Comprehensive analysis of heat transfer of double-skin facades integrated high concentration photovoltaic (CPV-DSF)

• Published in: Renewable energy 2020-12, Vol.161, p.635-649
• Main Authors: Zhu, Li, Zhang, Jiqiang, Li, Qingxiang, Shao, Zebiao, Chen, Mengdong, Yang, Yang, Sun, Yong
• Format: Article
• Language: English
• Subjects: Concentration photovoltaic; Double-skin facades; Heat transfer; Numerical model
• ISSN: 0960-1481; 1879-0682
• DOI: 10.1016/j.renene.2020.07.045

In this paper, the comprehensive heat transfer performance of double-skin facades integrated high concentration photovoltaic (CPV-DSF) is analyzed. Energy balance equation and thermal resistance model of CPV-DSF are established, and the calculation method of the comprehensive heat transfer coefficient of CPV-DSF is obtained. Solar radiation distribution of the outer single glass, inner double glass and the concentrating array in the CPV-DSF are studied using TracePro software. The optimization analysis of channel and vent width of CPV-DSF is carried out using Fluent software. The simulation results show that when the channel width is between 0.5 and 1.0 m, the changes of cell temperature, exhaust volume and comprehensive heat transfer coefficient are small, and the exhaust heat first decreases and then increases with the increase of the channel width; When the width of vent increases from 0.1 m to 0.25 m, the concentrating cell temperature and comprehensive heat transfer coefficient change little, and the exhaust volume and exhaust heat increase with the increase of the vent width. The recommended value of channel width and ventilation outlet width of the CPV-DSF is 0.5 m and 0.2 m respectively, and the corresponding solar radiation transmittance of CPV-DSF is the highest, the internal air flow is optimized highest, and the exhaust heat is most. Under the optimal conditions, the comprehensive heat transfer coefficient of CPV-DSF is 1.179 W/(m2·K), the exhaust heat is 143.70 W, and the average temperature of concentrating cell is 59.81 °C, which is 15.07 °C lower than that without ventilation. The performance of proposed CPV-DSF is better than that of the traditional DSF. •A numerical model is established to investigate the heat transfer in CPV-DSF.•Distribution and transmittance of solar radiation in CPV-DSF are studied.•The airflow and heat transfer characteristics in CPV-DSF are summarized.•The effects of channel and vent width on airflow and heat transfer characteristics are evaluated.•Optimal CPV-DSF parameters are proposed for Tianjin, China.