低截取比下复合抛物面聚光器的光热性能

Photothermal Properties of Compound Parabolic Concentrator Under Low Interception Ratio

考虑复合抛物面聚光器(CPC)的经济性和光学性能,对CPC结构进行了优化设计。根据参数方程,分析了相同面积内的截取比对CPC总弧长和接收管数量的影响。研究结果表明,CPC截取比取0.15～0.25时,可有效降低对CPC弧面材料的使用。基于Tracepro软件,实现了对CPC的二维光线追踪,提出了一种CPC直射光学效率的模拟计算方法。选择1月1日、4月1日、7月1日、10月1日四个季节日期为模拟日期,模拟结果显示,截取比为0.16的CPC相较于截取比为0.56的CPC,平均直射光学效率分别提高了13.77%,15.24%,9.30%,11.54%。太阳高度角的增加和方位角的减小有利于降低CPC的末端光线损失。增加CPC的长度有利于减小末端光线损失对CPC光学效率的影响。实验测试验证了模拟的正确性,所提方法可应用于以提高光学性能为目标的CPC结构优化设计。

Aiming at the economic and optical performances of the compound parabolic concentrator(CPC),the CPC structural design is optimized.According to the parameter equation,the effect of the intercept ratio for the same area on the total CPC arc length and the number of receiving tubes is analyzed.The research results show that an intercept ratio value of 0.15-0.25 for CPC can effectively reduce the use of CPC arc surface material.Based on the Tracepro software,twodimensional ray tracing of CPC is implemented,and a simulation and calculation method for the direct optical efficiency of CPC is proposed.Four seasonal dates,January 1,April 1,July 1,and October 1,are selected as the simulation dates.The simulation results show that the average direct optical efficiencies of CPC with an interception ratio of 0.16 are 13.77%,15.24%,9.30%and 11.54% higher than those of CPC with an interception ratio of 0.56,respectively.The increase of solar altitude angle and the decrease of azimuth angle are both helpful to reduce the end ray loss of CPC.The increase of the CPC length is helpful to reduce the effect of terminal light loss on CPC optical efficiency.The experimental results confirm the correctness of the simulation ones.The proposed method can be applied to the optimization design of a CPC structure for the improvement of optical performances.