Space photovoltaic and solar thermal temperature difference hybrid power generation system

Abstract

The present invention relates to a space photovoltaic and photothermal temperature difference hybrid power generation system, comprising a frame body, a Fresnel lens fixed to the top of the frame body, and a screw bracket fixed to the bottom of the frame body. A photovoltaic panel and a spectroscope frame are fixedly installed on one side of the frame body. The photovoltaic panel and the spectroscope frame are fixedly installed with the photovoltaic panel in the vertical direction, and the spectroscope is fixedly installed with the spectroscope in the horizontal direction. A heat dissipation plate is installed on the upper end of the screw bracket, and a temperature difference power generation module is arranged on the heat dissipation plate. The temperature difference power generation module is provided with a spherical cover with an inner reflector, and an optical fiber is inserted through the top of the spherical cover with the inner reflector. The Fresnel lens is used to focus light and the optical fiber is used for transmission to improve the light intensity. At the same time, the optical fiber illuminates the hot end of the temperature difference power generation module in a closed space with the inner reflector, and reflects the radiated light of the hot end of the thermoelectric generator back to the hot end of the thermoelectric generator, thereby reducing the radiation heat dissipation loss of the hot end of the thermoelectric generator and improving the power generation efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of space solar power generation, and relates to a space photovoltaic and photothermal temperature difference hybrid power generation system, and in particular to a photovoltaic power generation system with Fresnel lens focusing + spectroscope reflected light, and a photothermal temperature difference power generation system with Fresnel lens focusing + spectroscope transmitted light + optical fiber collection + internal reflector illumination. Background Art

[0002] As global energy crises and climate change pose increasingly severe threats to the sustainable development of human society, countries around the world are committed to developing clean energy such as solar energy and wind energy. Due to atmospheric scattering, cloud cover, and the alternation of day and night, the intensity of solar radiation on the Earth's surface is relatively low and fluctuates greatly. In comparison, the average solar radiation intensity in geosynchronous orbit reaches 1370W / m 2 The sheer size of the solar power plant has led researchers to propose a space-based solar power station and to conduct ground-based experiments and space-based verification studies. Traditionally, photovoltaic panels have been widely used for power generation due to their high efficiency (~26%). However, due to the direct effects of high-energy radiation and particles in space, photovoltaic panels experience a certain degree of performance degradation, shortened lifespan, and poor stability. Furthermore, because strong solar radiation can cause the panels to heat up to 100 to 200 degrees Celsius, their photoelectric conversion efficiency falls below the optimal value under laboratory conditions.

[0003] Considering that sunlight is primarily composed of visible light (approximately 50%), infrared light (approximately 43%), and ultraviolet light (approximately 7%), with visible light having a high photoelectric conversion efficiency, while infrared and ultraviolet light have very low photoelectric conversion efficiencies, researchers have proposed using a spectroscope to reflect the visible light in sunlight for photovoltaic power generation, while simultaneously using the infrared and ultraviolet light transmitted by the spectroscope for photothermal power generation. This approach can partially address the problem of overheating photovoltaic panels, thereby improving photovoltaic power generation efficiency. Furthermore, hybrid thermoelectric power generation can improve system power generation efficiency to a certain extent.

[0004] However, the above method uses infrared and ultraviolet rays transmitted by the spectroscope to directly illuminate the thermoelectric power generation module, which results in considerable heat loss. In particular, the radiative heat loss at the hot end of the thermoelectric generator leads to a theoretical limit to the hot end temperature of the thermoelectric generator. For example, according to the blackbody radiation law, the radiation intensity of a solid surface with an emissivity of ε and a surface temperature of T is 5.67×10 -8 ε(T+273.15) 4 If the emissivity of the solid surface is ε = 0.92, then when T = 121.11 ° C, the surface radiation intensity reaches 1370 W / m 2, which means that the theoretical limit of the hot-end temperature of the thermoelectric generator is only 121.11°C; if the heat conduction of the thermoelectric generator and the radiation heat dissipation of the cold end are taken into account, the theoretical limit of the hot-end temperature of the thermoelectric generator will be further reduced.

