Improving the performance of a 2-stage large aperture parabolic trough solar concentrator using a secondary reflector designed by adaptive method

被引：49
作者：
Gong, Jing-hu [1 ,2 ]
Wang, Jun [1 ,2 ]
Lund, Peter D. [1 ,3 ]
Hu, En-yi [1 ,2 ]
Xu, Zhi-cheng [1 ,2 ]
Liu, Guang-peng [1 ,2 ]
Li, Guo-shuai [1 ,2 ]
机构：
[1] Southeast Univ, Key Lab Solar Energy Sci & Technol Jiangsu Prov, 2 Si Pai Lou, Nanjing 210096, Peoples R China
[2] Southeast Univ, Energy Storage Res Ctr, 2 Si Pai Lou, Nanjing 210096, Peoples R China
[3] Aalto Univ, Sch Sci, POB 15100, FI-00076 Espoo, Finland
来源：
RENEWABLE ENERGY | 2020年 / 152卷
基金：
美国国家科学基金会;
关键词：
Parabolic trough concentrator; Secondary reflector; Adaptive method; Optical efficiency; Thermal efficiency; THERMODYNAMIC PERFORMANCE; THERMAL EFFICIENCY; MOLTEN-SALT; COLLECTOR; OPTICS; MCRT; FVM;
D O I：
10.1016/j.renene.2020.01.019
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this study, the efficiency of a large aperture 2-stage parabolic trough concentrator (PTC) is improved using an innovative design method for the secondary reflector (SR). The design method is based on an adaptive approach in which the SR is step-wise optimized to maximally reflect back to the absorber tube (AT) the part of solar radiation reflected by the primary reflector (PR) but not captured by the AT. The adaptive design method results in a SR design which consists of several parabolas with different focal lengths, each having a focus which lies in the focus of the PR. This ensures that the originally unabsorbed solar radiation will now hit the surface of AT. The optical efficiency of the PTC could be increased by 5.2% and thermal efficiency by 4.9%, respectively, compared to a case without optimized SR. In addition, the uniformity of the solar radiation flux on the ATs outer wall could be doubled, its temperature was more even. The new adaptive design approach of the SR could help to better optimize PTC systems. (C) 2020 Elsevier Ltd. All rights reserved.
引用
收藏
页码：23 / 33
页数：11
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