Characteristics analysis and study of a segmented reflection solar concentrator

Abstract

In this paper, a segmented specular reflection solar concentrator is proposed. Many mirrors are arranged in the same plane, and all the reflected rays fall on the cylindrical focal surface. The glass mirrors are placed in different positions and with different tilt angles and widths, and reflect light without blocking each other. Through the theoretical analysis of this type of concentrating system, in the same space span, with the increase of the installation height of the cylindrical focal surface, the concentrating ratio and area utilisation rate gradually increase. The area utilisation ratio is related to the ratio of mirror installation span and receiver height, and the concentrating ratio has a linear relationship with the number of mirrors. Through photothermal experimental analysis, it was established that the size of liquid flow in the pipeline has basically no influence on the photothermal conversion efficiency of the concentrator system. The greater the radiation intensity received in the heat collecting tube, the higher the heat collection efficiency of the solar collecting system. As the effective heat collection length gradually decreases, the ambient temperature gradually decreases and the heat dissipation of the collector tube increases, so that the heat collection efficiency decreases significantly.