[0005] It can be seen that this method of using infrared and ultraviolet rays transmitted by a spectroscope to directly irradiate the thermoelectric power generation module for thermoelectric power generation has a large hot end radiation heat loss, and the hot end temperature is low, and the thermoelectric power generation efficiency is low. Summary of the Invention

[0006] In view of this, the present invention provides a space photovoltaic and solar-thermal thermoelectric hybrid power generation system to solve the problems of large radiation heat loss at the hot end, low hot end temperature and low thermoelectric efficiency in the current method of thermoelectric power generation using infrared and ultraviolet rays transmitted by a spectroscope to directly irradiate the thermoelectric power generation module.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The space photovoltaic and solar-thermal temperature difference hybrid power generation system includes a frame body, a Fresnel lens fixed to the top of the frame body and a screw bracket fixed to the bottom of the frame body. A photovoltaic panel and a spectrometer frame are fixedly installed on one side of the frame body. Photovoltaic panels are fixedly installed in the vertical direction of the photovoltaic panel and the spectrometer frame. Spectrometers are fixedly installed in the horizontal direction of the photovoltaic panel and the spectrometer frame. A heat dissipation plate is installed on the upper end of the screw bracket. A temperature difference power generation module is arranged on the heat dissipation plate. A spherical mask with an inner reflector is provided on the temperature difference power generation module. An optical fiber is inserted through the top of the spherical mask with an inner reflector.

[0009] The beneficial effect of this basic solution is that the use of Fresnel lens to focus light and optical fiber transmission can increase the light intensity. At the same time, the optical fiber illuminates the hot end of the thermoelectric power generation module in a closed space with an internal reflector, and reflects the radiation light from the hot end of the thermoelectric generator back to the hot end of the thermoelectric generator, thereby greatly reducing the radiation heat dissipation loss at the hot end of the thermoelectric generator and improving the power generation efficiency.

[0010] Furthermore, the frame body is composed of an upper frame and a lower frame which are parallel to each other and of the same size, and four upper and lower frame pillars connecting the upper frame and the lower frame.

[0011] Furthermore, the Fresnel lens is fixed to the upper frame by means of bolts.

[0012] Furthermore, the optical fiber is placed in the flexible wrapping tube, and the lower ends of the optical fiber and the flexible wrapping tube are inserted into the spherical mask with an inner reflector. The top of the spherical mask with an inner reflector is provided with a hole adapted to the flexible wrapping tube.

[0013] Furthermore, there are two screw brackets, which are respectively arranged in parallel in the lower end frame, and two screws for fixing the heat dissipation plate are fixedly installed on each screw bracket.

[0014] Furthermore, the screw rods for fixing the heat dissipation plate are inserted through the heat dissipation plate, and the screw rods for fixing the heat dissipation plate near the bottom surface of the heat dissipation plate are covered with nuts for fixing the heat dissipation plate. Advantageous effect: The position of the heat dissipation plate in the vertical direction can be adjusted by fixing the nuts for fixing the heat dissipation plate.

[0015] Furthermore, first bolt holes adapted to the screws for fixing the heat dissipation plate are provided at the four corners of the heat dissipation plate.

[0016] Furthermore, the outer surface of the spherical cover with an inner reflector is fixedly connected with a screw for fastening the spherical cover and its connector. The screw portion of the screw for fastening the spherical cover and its connector passes through the heat dissipation plate and is fixed by the nut for fastening the spherical cover.

[0017] Furthermore, a second bolt hole is provided on the heat dissipation plate and is adapted to the screw rod and the connector for fastening the spherical cover.

[0018] The beneficial effects of the present invention are:

[0019] The space photovoltaic and solar-thermal temperature difference hybrid power generation system disclosed in the present invention adopts a photovoltaic power generation system with Fresnel lens focusing + spectrometer reflecting light to reduce the temperature of photovoltaic panels and improve the efficiency of photovoltaic power generation; it is a space solar-thermal temperature difference power generation system with optical fiber collection and internal reflector illumination, and the infrared and ultraviolet rays transmitted by the spectrometer are collected by optical fiber. The optical fiber illuminates the hot end of the temperature difference power generation module in a closed cavity with an internal reflector, thereby greatly reducing the radiation heat loss of the hot end of the temperature difference power generation module, greatly increasing the temperature difference between the hot and cold ends of the temperature difference power generation module, and significantly improving the efficiency of temperature difference power generation.

