Performance analysis of the aerogel-based PV/T collector: A numerical study

被引：21

作者：

Wu, Lijun ^{[1
]}

Zhao, Bin ^{[1
]}

Ao, Xianze ^{[1
]}

Yang, Honglun ^{[1
]}

Ren, Xiao ^{[1
]}

Yu, Qiongwan ^{[1
]}

Guo, Ke ^{[1
]}

Hu, Maobin ^{[1
]}

Pei, Gang ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Hefei 230027, Peoples R China

来源：

SOLAR ENERGY | 2021年 / 228卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Solar energy; Silica aerogel; Heat loss; Thermal radiation; PV; T; THERMAL-CONDUCTIVITY; EXERGY ANALYSIS; SILICA AEROGELS; SOLAR-SYSTEMS; ENERGY; ELECTRICITY; MODEL; WATER; INSULATION; NANOFLUIDS;

D O I：

10.1016/j.solener.2021.09.077

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Photovoltaic/thermal (PV/T) collector can convert incident sunlight into electrical and heat energy simultaneously. However, compared with the solar thermal collector, the radiative heat loss of the PV/T absorber is larger since the spectrally selective PV/T absorber is difficult to design and fabricate after introducing PV cells, which leads to lower thermal efficiency. Thus, an approach that can reduce the radiative heat loss of the PV/T collector without the requirement for spectrally selective PV/T absorber is emergently needed. Here, a novel aerogel-based PV/T collector is proposed to suppress radiative heat loss and improve efficiency by introducing the silica aerogel that is highly transparent to sunlight and opaque to infrared light, as well as ultra-low effective thermal conductive into the PV/T collector. A numerical model is established to evaluate the performance of the aerogel-based PV/T collector, and the results present that the heat loss of the PV/T collector at the operating temperature of 70 degrees C can be dramatically reduced by approximately 75% after using the silica aerogel and the thermal efficiency can also be increased by 46%. Moreover, a parametric study is conducted to investigate the influence of solar radiation, ambient temperature, and emissivity of the PV/T absorber on the performance of the aerogel-based PV/T collector. This study is devoted to exploring a new method to suppress the radiative heat loss of the PV/T collector and enhance its solar harvesting performance correspondingly, which gives a reference for the design of high-performance PV/T utilization.

引用

页码：339 / 348

页数：10