CN201368606Y - Flat-plate solar energy photovoltaic electricity-heat conversion device by adopting heat pipe to cool - Google Patents

Abstract

The utility model relates to a flat-plate solar photovoltaic electric-heat conversion device which adopts heat pipe cooling, and belongs to the field of solar photovoltaic electric-heat utilization engineering. It is mainly composed of solar photovoltaic cell modules, solar photovoltaic panels, glass cover plates, glass side seals, liquid-absorbing core heat pipes, heat-conducting materials, thermal insulation materials, cooling fluid channels, cooling fluid inlet and outlet headers and connecting pipes. The evaporation section of the liquid-absorbing wick heat pipe is in close contact with the photovoltaic panel, and the gap between the two is filled with heat-conducting materials with excellent thermal conductivity; insulation materials are arranged around the evaporation section of the liquid-absorbing wick heat pipe and the heat-conducting material; in the condensation section of the liquid-absorbing wick heat pipe Radial fins are arranged on the outer surface; a heat insulation section is left between the evaporation section and the condensation section of the heat pipe of the liquid-absorbing core, and the outer surface of the heat insulation section is arranged with thermal insulation materials; the whole device can be arranged obliquely. The utility model has the characteristics of uniform temperature of the solar photovoltaic battery board, convenient adjustment of the working temperature, high photovoltaic electric-thermal conversion efficiency and good operation reliability.

Description

A flat-plate solar photovoltaic power-to-heat conversion device cooled by heat pipes

Technical field:

The name of the utility model is a flat-plate solar photovoltaic electric-thermal conversion device cooled by a heat pipe, which belongs to the field of solar photovoltaic electric-thermal utilization engineering.

Background technique:

Among the heat utilization methods of solar energy, the photovoltaic power utilization of solar energy is one of the more common methods at present. At present, there have been many studies on the utilization of photovoltaic electricity from solar energy, but the utilization efficiency of photovoltaic electricity from solar energy is low, generally only 10-20%. At the same time, the thermal energy that is not converted into electrical energy will also cause the temperature of the photovoltaic cell to rise, and according to the research, the conversion efficiency of the solar photovoltaic cell decreases with the increase of the conversion temperature, which is more unfavorable for the photovoltaic conversion of solar energy. According to the research The heating of solar photovoltaic cells by this excess heat will cause the conversion efficiency to drop by 3 to 6%, so it is necessary to cool them. Through cooling, on the one hand, the photoelectric conversion efficiency of solar energy can be improved; The excess heat is recovered and used as heat, such as refrigeration, heating, desalination and steam generation, so there are photovoltaic electric-thermal conversion devices and systems for solar energy.

Judging from the literature and patent authorization at home and abroad, most of the cooling systems used in the solar photovoltaic power conversion process are forced convection cooling and natural convection cooling. effective way. However, it should be pointed out that the temperature of the cooling medium rises after absorbing the heat of the solar photovoltaic cell panel during the flow process, and due to the equal heat flux density of the solar radiation, the uneven distribution of the cooling fluid and the internal heat transfer of the solar photovoltaic electric-thermal system Thermal complexity (there are three heat transfer methods of heat conduction, convection and radiation heat transfer), at this time, the temperature of the solar photovoltaic cell panel should not be uniform, that is, the operating temperature of the solar photovoltaic cell is along the flow direction of the fluid It should be increased, so the cooling effect of solar photovoltaic cells on the solar photovoltaic panel is uneven, and sometimes even "hot spot" problems occur, which is not good for improving the photoelectric conversion efficiency of solar photovoltaic cells; at the same time, due to the working of solar photovoltaic cells The inhomogeneity of temperature also brings inconvenience to the adjustment of the working temperature of the solar photovoltaic electro-thermal system; in addition, when the traditional cooling method uses cooling medium such as air, it needs to use enhanced heat transfer to improve the cooling effect. However, the current method of adding fins in the cooling medium channel will obviously increase the complexity and investment cost of the system, which is also detrimental to the improvement of the economic performance of the solar photovoltaic electro-thermal system. Therefore, it is necessary to adopt a new cooling method, which can not only achieve high-efficiency cooling effect, but also keep the working temperature of each solar photovoltaic cell on the solar photovoltaic panel uniform, and the working temperature can be adjusted easily, which is very important for improving solar photovoltaic power generation. - The overall performance of the thermal system, especially the photoelectric conversion performance of solar energy is very favorable.