[0020] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0022] Figure 1 This is an exploded diagram of the structure of the space photovoltaic and solar-thermal temperature difference hybrid power generation system of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the space photovoltaic and solar-thermal temperature difference hybrid power generation system after assembly of the present invention;

[0024] Figure 3This is a right side view of the space photovoltaic and solar-thermal temperature difference hybrid power generation system of the present invention;

[0025] Figure 4 This is a front view of the space photovoltaic and solar-thermal temperature difference hybrid power generation system of the present invention;

[0026] Figure 5 This is a top view of the space photovoltaic and solar-thermal temperature difference hybrid power generation system of the present invention.

[0027] Figure numerals: Fresnel lens 1, bolt 2, upper frame 3, photovoltaic panel and spectrometer frame 4, photovoltaic panel 5, pillars of upper and lower frames 6, temperature difference power generation module 7, heat dissipation plate 8, lower frame 9, spectrometer 10, optical fiber 11, flexible wrapping tube 12, spherical cover with internal reflector 13, screw for fastening the spherical cover and its connector 14, nut for fastening the spherical cover 15, nut for fixing the heat dissipation plate 16, screw for fixing the heat dissipation plate 17, screw bracket 18. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0029] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] like Figures 1 to 5 The space photovoltaic and solar-thermal temperature difference hybrid power generation system shown includes a frame body, a Fresnel lens 1 fixed to the top of the frame body, and a screw bracket 18 fixed to the bottom of the frame body. The frame body is composed of an upper frame 3 and a lower frame 9 that are parallel and of the same size, and four upper and lower frame pillars 6 connecting the upper frame 3 and the lower frame 9. The upper and lower frame pillars 6 are hollow cylinders. The Fresnel lens 1 is fixed to the upper frame 3 by bolts 2. The Fresnel lens 1 and the upper frame 3 can be square, rectangular or circular.

[0032] A photovoltaic panel and a spectroscope frame 4 are fixedly mounted on one side of the frame body, a photovoltaic panel 5 is fixedly mounted vertically on the photovoltaic panel and the spectroscope frame 4, and a spectroscope 10 is fixedly mounted horizontally on the photovoltaic panel and the spectroscope frame 4.

[0033] Two screw brackets 18 are arranged in parallel in the lower end frame 9, and each screw bracket 18 is correspondingly provided with two screws 17 for fixing the heat dissipation plate. The heat dissipation plate 8 is installed on the upper end of the screw bracket 18, and the screws 17 for fixing the heat dissipation plate pass through and penetrate the heat dissipation plate 8. The screws 17 for fixing the heat dissipation plate near the bottom surface of the heat dissipation plate 8 are provided with nuts 16 for fixing the heat dissipation plate. The position of the heat dissipation plate 8 in the vertical direction can be adjusted by fixing the nuts 16 for fixing the heat dissipation plate. The four corners of the heat dissipation plate 8 are provided with first bolt holes adapted to the screws 17 for fixing the heat dissipation plate.

[0034] A thermoelectric power generation module 7 is provided on the heat dissipation plate 8, and the area of ​​the heat dissipation plate 8 is larger than the area of ​​the thermoelectric power generation module 7. A spherical cover with an internal reflector is provided on the thermoelectric power generation module 7. An optical fiber 11 is inserted into the top of the spherical cover with an internal reflector. The optical fiber 11 is placed in a flexible wrapping tube 12. The lower ends of the optical fiber 11 and the flexible wrapping tube 12 are inserted into the spherical cover with an internal reflector 13. A hole that is compatible with the flexible wrapping tube 12 is opened at the top of the spherical cover with an internal reflector, and the inner surface of the spherical cover with an internal reflector has a reflective coating.

