Development of a faceted concentrator for a combined photovoltaic plant
Energy saving. Power engineering. Energy audit.(2022)
Abstract
This article examines the features of solar energy concentrators. The characteristics of the currently existing types of solar energy concentration systems are given: a weak concentration system and a high concentration system. Their design features and shortcomings are given. It is noted that Frenel lenses are one of the most widely used concentrators, but their optical efficiency is limited by low or high temperatures, as a change in the refractive index or deformation of the Frenel lens structure is observed due to thermal expansion. Fresnel lenses, which focus solar radiation on an area of up to 1 cm 2, do not allow the utilization of excess thermal energy. The complex geometric shape of parabolic concentrators determines the expensive technology of their manufacture, which, in turn, significantly increases the cost of the electric energy produced by them. Luminescent solar concentrators have a low coefficient of concentration of solar energy. The conducted analysis showed that the existing concentrators of solar radiation do not allow to create competitive compared to traditional sources of electrical energy photo-energy installations that work at high levels of concentration of solar radiation and utilize excess thermal energy. In order to solve the mentioned problems, the authors developed a faceted concentrator of solar radiation, gave its characteristics and presented a laboratory sample. Questions of optimization of the adjustment of the concentrator are investigated. A report on the mock-up tests conducted has been published.
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