Utility model content:

The technical problem to be solved by the utility model is to provide a high-efficiency flat-plate solar photovoltaic electro-thermal conversion device cooled by heat pipes. On the one hand, make full use of the isothermal performance of the heat pipe and the convenient adjustability of the working temperature; - The problem of uneven temperature and "hot spots" of solar photovoltaic panels in the thermal system can improve the conversion efficiency and safety performance of photovoltaic electric-thermal systems, and can also realize the convenient adjustability of the operating temperature of solar photovoltaic cells.

In order to solve the above technical problems, the utility model is realized through the following technical solutions:

It mainly consists of solar photovoltaic cell module 1, solar photovoltaic panel 2, glass cover plate 7, glass side seal 6, liquid-absorbing core heat pipe 4, heat-conducting material 3, liquid-absorbing core heat pipe evaporation section insulation material 5, liquid-absorbing core heat pipe insulation section Insulation material 8, cooling fluid channel 12, cooling fluid inlet header 13, cooling fluid outlet header 10, cooling fluid inlet connecting pipe 14 and cooling fluid outlet connecting pipe 9 are composed of a heat pipe-cooled flat-plate solar photovoltaic power-to-heat conversion The device is characterized in that: the glass cover plate 7 and the glass side seal 6 form a closed space with a greenhouse effect, the solar photovoltaic cell modules 1 are arranged in a regular rectangular manner on the solar photovoltaic cell panel 2, and each row of solar photovoltaic cell modules 1 The evaporation section of the liquid-absorbing wick heat pipe 4 is arranged below, and the evaporation section of the liquid-absorbing wick heat pipe 4 is in close contact with the solar photovoltaic panel 2, and the heat-conducting material 3 with excellent thermal conductivity is filled between the two; The heat-conducting material 3 is arranged around the liquid-absorbing core heat pipe evaporation section thermal insulation material 5; the outer surface of the condensation section of the liquid-absorbing core heat pipe 4 is arranged with radial fins 11; between the evaporation section and the condensation section of the liquid-absorbing core heat pipe The heat insulation section, and the outer surface of the heat insulation section of the liquid-absorbing core heat pipe is arranged with the thermal insulation material 8 of the heat-insulation section of the heat-absorbing core heat pipe, and the condensation section of the heat pipe of the liquid-absorbing core is arranged in the cooling fluid channel 12; the inlet end of the cooling fluid channel is arranged with a cooling fluid inlet connection A tank 13 and a cooling fluid inlet connection 14; a cooling fluid outlet header 10 and a cooling fluid outlet connection 9 are arranged at the outlet end of the cooling fluid passage.

The utility model arranges radial fins 11 on the outer surface of the condensation section of the liquid-absorbing core heat pipe to effectively improve the heat transfer effect of the cooling fluid, and the entire device can use the evaporation section of the liquid-absorbing core heat pipe 4 to better receive solar radiation The inclined arrangement of the bottom and the condensation section on the top.

Compared with the prior art, the utility model has the following characteristics: (1) the isothermal performance of the heat pipe makes the working temperature of each solar photovoltaic cell the same, and the temperature of the surface of the solar photovoltaic cell panel is uniform, thereby improving the photoelectric conversion of the whole device Efficiency and effective avoidance of "hot spot" problems on solar photovoltaic panels, good operational reliability. (2) Utilizing the convenient and adjustable working temperature of the heat pipe, the working temperature of the solar photovoltaic cell of the whole device can be adjusted according to the needs by changing the external working conditions of the heat pipe, such as the temperature and flow rate of the cooling fluid, etc. to adjust the working temperature of the solar photovoltaic cell Purpose. (3) High heat exchange efficiency: high-efficiency liquid-absorbing core heat pipes are used, and radial fins are installed in the condensation section of the liquid-absorbing core heat pipes, and the outer surface of the liquid-absorbing core heat pipe insulation section is arranged with insulation materials for the liquid-absorbing core heat pipe insulation section 8 , the condensing section of the liquid-absorbing core heat pipe is arranged in the cooling fluid channel 12; the inlet end of the cooling fluid channel is arranged with a cooling fluid inlet header 13 and a cooling fluid inlet connecting pipe 14; the outlet end of the cooling fluid channel is arranged with a cooling fluid outlet header 10 and Cooling fluid outlet connection 9.

