thermoelectric power generation layer 61 includes a hot end 65 and a cold end 66. The hot end 65 is attached to the inner side of the photovoltaic power generation layer 4, and the cold end 66 is attached to the evaporation end 71.

[0037] like Figure 2 As shown, 10 is the inner metal conductive sheet, 11 is the outer metal conductive sheet, and the thermoelectric power generation layer 6 also includes P-type thermoelectric leg blocks 8 and N-type thermoelectric leg blocks 9. The inner cross-sectional area of ​​the P-type thermoelectric leg blocks 8 and N-type thermoelectric leg blocks 9 is smaller than the outer cross-sectional area. The P-type thermoelectric leg blocks 8 and N-type thermoelectric leg blocks 9 are arranged circumferentially at intervals, and the material is bismuth telluride. The thermoelectric leg blocks with variable cross-sectional areas are beneficial to improving the power generation efficiency of the thermoelectric power generation layer. One P-type thermoelectric leg block 8 and one N-type thermoelectric leg block 9 are welded to the same metal conductive sheet.

[0038] A vacuum layer 3 is formed by evacuating the glass shell 2 between the photovoltaic power generation layer 4 and the radiative cooling layer 5. The vacuum layer can prevent the environment from corroding the photovoltaic power generation layer and the radiative cooling layer, and prevent the photovoltaic power generation layer from losing heat directly from the surface through convection and heat conduction with the air.

[0039] The concentration of light by the trough concentrator 1 can increase the power output of the integrated power generation device and reduce costs. Meanwhile, the vacuum layer can prevent environmental corrosion of the photovoltaic power generation layer and the radiative cooling layer, improving the device's durability and expanding its practical application scenarios.

[0040] like Figure 2 As shown, the radiative cooling layer 5 includes a reflective layer 52 and an emitting layer 51. The reflective layer 52 is located closer to the heat pipe 7, and the emitting layer 51 is fitted onto the outside of the reflective layer 52. The outer surface of the cold end 64 of the sky-side thermoelectric power generation layer is attached to the inner surface of the reflective layer 52. Figure 2 As shown, the semi-annular radiation cooling layer 5 is divided into a coaxial semi-annular reflective layer 52 and an emitting layer 51. The silver film reflective layer is deposited onto the lithium fluoride emitting layer by electron beam evaporation.

[0041] The photovoltaic power generation layer 4, the radiation cooling layer 5, the thermoelectric power generation layer 6, and the heat pipe 7 are all bonded together using insulating thermally conductive silicone grease. This insulating thermally conductive silicone grease reduces the contact thermal resistance between the layers, preventing heat buildup.

[0042] This invention also provides a method for generating electricity through diurnal radiation thermodynamic difference, such as... Figure 4As shown, 12 represents the incident direction of sunlight, 13 represents the reflected direction of sunlight, and 14 represents thermal radiation. The steps include: during daytime sunlight, sunlight shines on the trough concentrator 1, which reflects and focuses the incident sunlight through the glass shell 2 onto the surface of the photovoltaic power generation layer 4. The photovoltaic power generation layer 4 is a flexible perovskite solar cell that can absorb the reflected sunlight and use the photovoltaic effect to convert short-wavelength (below 800nm) solar radiation into electrical energy, while long-wavelength (above 800nm) solar radiation is absorbed by the photovoltaic power generation layer 4 and converted into heat energy. The remaining sunlight shines on the radiation cooling layer 5 through the glass shell 2. The reflective layer 52 and the emitting layer 51 are a silver film and a lithium fluoride film, respectively. The solar reflectivity of the radiation cooling layer 5 is 0.953, the thermal emissivity is 0.894, and the cooling power reaches 40W / m. 2 The reflector layer 52 reflects most of the sunlight that hits the radiation cooling layer 5 back into the atmosphere. The emitter layer 51 dissipates heat into the atmosphere through its own thermal radiation, causing the temperature of the cold end 64 of the sky-side thermoelectric power generation layer, which is in contact with the reflector layer 52, to decrease to near or even below the ambient air temperature. The photovoltaic power generation layer 4 absorbs long-wave solar radiation and converts it into heat energy, which is transferred to the hot end 65 of the concentrator-side thermoelectric power generation layer, raising its temperature. The hot end 65 of the concentrator-side thermoelectric power generation layer transfers the heat to the cold end 66 of the concentrator-side thermoelectric power generation layer, and uses the Seebeck effect to convert some of the heat into electrical energy. The cold end 66 of the concentrator-side thermoelectric power generation layer transfers the heat energy to the evaporator end 71. The working fluid inside the evaporator end 71 absorbs heat through evaporation and transfers it to the condenser end of the heat pipe 7, and then cools it. The condensation of the working fluid inside the condenser end dissipates heat, lowering the temperature of the cold end 66 of the thermoelectric generator layer on the concentrator side. The evaporation end 71 transfers heat to the hot end 63 of the thermoelectric generator layer on the sky side, raising its temperature. The hot end 63 of the thermoelectric generator layer on the sky side transfers heat to the cold end 64 of the thermoelectric generator layer on the sky side, and uses the Seebeck effect to convert some of the heat into electrical energy. The cold end 64 of the thermoelectric generator layer on the sky side transfers heat to the reflector layer 52. At night, when there is no sunlight, the radiation cooling layer 5 uses its high thermal emissivity and the low temperature cold source characteristics of outer space to dissipate its own heat through thermal radiation, lowering its temperature. The cold end 64 of the thermoelectric generator layer on the sky side transfers heat to the radiation cooling layer 5, making its temperature lower than that of the hot end 63 of the thermoelectric generator layer on the sky side, and uses the Seebeck effect to generate electrical energy.

