分段式槽式太阳能聚光器的性能分析

PERFORMANCE ANALYSIS OF SEGMENTED PARABOLIC TROUGH SOLAR CONCENTRATOR

提出一种新型的分段式槽式太阳能聚光器,通过在平面框架上放置同焦线的多块抛物面反射镜面,将光线聚集于焦线处,使用平板型集热器或圆柱型集热器作为接收体,用于太阳能聚光光热利用。该聚光器由于采用分段式的抛物反射镜,因此相比传统槽式聚光器具有较小的风阻,较低的镜面高度,并同时可达到较高的聚光倍数。根据几何光学原理给出确定每块抛物镜面尺寸及位置的曲线方程,并根据各器件实测的光学性质对聚光器进行理论分析计算,结果表明该聚光器具有较高的集热效率。

A novel segmented parabolic trough solar concentrator was presented for solar energy photo-thermal utilization, in which several segmented parabolic mirror reflectors with the same focal line were fixed to a flat frame. It can generate a concentrated radiation on a flat panel solar thermal collector or a tube solar thermal collector, which covert solar energy into thermal energy. Compared to the traditional parabolic trough concentrator, the proposed concentrator has a lower wind resistance and a lower mirror height because of the segmented parabolic mirrors, and also can reach a similar high concentration ratio. The parabola formulas of mirror reflectors were derived to determine their sizes and positions based on the principle of geometrical optics. According to the experimental results of every components of the concentrator, the theoretical performance of the segmented parabolic trough solar concentrator was investigated and analyzed. The resuhs showed that it has a high thermal efficiency.