The working process of the utility model is as follows: when the solar radiation irradiates the glass cover plate 7 on the photovoltaic electro-thermal conversion device, the solar energy penetrates the glass cover plate 7 and enters the enclosed space composed of the glass cover plate 7 and the glass side seal 6, Using the greenhouse effect of the closed space, the solar energy entering the closed space is absorbed by the solar photovoltaic cell module 1 and converted into electrical energy on the one hand, and on the other hand, the solar photovoltaic cell panel 2 is heated, and part of the heat passes through the glass cover plate 7 and the glass side seal 6. Dissipate by convection and radiation; after the solar photovoltaic cell panel 2 is heated, the heat passes through the solar photovoltaic cell panel 2 in the form of heat conduction, except for a small part of the heat, which is lost to the outside world through the thermal insulation material 5 of the evaporation section of the liquid-absorbent heat pipe In and out of the environment, most of it is transferred to the thermally conductive material 3 with excellent thermal conductivity between the evaporation section of the liquid-absorbing wick heat pipe 4 and the solar photovoltaic panel 2, and then passed to the tube wall of the evaporation section of the liquid-absorbing wick heat pipe 4; After the evaporation section of the wick heat pipe 4 is heated, the working fluid in the heat pipe absorbs heat and vaporizes, and the vaporized working medium flows upwards through the adiabatic section of the liquid-absorbing wick heat pipe 4 and then reaches the condensation section of the liquid-absorbing wick heat pipe 4; The working medium of the liquid core heat pipe 4 releases heat to the cooling fluid outside the tube of the condensation section and condenses into a liquid working medium. When the device is placed obliquely, the liquid working medium is subjected to gravity, and flows back to the evaporating section of the liquid-absorbing core heat pipe 4 through the adiabatic section of the liquid-absorbing core heat pipe 4, and re-absorbs heat and vaporizes; while the cooling fluid enters the cooling fluid through the cooling fluid inlet connecting pipe 14 After the fluid inlet header 13 enters the cooling fluid passage 12, in the cooling fluid passage 12, the cooling fluid absorbs heat from the liquid-absorbing core through convective heat exchange with the radial fins 11 of the condensation section of the liquid-absorbing core heat pipe 4. The heat of condensation of the heat pipe 4 flows out through the cooling fluid outlet header 10 and the cooling fluid outlet connecting pipe 9 after reaching the required temperature.

Claims (2)

1. A flat-plate solar photovoltaic electric-thermal conversion device cooled by heat pipes, mainly composed of a solar photovoltaic cell module (1), a solar photovoltaic cell panel (2), a glass cover plate (7), a glass side seal (6), Liquid-absorbing core heat pipe (4), heat-conducting material (3), liquid-absorbing core heat pipe evaporation section insulation material (5), liquid-absorbing core heat pipe insulation section insulation material (8), cooling fluid channel (12), cooling fluid inlet header (13), composed of cooling fluid outlet header (10), cooling fluid inlet nozzle (14) and cooling fluid outlet nozzle (9), characterized in that: the glass cover plate (7) and the glass side seal (6) form a closed In space, the solar photovoltaic cell modules (1) are arranged in a regular rectangular manner on the solar photovoltaic cell panels (2), and the evaporation section of the liquid-absorbing wick heat pipe (4) is arranged under each row of solar photovoltaic cell modules (1), and the liquid-absorbent The evaporation section of the wick heat pipe (4) is in close contact with the solar photovoltaic panel (2), and the space between them is filled with a heat-conducting material (3) with excellent thermal conductivity; the evaporation section of the liquid-absorbing wick heat pipe (4) and the heat-conducting material (3) The insulation material (5) for the evaporating section of the liquid-absorbing wick heat pipe (4) is arranged around; a heat-insulating section is left between the evaporating section and the condensing section of the liquid-absorbing wick heat pipe (4), and the outer surface of the heat-insulating section of the liquid-absorbing wick heat pipe (4) is arranged There is thermal insulation material (8) for the thermal insulation section of the liquid-absorbing core heat pipe (4), and the condensation section of the liquid-absorbing core heat pipe (4) is arranged in the cooling fluid passage (12); the inlet end of the cooling fluid passage is arranged with a cooling fluid inlet header (13) and a cooling A fluid inlet joint (14); a cooling fluid outlet header (10) and a cooling fluid outlet joint (9) are arranged at the outlet end of the cooling fluid passage. 2. A flat-plate solar photovoltaic electro-thermal conversion device cooled by heat pipes according to claim 1, characterized in that radial fins (11) are arranged on the outer surface of the condensation section of the liquid-absorbing core heat pipe (4) , and the whole device can adopt the oblique arrangement with the evaporating section on the bottom and the condensing section on the top of the liquid-absorbing wick heat pipe (4).

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