Solar trough receiver with V-grooved light traps for efficiency improvement  

作　　者：Bin LIU Qing LI Yu QIU 

机构地区：[1]School of Energy Science and Engineering,Central South University,Changsha 410083,China

出　　处：《Science China(Technological Sciences)》2025年第1期142-152,共11页中国科学(技术科学英文版)

基　　金：supported by the Natural Science Foundation of Hunan Province(Grant No.2024JJ4059);Changsha Outstanding Innovative Youth Training Program(Grant No.kq2306010);the National Natural Science Foundation of China(Grant No.52176093);the Central South University Innovation-Driven Research Programme(Grant No.2023CXQD055)。

摘　　要：Parabolic trough collector is a promising technology for both domestic and industrial heat supplies.To enhance the collector efficiency,a modified trough receiver with dozens of V-grooved light traps incorporated into its lower-half absorber was introduced.For assessing the performance of this receiver,a solar-thermal-stress coupled model was established.Using this model,firstly,the effects of the V-grooved light traps were investigated.The results reveal that,compared to the conventional trough receiver,the modified trough receivers equipped with different traps can reduce their optical losses by 81.9-138.0 Wm^(-1)(i.e.,15.0%-25.2%),improving their optical efficiencies by 1.60%-2.69%.However,these traps also result in increased thermal loss from the receiver.Therefore,there is no single optimal modified trough receiver that consistently outperforms all other receivers across all possible conditions.Nonetheless,the MTR30-3 and MTR60-3 receivers emerge as the optimized choices due to their better solar-thermal performance.Subsequently,performance evaluation reveals that the two optimized receivers can enhance the receiver efficiencies within the typical solar irradiance range by 0.02%-2.65%and 0.05%-1.70%when the inlet fluid temperatures are below 488 and 523 K,respectively.Consequently,the collector efficiencies can be improved by 0.02%-2.49%and 0.05%-1.60%,respectively.Additionally,thermal stress analysis verifies that the two optimized receivers remain within safe limits under all typical conditions.Given that the heating temperature of a typical solar collector for domestic or industrial heat supply is typically below 523 K,the integration of the two optimized receivers has the capability to effectively enhance the overall collector efficiency.

关 键 词：parabolic trough collector RECEIVER V-grooved light trap solar-thermal-stress coupled model efficiency improvement 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]