Combining photovoltaic double-glazing curtain wall cooling and supply air reheating of an air-conditioning system: Energy-saving potential investigation. (1st October 2022)

• Record Type: Journal Article
• Authors: Tang, Yayun; Ji, Jie; Wang, Chuyao; Xie, Hao; Ke, Wei
• Is Part Of: Energy conversion and management. Volume 269(2022)
• Publication Date: 2022-10-01
• Subjects: Solar energy -- PV curtain wall -- Air-conditioning system -- Cold-heat offset -- Building energy saving; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2022.116097
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: A photovoltaic curtain wall coupled with an air-conditioning system is designed. Curtain wall cooling and supply air reheating are achieved using heat recovery. System performance is evaluated, taking an office in hot-humid summer as a case. The system increases power output by 1.07% and achieves 27.51% energy savings. Properly increasing channel thickness and photovoltaic coverage optimizes design. Abstract: To address the problems of PV facade overheating and air-conditioning cold-heat offset, this study proposed a novel PV double-glazing ventilated curtain wall system (PV-DVF) that combined PV cooling and dew-point air reheating. A case study was conducted based on an office building with a south-facing PV-DVF in Hefei, compared to one with a conventional PV double-glazing insulated curtain wall system (PV-DIF). This study mainly includes mathematical modeling and validation, performance prediction, and parametric analysis. During a typical summer week, the results reveal that the PV-DVF system achieved (1) a 4.64 °C drop in PV temperature and a 3.4 W (1.07 %) increase in power output, with 7.10 % electrical efficiency; (2) a 2083.22 W reduction in cooling energy consumption; (3) a 4431.81 W reduction in reheat energy; and (4) total electricity savings of 27.92 kWh/day. In the summer, the total electricity savings reached 1566.33 kWh, with an energy-saving ratio of 27.51 %. Furthermore, parametric study results show that properly increasing channel thickness and PV coverage ratio achieves better energy-efficient performance.