Solar energy concentrating frequency dividing photovoltaic photo-thermal cogeneration device

Abstract

The invention discloses a solar energy concentrating frequency dividing photovoltaic photo-thermal cogeneration device which comprises a composite paraboloid concentrator. First ultra clear glass, second ultra clear glass, an upper water channel and solar energy frequency dividing glass are configured in the composite paraboloid concentrator from top to bottom, a photovoltaic cell is configured below the solar energy frequency dividing glass and configured on a heat conducting silica gel, a lower water pipe is arranged below the heat conducting silica gel, and thermal insulation materials of the lower water pipe are configured on a bracket. When sunlight penetrates through the first ultra clear glass, an upper vacuum layer and the second ultra clear glass and near-infrared light in the sunlight irradiates the photovoltaic cell, by means of a sunlight frequency dividing technique, water working media in the upper water channel and the solar energy frequency dividing glass jointly absorb the near-infrared light and convert the near-infrared light to heat energy, the rest visible light irradiates the photovoltaic cell and is converted to electric energy and heat energy, the electric energy is supplied for users to use, and the heat energy is transmitted to the water working media in a lower water channel. According to the solar energy concentrating frequency dividing photovoltaic photo-thermal cogeneration device, photovoltaic photo-thermal cogeneration is achieved, and whole efficiencies of the device are improved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of photovoltaic light and heat, in particular to a solar energy concentrating frequency division photovoltaic light heat cogeneration device. Background technique [0002] For concentrators for photovoltaic / photothermal comprehensive utilization, the current concentrators mainly adopt trough, dish, spherical concentrating and Fresnel concentrating technologies, and these concentrating technologies cannot use the scattered light that accounts for 30% of solar energy; For trough, dish and spherical concentrators, since their focusing plane is on the upper side of the reflective surface, the photovoltaic cells installed at the focal plane will block part of the incident sunlight, reducing the utilization rate of solar energy and increasing The non-uniformity of sunlight reflected on the photovoltaic cells is not conducive to photoelectric conversion; the photovoltaic cells are suspe...

AI Technical Summary

Problems solved by technology

[0002] For concentrators for photovoltaic / photothermal comprehensive utilization, the current concentrators mainly adopt trough, dish, spherical concentrating and Fresnel concentrating technologies, and these concentrating technologies cannot use the scattered light that accounts for 30% of solar energy; For trough, dish and spherical concentrators, since their focusing plane is on the upper side of the reflective surface, the photovoltaic cells installed at the focal plane will block part of the incident sunlight, reducing the utilization rate of solar energy and increasing The non-uniformity of sunlight reflected on the photovoltaic cell is not conducive to photoelectric conversion; the photovoltaic cell is suspended above the reflective surface, the cooling system is inconvenient to install, the overall structure of the photovoltaic / photothermal system is not rigid enough, and the wind resistance is poor

[0003] For photovoltaic cells, the increase in the operating temperature of photovoltaic cells will lead to a decrease in photoelectric efficiency

According to statistics, the heat flux density of sunlight is 0.8kW / m 2 , when the operating temperature of photovoltaic cells is 20°C and the surface wind speed is 1m / s, for crystalline silicon cells, the photoelectric conversion efficiency decreases by 0.4-0.5% for every 1°C increase

At present, photovoltaic / photothermal comprehensive utilization devices mainly use direct sunlight on photovoltaic cells and install cooling systems on the back of photovoltaic cells. Since visible light, which accounts for 45% of solar energy, irradiates photovoltaic cells to generate electricity and heat, and near-infrared light, which accounts for 50% of solar energy, Light irradiation on photovoltaic cells only generates heat energy, so near-infrared light irradiation on photovoltaic cells greatly increases the thermal load and temperature rise of photovoltaic cells, reduces the power generation efficiency of photovoltaic cells, and increases the cooling capacity of photovoltaic cells

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