[0043] In summary, the embodiments of the present invention provide a day-night radiation thermoelectric power generation device and method. Through the coupling between a heat pipe, a thermoelectric power generation layer, a photovoltaic power generation layer, and a radiation cooling layer, the photovoltaic power generation layer absorbs short-wave solar energy to generate electricity, while the thermoelectric power generation layer utilizes long-wave solar energy to generate electricity. Furthermore, the use of a trough concentrator to concentrate sunlight increases the power output of the integrated power generation device and reduces costs. The heat pipe quickly removes heat from the cold end of the thermoelectric power generation layer on the concentrator side, increasing the temperature difference between the hot and cold ends of the trough concentrator and reducing the temperature of the photovoltaic power generation layer. This effectively improves the power generation efficiency of the photovoltaic thermoelectric integrated power generation device, utilizes the full spectrum of solar energy, efficiently generates electricity from solar energy, is energy-saving and environmentally friendly, effectively improves photoelectric conversion efficiency, and achieves continuous day-night power generation, thus broadening practical application scenarios.

[0044] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A diurnal radiation thermoelectric power generation device, characterized in that, The system includes a trough concentrator (1), a glass shell (2), a photovoltaic power generation layer (4), a radiation cooling layer (5), a thermoelectric power generation layer (6), and a heat pipe (7). The trough concentrator (1) is located below the heat pipe (7), which is positioned at the focusing center of the trough concentrator (1). The portion of the heat pipe (7) at the focusing center of the trough concentrator (1) is the evaporation end (71). The thermoelectric power generation layer (6) is mounted on the heat pipe (7) and includes a sky-side thermoelectric power generation layer (62) and a concentrator. The concentrator-side thermoelectric power generation layer (61) has its outer side facing the sky, and the radiation cooling layer (5) is disposed on the outer side of the sky-side thermoelectric power generation layer (62). The outer side of the concentrator-side thermoelectric power generation layer (61) faces the trough concentrator (1), and the photovoltaic power generation layer (4) is disposed on the outer side of the concentrator-side thermoelectric power generation layer (61). The glass shell (2) is fitted onto the photovoltaic power generation layer (4) and the radiation cooling layer (5). The trough concentrator (1), the glass shell (2), and the photovoltaic power generation layer are all present. (4) The radiative cooling layer (5), the thermoelectric power generation layer (6), and the heat pipe (7) are all coaxially arranged; wherein, the sky-side thermoelectric power generation layer (62) includes a sky-side thermoelectric power generation layer hot end (63) and a sky-side thermoelectric power generation layer cold end (64), the sky-side thermoelectric power generation layer cold end (64) is attached to the inner side of the radiative cooling layer (5), the sky-side thermoelectric power generation layer hot end (63) is attached to the evaporation end (71), the concentrator-side thermoelectric power generation layer (61) includes a concentrator-side thermoelectric power generation layer hot end (65) and a concentrator-side thermoelectric power generation layer cold end (64). The concentrator-side thermoelectric power generation layer has a cold end (66) and a hot end (65) that is attached to the inner side of the photovoltaic power generation layer (4). The concentrator-side thermoelectric power generation layer has a cold end (66) that is attached to the evaporation end (71). The radiation cooling layer (5) includes a reflective layer (52) and an emitting layer (51). The reflective layer (52) is located closer to the heat pipe (7). The emitting layer (51) is fitted on the outer side of the reflective layer (52). The outer surface of the cold end (64) of the sky-side thermoelectric power generation layer is attached to the inner surface of the reflective layer (52).

