新型槽式太阳能真空吸热管设计方法及其光学性能研究  

Design method and optical performance research of a new vacuum absorber tube of parabolic trough collector

作　　者：余强 单文玺 李自豪 雷东强[2] Yu Qiang;Shan Wenxi;Li Zihao;Lei Dongqiang(College of Information and Electrical Engineering,China Agricultural University,Beijing 100083,China;Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国农业大学信息与电气工程学院,北京100083 [2]中国科学院电工研究所,北京100190

出　　处：《可再生能源》2024年第1期30-37,共8页Renewable Energy Resources

基　　金：北京市自然科学基金面上项目(3222033);国家自然科学基金面上项目(52376219)。

摘　　要：针对传统槽式太阳能集热系统工质运行温度受限,以及真空吸热管表面能流密度分布不均而引起的热应力过大等问题,文章在不改变聚光器结构的条件下,提出了一种新型的槽式太阳能真空吸热管的设计方法,通过减小金属内管直径、下移金属内管位置以及在金属内管上方加装双曲线型二次聚光器来提高太阳能聚光比,改善了金属吸热管表面能流密度分布。利用仿真计算方法研究了新型槽式太阳能真空吸热管的光学性能,结果表明:和传统槽式太阳能真空吸热管相比,该新型结构在仅损失1.88%光学效率的情况下将聚光比从62 kW/m^(2)提升至71 kW/m^(2);能流密度分布均匀度改善了55.05%,提升了聚光-吸热系统的整体性能。This study addresses challenges associated with conventional parabolic trough solar power systems,including limited operating temperature and excessive thermal stress caused by uneven energy flux density distribution on the vacuum absorber tube's surface.Rather than altering the parabolic trough collector's structure,we introduce an innovative vacuum absorber tube design.This design involves reducing the diameter of the inner metal tube,shifting it downward,and adding a hyperbolic secondary concentrator above it to enhance solar energy concentration and improve energy flux distribution on the inner metal tube's surface.Simulation results for the new vacuum absorber tube yield promising outcomes.Optically,this novel design increases the concentration ratio from 62 to 71 and improves the uniformity of energy flux distribution by 55.05%.Importantly,these improvements come at the cost of only a 1.88%reduction in optical efficiency compared to traditional vacuum absorber tubes.Consequently,these modifications offer a substantial boost to the overall performance of the parabolic trough collector.

关 键 词：槽式太阳能集热器 真空吸热管 聚光比 能流密度分布 光学效率 

分 类 号：TK519[动力工程及工程热物理—热能工程]