High-efficiency low-cost solar cogeneration system

Abstract

The invention provides a high-efficiency and low-cost solar energy thermal-electric cogeneration system, comprising a condenser, a heat absorbing filter, and a photovoltaic cell; the shell of the heat absorbing filter is provided with a front transparent window plate and a rear transparent window plate; the average internal transmittance of the front transparent window plate and the rear transparent window plate is more than 80% / cm correspondingly to a solar ray with the wavelength of 400-2300nm; the front transparent window plate faces to the condenser; the focus of the condenser is positioned inside the internal chamber of the heat absorbing filter; the internal chamber of the heat absorbing filter is internally provided with heat mediums; the average transmittance of the heat mediums is more than 85% / cm correspondingly to the visible light with the wavelength of 400-760nm; the average absorption ratio of the heat mediums is more than 20% / cm corresponding to the infrared light with the wavelength of 1150-2300nm; the back surface of the rear transparent window plate is provided with a cell bin which is internally provided with a photovoltaic cell; the distance between the front transparent window plate and the rear transparent window plate is 10-120mm. The high-efficiency and low-cost solar energy thermal-electric cogeneration system adopts simple structures and simple heat medium, effectively solves the difficult problem of temperature reduction of the photovoltaic cell, excellently matches with the sensitive characteristic area of the photovoltaic cell, leads the full spectral coverage of the solar spectrum to generate power or heat correspondingly without waste, and greatly improves the productivity of the solar energy.

Description

technical field [0001] The invention relates to a solar energy utilization device, in particular to a high-efficiency, low-cost, full-spectrum cogeneration system for fully utilizing solar energy. Background technique [0002] Fossil fuels such as petroleum, natural gas, and coal are non-renewable primary energy sources, and their reserves are limited. Based on the current mining volume, they will be exhausted in a few decades. Due to the shortage of primary energy supply and rising prices, it has become a It is a major issue of common concern to the international community. In order to cope with the shortage of primary energy, countries all over the world are actively seeking to develop new energy and make efficient use of it. The most important thing is solar power generation. [0003] If the solar energy received by the earth in 40 minutes is fully utilized, it is enough for the energy consumption of the whole world for one year. The solar radiation spectrum that can be ...

AI Technical Summary

Problems solved by technology

[0006] However, after the sunlight is concentrated, the energy density is greatly increased, and the temperature at the focal spot is as high as several hundred degrees. Since the photoelectric conversion efficiency of crystalline silicon photovoltaic cells decreases linearly with the increase of temperature after 25 degrees, the long-term high temperature may also decrease. Lifetime of crystalline silicon photovoltaic cells

Therefore, it is necessary to find a method with low cost, simple method and good effect to reduce the surface temperature of photovoltaic cells, and convert this part of heat into high-grade electric energy while reducing the temperature, so as to maximize the comprehensive utilization rate and energy grade of solar energy It has become a key technology for high-efficiency and low-cost solar concentrated power generation. The existing technology has high cooling costs for photovoltaic cells and complex methods; no thermoelectric conversion devices are used to further improve power generation efficiency, and the overall cost performance is still lacking in competition. power, it is impossible to replace thermal power generation with large-scale concentrated solar power generation, and promote it to thousands of households

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