[0035] The outer surface of the spherical cover 13 with an internal reflector is fixedly connected with three screws for fastening the spherical cover and their connectors 14, and they form an angle of 120° between each other. The screws for fastening the spherical cover and the screw parts of the connectors 14 pass through the heat dissipation plate 8 and are fixed by the nuts 15 for fastening the spherical cover after passing through. The heat dissipation plate 8 is provided with a second bolt hole that is compatible with the screws for fastening the spherical cover and their connectors 14. When the projection of the temperature difference power generation module 7 on the horizontal plane is a square or rectangle, the spherical cover 13 with an internal reflector is a hollow cover in the form of a quadrangular pyramid with an internal reflector.

[0036] When the space photovoltaic and solar-thermal temperature difference hybrid power generation system is in use, sunlight in space is irradiated on the Fresnel lens 1 for concentration, and the spectroscope 10 reflects the visible light in the sunlight to the photovoltaic panel 5 for photovoltaic power generation. The infrared and ultraviolet rays transmitted by the spectroscope 10 are collected by the optical fiber at the end of the optical fiber 11 and then enter the spherical cover 13 with an internal reflector to irradiate the hot end of the thermoelectric power generation module 7 for solar-thermal temperature difference power generation. The light radiated from the hot end of the thermoelectric power generation module 7 is continuously reflected back to the hot end of the module by the spherical cover 13 with an internal reflector for reuse, thereby reducing the radiation heat loss of the hot end of the thermoelectric power generation module, significantly increasing the temperature of the hot end of the module, and increasing the temperature difference between the hot and cold ends of the thermoelectric power generation module, thereby achieving the purpose of improving the efficiency of thermoelectric power generation.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. Space photovoltaic and solar thermal temperature difference hybrid power generation system, characterized by: The invention comprises a frame body, a Fresnel lens fixed to the top of the frame body, and a screw bracket fixed to the bottom of the frame body. A photovoltaic panel and a spectroscope frame are fixedly mounted on one side of the frame body. A photovoltaic panel is fixedly mounted vertically on the photovoltaic panel and the spectroscope frame. A spectroscope is fixedly mounted horizontally on the photovoltaic panel and the spectroscope frame. A heat dissipation plate is mounted on the upper end of the screw bracket. A temperature difference power generation module is mounted on the heat dissipation plate. A spherical mask with an inner reflector is mounted on the thermoelectric power generation module. An optical fiber is inserted through the top of the spherical mask with an inner reflector. The frame body is composed of an upper frame and a lower frame that are parallel and of the same size, and four supporting columns of the upper and lower frames connecting the upper and lower frames; The optical fiber is placed in a flexible wrapping tube. The optical fiber and the lower end of the flexible wrapping tube are inserted into a spherical mask with an inner reflector. The top of the spherical mask with an inner reflector is provided with a hole adapted to the flexible wrapping tube.

2. The space photovoltaic and solar thermal temperature difference hybrid power generation system according to claim 1, characterized in that: The Fresnel lens is fixed on the upper end frame by bolts.

3. The space photovoltaic and solar thermal temperature difference hybrid power generation system according to claim 1, characterized in that: There are two screw rod brackets, which are respectively arranged in parallel in the lower end frame, and two screw rods for fixing the heat dissipation plate are fixedly installed on each screw rod bracket.

4. The space photovoltaic and solar thermal temperature difference hybrid power generation system according to claim 3, characterized in that: The screw rod for fixing the heat dissipation plate is inserted through the heat dissipation plate, and a nut for fixing the heat dissipation plate is sleeved on the screw rod at one end close to the bottom surface of the heat dissipation plate.

5. The space photovoltaic and solar thermal temperature difference hybrid power generation system according to claim 4, characterized in that: The four corners of the heat dissipation plate are provided with first bolt holes adapted to the screw rods for fixing the heat dissipation plate.

6. The space photovoltaic and solar-thermal temperature difference hybrid power generation system according to claim 1, characterized in that: The outer surface of the spherical cover with an inner reflector is fixedly connected with a screw rod and a connector for fastening the spherical cover. The screw rod and the connector of the screw rod pass through the heat dissipation plate and are fixed by a nut for fastening the spherical cover.

7. The space photovoltaic and solar thermal temperature difference hybrid power generation system according to claim 6, characterized in that: The heat dissipation flat plate is provided with a second bolt hole which is matched with the screw rod and the connecting head for fastening the spherical cover.

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