菲涅耳反射式太阳能聚光系统的三运动复合跟踪

摘要

A new tracking method of the linear Fresnel reflection type concentrator system (LFRC) was proposed.The secondary reflector placed over the receiver rotates at the same time with the mirror field's translation.Plane mirrors' rotation,secondary reflector's rotation and mirror field's translation together constituted a three-movement pattern.The cosine loss was decreased by way of the mirror field's translation so as to increase total efficiency of the system.The basis theoretical analysis and optical simulation showed that the total cosine loss of the three-movement system was unchanged basically through whole day.A 24 m2 mirror field system was tested practically.As a result,under good weather condition in summer,the increment of effective energy brought by three-movement system was greater about 5.8％,and the daily increment of energy was able to reach about 38 MJ.%提出了线性菲涅耳式太阳能反射聚光系统新的跟踪方式:置于接收器上方的二次聚光器配合镜场平移的同时进行旋转,与平面镜的转动组成三运动复合形式.通过镜场的整体平移减小余弦损失,提高系统整体的聚光集热效率.从理论分析和计算机模拟两个方面对这种三运动复合形式进行的研究发现,三运动系统的总余弦损失在一天中基本不变.对一个24 m2镜场的测试分析表明,在夏季晴天条件下,三运动复合系统的有效能量增加率约为5.8％,每天的能量增益达到38 MJ左右.