Performance Enhancement of Parabolic Trough Collector by Using Homogenizer and Spiral  

作　　者：LI Peijing LIU Taixiu QIN Yuanlong ZHENG Zhimei ZHAO Kai LIU Qibin 

机构地区：[1]School of Energy,Power,and Mechanical Engineering,North China Electric Power University,Beijing,102206,China [2]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing,100190,China [3]University of Chinese Academy of Science,Beijing,100049,China [4]Department of Thermal Science and Energy Engineering,University of Science and Technology of China,Hefei,230027,China [5]Research Institute of Science and Technology of China Three Gorges Group Corporation,Beijing,100038,China

出　　处：《Journal of Thermal Science》2024年第2期658-674,共17页热科学学报（英文版）

基　　金：supported by the Distinguish Young Scholars of the National Natural Science Foundation of China (No.52225601);the Major Program of the National Natural Science Foundation of China (No.52090061)。

摘　　要：In conventional parabolic trough collectors(PTCs),sunlight is concentrated at the bottom of the absorber tube,resulting in a significant circumferential temperature gradient across the absorber tube,heat loss and thermal deformation,which affects the safety and thermal performance of PTCs.In this study,a new receiver with homogenizer and spiral(RHS) is proposed,achieving the optical and thermal synergy to ameliorate the thermal deformation of the absorber tube and enhance thermal efficiency.A plane structure homogenizer is designed to improve uniformity of the concentrated solar flux of absorber tube through second reflection.In combination with the spiral,it improves the optical-thermal efficiency of the PTC by enhancing heat exchange between the fluid and the backlight side of the absorber tube.The performance of the collector is numerically studied by building a three-dimensional coupled light-thermal-structure model.The results show that the thermal deformation of the RHS is reduced by more than 96% and the optical-thermal efficiency is improved by 1.2%-0.63% compared with conventional receivers(CRs) under the same inlet temperature conditions.The proposed receiver is validated to be effective in reducing thermal deformation and improving optical-thermal efficiency.

关 键 词：parabolic trough collector HOMOGENIZER thermal deformation SPIRAL 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]