2. The diurnal radiation thermoelectric power generation device according to claim 1, characterized in that, The thermoelectric power generation layer (6) also includes P-type thermoelectric leg blocks (8) and N-type thermoelectric leg blocks (9). The inner cross-sectional area of ​​the P-type thermoelectric leg blocks (8) and N-type thermoelectric leg blocks (9) is smaller than the outer cross-sectional area. The P-type thermoelectric leg blocks (8) and N-type thermoelectric leg blocks (9) are arranged at intervals along the circumference.

3. The diurnal radiation thermoelectric power generation device according to claim 1, characterized in that, A vacuum layer (3) is formed by evacuating the glass shell (2) between the photovoltaic power generation layer (4) and the radiation cooling layer (5).

4. A diurnal radiation thermoelectric power generation device according to any one of claims 1-3, characterized in that, The photovoltaic power generation layer (4), the radiation cooling layer (5), the thermoelectric power generation layer (6), and the heat pipe (7) are all bonded together with insulating thermally conductive silicone grease.

5. A method for generating electricity based on the diurnal radiation thermoelectric power generation device according to claim 1, characterized in that the steps include... include: During the daytime, sunlight shines on the trough concentrator (1), which reflects and focuses the incident sunlight through the glass shell (2) onto the surface of the photovoltaic power generation layer (4). The remaining sunlight shines through the glass shell (2) onto the radiative cooling layer (5). The reflective layer (52) reflects most of the sunlight that hits the radiative cooling layer (5) into the atmosphere. The emitting layer (51) dissipates heat into the atmosphere through its own thermal radiation, causing the temperature of the cold end (64) of the sky-side thermoelectric power generation layer, which is in contact with the reflective layer (52), to decrease. The photovoltaic power generation layer (4) absorbs long-wave solar radiation and converts it into heat energy, which is transferred to the hot end (65) of the concentrator-side thermoelectric power generation layer, causing its temperature to rise. The hot end (65) of the concentrator-side thermoelectric power generation layer transfers the heat to the cold end (66) of the concentrator-side thermoelectric power generation layer, converting some of the heat into electrical energy. The cold end (66) of the concentrator-side thermoelectric power generation layer... 6) The heat energy is transferred to the evaporation end (71). The working fluid inside the evaporation end (71) absorbs heat through evaporation and transfers it to the condensation end of the heat pipe (7). The heat is dissipated through the condensation of the working fluid inside the condensation end, which lowers the temperature of the cold end (66) of the concentrator-side thermoelectric power generation layer. The evaporation end (71) transfers heat to the hot end (63) of the sky-side thermoelectric power generation layer, which raises its temperature. The hot end (63) of the sky-side thermoelectric power generation layer transfers heat to the cold end (64) of the sky-side thermoelectric power generation layer, converting some of the heat into electrical energy. The cold end (64) of the sky-side thermoelectric power generation layer transfers heat to the reflective layer (52). When there is no sunlight at night, the radiative cooling layer (5) dissipates its own heat through thermal radiation, which lowers its temperature. The cold end (64) of the sky-side thermoelectric power generation layer transfers heat to the radiative cooling layer (5), making its temperature lower than that of the hot end (63) of the sky-side thermoelectric power generation layer, thus generating electrical energy.

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