线性菲涅耳型太阳能聚光光热系统实验研究

Experimental Study of Linear Fresnel Type Solar Thermal System

在已提出的线性菲涅耳型平面镜反射太阳能聚光系统的基础上,以金属-玻璃真空集热管为太阳能热接收器,建立了一套理论聚光比为34.86的太阳能光热实验系统。对于东西向固定的一维跟踪线聚焦集热系统,由于端头效应,集热管的有效接收长度随太阳入射角度变化,本文分析了多根集热管串联端头效应的影响。实验结果表明,该聚光光热系统在进行端头效应修正后的光热利用转换效率为0.73,与理论分析结果一致。

On the basis of proposed linear Fresnel type solar concentrating system with glass mirror reflectors, a solar thermal system with concentrating ratio of 34.86 is setup for experimental study, in which the metal glass vacuum tube is employed as the solar thermal receiver. For the linear concen- trating solar thermal system with axis fixed in the East-West direction, the effective receive length of the receivers would change with the incident angle of solar light because of the end effect, which is the oretically analyzed in this work. The experimental results indicated that the thermal efficiency of this system is about 73% after the correction of the end effect, which agrees well with the theoretical result.