Concentrating type full-spectrum solar photovoltaic photo-thermal combination system

Abstract

A concentrating type full-spectrum solar photovoltaic photo-thermal combination system comprises a main concentrator (1), a heat collecting pipe (2), a secondary concentrator (3), a photovoltaic device (4), a cooling device (5) and a support (6). The heat collecting pipe (2) and the secondary concentrator (3) are located at the focusing position of the main concentrator (1), the secondary concentrator (3) is fixed to the position above the main concentrator (1) through the support (6), the main concentrator (1) reflects and focuses solar radiation on the heat collecting pipe (2) and the secondary concentrator (3), and the secondary concentrator (3) reflects and focuses solar radiation on the heat collecting pipe (2). The photovoltaic device (4) is located on the inner wall surface of the secondary concentrator (3), and a back reflecting layer (8) of the photovoltaic device (4) reflects ultraviolet light and near-infrared light which cannot be absorbed and utilized by a photovoltaic cell layer (7) in sunlight to the heat collecting pipe (2) again. The cooling device (5) is located on the back face of a substrate (9) of the photovoltaic device (4) and used for cooling the photovoltaic device (4).

Description

technical field [0001] The invention relates to a solar energy utilization device, in particular to a solar photovoltaic photothermal combined system. Background technique [0002] At present, the field of solar power generation mainly includes photovoltaic power generation technology and photothermal power generation technology. According to the current development status of solar power generation technology, concentrating technology is the most important method to improve the power generation efficiency of these two technologies. It can not only reduce the occupied area, but also reduce the cost of power generation. However, the two technologies currently have their own advantages and disadvantages. From the perspective of power generation efficiency, photothermal power generation technology has significantly improved power generation efficiency by concentrating light. However, compared with photovoltaic power generation, although it can absorb and convert the energy of th...

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Problems solved by technology

[0003] Chinese patent 201210250372.0 discloses a "back reflective solar cell and its manufacturing method", which consists of a protective bottom layer, a reflective dielectric film sequentially arranged on the surface of the protective bottom layer, a back electrode and a battery film. The sunlight of the solar cell is reflected to the battery for reuse, but this patent can only use the visible light part of the solar spectrum, and the rest of the ultraviolet light and near-infrared light are also reflected and cannot be used.

[0004] Chinese patent 201210058376.9 discloses a "vacuum tube photovoltaic photothermal composite parabolic concentrator", which combines a composite parabolic concentrator with photovoltaic power generation to focus and reflect sunlight to photovoltaics to generate electricity, and uses cooling tubes to cool photovoltaics and generate electricity. Hot water, the system does not need tracking, and realizes the comprehensive utilization of photovoltaics, light and heat. However, due to the low concentration ratio of the system and no tracking system, it is difficult to achieve high temperature applications

Another Chinese patent 201510272091.9 discloses "a full-spectrum photovoltaic photothermal combined system", which uses a concentrating frequency division device to separate ultraviolet light and near-infrared light from visible light in sunlight, and irradiates the visible light part to photovoltaic The battery generates electric energy, and the rest is reflected and focused into the heat collecting device to generate heat energy. However, the concentrating photovoltaic device used in this system is an ordinary photovoltaic device, and its efficiency is difficult to improve. In addition, the concentrating frequency division device generally has many layers to achieve Spectral energy supply, its cost and optical efficiency need further analysis

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