A design method for optimizing the secondary reflector of a parabolic trough solar concentrator to achieve uniform heat flux distribution

被引：38

作者：

Tang, X. Y. ^{[1
]}

Yang, W. W. ^{[1
]}

Yang, Y. ^{[1
]}

Jiao, Y. H. ^{[1
]}

Zhang, T. ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Key Lab Thermofluid Sci & Engn MOE, Xian, Peoples R China

来源：

ENERGY | 2021年 / 229卷

基金：

中国国家自然科学基金;

关键词：

Parabolic trough concentrator; Flux compensation strategy; Secondary reflector; Heat flux distribution uniformity; Broken-line mirror; ABSORBER TUBE; PERFORMANCE ANALYSIS; COLLECTOR; RECEIVER; ENHANCEMENT; SIMULATION; POWER; TEMPERATURE; INSERT; OPTICS;

D O I：

10.1016/j.energy.2021.120749

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Non-uniform solar flux distribution in a parabolic trough concentrator (PTC) causes large temperature gradients on absorber tube surface, making the PTC inefficient and damaged. To solve the problem, a novel method is proposed for designing the additional secondary reflector (SR) in a PTC to improve uniform heat flux distribution on absorber tube surface. In the design, the heat flux between upper and lower surfaces of absorber tube is well balanced by optimizing the location of absorber. Then, the SR with segmented broken-line type composed of multiple plane mirrors is delicately designed with local heat flux compensation strategy. Two case studies are conducted to compare the performances of the newly designed SRs with other existing SR designs. It is shown that the uniformity of heat flux distribution can be improved to over 90% for present SR design, much higher than those for other existing SR designs. Also, the optical efficiency of the PTC with present SR design is also increased as compared with other designs. The results indicate that this proposed method is competent for designing SR in a PTC with uniform heat flux distribution. (c) 2021 Elsevier Ltd. All rights reserved.

引用

页数：15

共 42 条

[1] Historical development of concentrating solar power technologies to generate clean electricity efficiently - A review [J].

Baharoon, Dhyia Aidroos ;

Rahman, Hasimah Abdul ;

Omar, Wan Zaidi Wan ;

Fadhl, Saeed Obaid .

RENEWABLE & SUSTAINABLE ENERGY REVIEWS, 2015, 41 :996-1027

[2] Alternative designs of parabolic trough solar collectors [J].

Bellos, Evangelos ;

Tzivanidis, Christos .

PROGRESS IN ENERGY AND COMBUSTION SCIENCE, 2019, 71 :81-117

[3] Investigation of a star flow insert in a parabolic trough solar collector [J].

Bellos, Evangelos ;

Tzivanidis, Christos .

APPLIED ENERGY, 2018, 224 :86-102

[4] Thermal performance analysis of small-sized solar parabolic trough collector using secondary reflectors [J].

Bharti, Alka ;

Mishra, Abhishek ;

Paul, Bireswar .

INTERNATIONAL JOURNAL OF SUSTAINABLE ENERGY, 2019, 38 (10) :1002-1022

[5] New optical designs for large parabolic troughs [J].

Canavarro, D. ;

Chaves, J. ;

Collares-Pereira, M. .

PROCEEDINGS OF THE SOLARPACES 2013 INTERNATIONAL CONFERENCE, 2014, 49 :1279-1287

[6] A solar concentrator with two reflection mirrors designed by using a ray tracing method [J].

Chen, Chi-Feng ;

Lin, Chih-Hao ;

Jan, Huang-Tzung .

OPTIK, 2010, 121 (11) :1042-1051

[7] Numerical study of heat transfer enhancement by unilateral longitudinal vortex generators inside parabolic trough solar receivers [J].

Cheng, Z. D. ;

He, Y. L. ;

Cui, F. Q. .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2012, 55 (21-22) :5631-5641

[8] A comprehensive study on parabolic trough solar receiver-reactors of methanol-steam reforming reaction for hydrogen production [J].

Cheng, Ze-Dong ;

Men, Jing-Jing ;

Zhao, Xue-Ru ;

He, Ya-Ling ;

Tao, Yu-Bing .

ENERGY CONVERSION AND MANAGEMENT, 2019, 186 :278-292

[9] HIGH-CONCENTRATION 2-STAGE OPTICS FOR PARABOLIC THROUGH SOLAR COLLECTORS WITH TUBULAR ABSORBER AND LARGE RIM ANGLE [J].

COLLARESPERFIRA, M ;

GORDON, JM ;

RABL, A ;

WINSTON, R .

SOLAR ENERGY, 1991, 47 (06) :457-466

[10]

Dudley V., 1994, SANDIA941884 SAND NA

← 1 2 3 4 5 →