双轴跟踪槽式太阳能集热器实验研究

An Experimental Study on A Two-Axis Sun-track Parabolic Trough Collector

将双轴跟踪系统和国产集热管集成,研制了一套聚光比为24的双轴跟踪槽式太阳能集热器。对该集热器进行了实验研究,考察了集热器在不同流量下的集热性能,分析了其归一化效率和火用效率。结果表明:采用双轴跟踪,集热器的最高集热效率为80%,平均集热效率为48%-60%;随着流量的增加,集热效率略有降低;集热效率归一化线性良好,相关系数为0.973,热损失系数为1.693 W/(m2·K);集热器最佳工作温度为180℃,此时火用效率为0.15。

A two-axis sun-track PTC( parabolic trough collector) with a concentration ratio of 24 was set up,which integrated a two-axis sun-track PTC with domestic parabolic trough receiver. Thermal performance of this PTC was experimentally tested at different heat transfer fluid flow rates. In advance,the Normalized efficiency and energy efficiency were analyzed. The results show that,thermal efficiency of this two-axis tracking collector is 40% ~ 80%; and the thermal efficiency decreases slightly with the increase of flow rate. In addition,the linear of normalized efficiency is favorable,the linear correlation coefficient is 0. 973,and the heat loss coefficient is 1. 693 W /( m2·K); the optimum temperature value of the collector is 180 ℃,the energy efficiency is 0. 15.