Gradient utilization device of line focusing concentrating photovoltaic-photothermal full spectrum

Abstract

The invention provides a gradient utilization device of a line focusing concentrating photovoltaic-photothermal full spectrum. Compared with the traditional concentrating photovoltaic technology, the device has the advantages that an upper layer collecting lens is provided, as only sunlight within an operating wavelength range of a concentrating photovoltaic battery but not all sunlight is subjected to photovoltaic utilization, the heat yield of the photovoltaic battery is reduced, and meanwhile the photoelectric conversion efficiency of the photovoltaic battery is enhanced; through medium temperature photothermal utilization, the photovoltaic-photothermal utilization grade is enhanced, so that the solar radiation utilization ratio is improved, full spectrum utilization of solar energy is realized, and irreversible loss during solar utilization is reduced.

Description

technical field [0001] The invention belongs to the technical field of solar energy utilization, and in particular relates to a line-focus concentrating photovoltaic-photothermal full-spectrum cascade utilization device. Background technique [0002] As the renewable energy with the largest reserves, solar energy has received extensive attention at home and abroad in recent years. Usually, solar energy is utilized in the form of photo-thermal conversion, photo-electric conversion, photo-chemical conversion and photo-biological conversion. In 2014, the International Energy Agency predicted that in 2050, solar power generation with light-to-heat conversion and light-to-electricity conversion as the core will account for 27% of the global installed capacity, of which light-to-heat conversion is mainly based on trough-type concentrating heat collection technology and tower-type concentrating Heat collection technology is the representative; light-to-electricity conversion is ma...

AI Technical Summary

Problems solved by technology

The existing full-spectrum solar power generation is mainly in the form of photovoltaic-waste heat and photovoltaic-thermoelectricity-waste heat. However, the waste heat of photovoltaic cells is low-grade heat. At the same time, there are problems of improper power and material matching between thermoelectric materials and photovoltaic cells, resulting in full solar energy. The spectrum utilization is irreversible and the utilization rate is low

[0004] There is a band gap in the photoelectric effect of photovoltaic cells, and electrons with energy lower than and higher than the band gap will be converted into low-grade waste heat. Since the working efficiency of photovoltaic cells is reduced by the increase of their own temperature, the utilization of solar energy can only be increased by increasing the temperature of waste heat rate space is limited

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