为提高复合抛物面集热器（CPC）太阳能利用率,基于光线追迹原理,建立无真空、玻璃盖板式及真空管式CPC的光线追迹模型,研究3种结构下CPC的光学性能。计算结果显示,接收器外加玻璃套管后产生临界折射角,部分光线经过玻璃套管折射后无法被接收器拦截,造成额外光学损失。随着玻璃套管外径增大,可被接收器拦截的光线数量减少,集热器光学效率降低。改变光线入射角会影响接收器周向能流密度分布。光线入射角为20°时,临界折射角对集热器光学性能影响最小,玻璃盖板式与真空管式CPC光学效率分别为68.5%、65.5%。
Abstract
To improve the solar energy utilization efficiency of compound parabolic concentrators（CPC）, optical models were established for three CPC structures： non-evacuated, glass-covered, and evacuated-tubular based on the principles of ray tracing. The optical performance of CPC under these three structures was systematically investigated. The results reveal that, after a glass sleeve was added outside the receiver, some rays with angles exceeding the critical refraction angle could not be intercepted by the receiver due to refraction by the glass sleeve, resulting in additional optical losses. As the outer diameter of the glass sleeve increases, the number of rays interceptable by the receiver gradually decreases, leading to a progressive decline in the optical efficiency of the CPC. The incident angle of ray affects the circumferential heat flux distribution of the receiver. As the incident angle of ray is 20°, the influence of the critical refraction angle on the optical performance of the CPC is minimized, with the optical efficiencies of the glass-covered and evacuated-tubular CPCs being 68.5% and 65.5%, respectively.
关键词
太阳能 /
光线追踪 /
能流密度 /
复合抛物面集热器 /
光学效率
Key words
solar energy /
ray tracing /
heat flux /
compound parabolic collector /
optical efficiency
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基金
国家自然科学基金（51966011）; 内蒙古科技重大专项（2021ZD0030）; 自治区直属高校基本科研业务费项目（JY20220309）
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