基于临界截取消除多次反射的非成像聚光器设计与性能分析  

Design of Non-Imaging Condenser Based on Critical Interception to Eliminate Multiple Reflections and Performance Analysis

作　　者：戴鑫 肖李业 陈飞[1,2] Dai Xin;Xiao Liye;Chen Fei(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China;Institute of Solar Energy Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650500 [2]昆明理工大学太阳能工程研究所,云南昆明650500

出　　处：《光学学报》2024年第14期234-242,共9页Acta Optica Sinica

基　　金：云南省科技计划基础研究专项(202401AT070363);国家自然科学基金资助项目(51866005);云南省“万人计划”青年拔尖人才专项(YNWR-QNBJ-2019-173)。

摘　　要：针对标准复合抛物面聚光器(S-CPC)存在的反射面末端聚光能力有限、能流密度分布不均匀以及太阳辐射收集较少等问题,基于临界截取方法构建高位临界截取CPC(H-CPC)和低位临界截取CPC(L-CPC)优化模型。同时采用户外小孔光学实验验证临界截取CPC模型的可靠性,并通过理论模拟分析其光学性能。研究结果显示:H-CPC和L-CPC的平均光学效率分别为38.4%和46.3%,均高于S-CPC。此外,基于临界截取设计的CPC具有更大的光线接收角范围,即使光线入射角大于30°仍可接收太阳光线,从而有效延长了聚光器工作时间,同时其吸收体表面的能流密度分布也更加均匀。同步使用VC/C++程序求解年采光量,表明H-CPC和L-CPC理论年辐射收集量分别比S-CPC高出887.24 MJ/m^(2)和1429.89 MJ/m^(2)。临界截取CPC具有更高的能耗比,经济效益显著,对太阳辐射的收集能力更强,具有更好的工程应用潜力。Objective Solar energy is highly valued as a renewable energy source due to its clean,sustainable,and inexhaustible nature.Solar concentrating technology has attracted significant attention because of the wide distribution of solar radiation and relatively low energy flux density.Currently,this technology finds extensive applications in various fields such as photothermal conversion,photoelectric conversion,and photochemical conversion.Based on the principle of non-imaging optics,the compound parabolic concentrator(CPC) offers numerous advantages including the absence of mechanical tracking devices,simultaneous collection of direct and diffuse radiation,and flexible operational timeframes.Consequently,it has gained wide acceptance in engineering applications.To address the problems of standard compound parabolic concentrator(S-CPC),such as limited concentrating ability at the end of the reflector,uneven energy flow density distribution,and reduced solar radiation collection,we construct a high-critical interception CPC(H-CPC) and a low-critical interception CPC(L-CPC) optimization model based on the principle of critical interception.Methods By intercepting the S-CPC at appropriate positions,it is possible to enhance optical efficiency effectively.However,truncation at excessively low positions may compromise the uniformity of surface energy flux density on the absorber.We address issues such as inadequate concentration effect on the condenser's end surface,multiple incident light reflections,and uneven energy flux density distribution on the absorber's surface by employing different interception positions on the S-CPC for improved optical performance.In addition,we conduct a comparative analysis between truncated CPCs and the S-CPC in terms of optical efficiency,energy flux density,and radiation collection amount.To verify the reliability of the truncated CPC model we constructed,a high-precision three-dimensional(3D) printer is used to print the truncated CPC model,and the pinhole imaging experiment is carried

关 键 词：光学设计 太阳能 复合抛物聚光器 临界截取 光学性能 

分 类 号：O435.1[机械工程—光学工程]