An optimal and comparison study on daylight and overall energy performance of double-glazed photovoltaics windows in cold region of China. (1st March 2019)

• Record Type: Journal Article
• Authors: Cheng, Yuanda; Gao, Min; Jia, Jie; Sun, Yanyi; Fan, Yi; Yu, Min
• Is Part Of: Energy. Volume 170(2019)
• Page Start: 356
• Page End: 366
• Publication Date: 2019-03-01
• Subjects: DS-STPV -- PV cell coverage ratio -- Window-wall-ratio -- Orientations -- Daylighting quality -- Energy consumption; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2018.12.097
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: The semi-transparent photovoltaics (STPV) window is recognized by many as an innovative and emerging technology. However, the applications of building-integrated STPV windows are restricted to a certain extent by potential conflicts between the daylighting quality and energy efficiency. In this study, a novel metric named the ratio of N-Daylit area was derived to quantify the daylighting quality. On this basis, parametric analysis with different PV cell coverage ratios, window-wall-ratios (WWR) and orientations of double-skin STPV windows were performed to obtain annual daylighting quality and net electricity use for a generic reference office located in cold region of China. An optimal design of DS-STPV facing south with PV cell coverage ratio of 30% and WWR of 30%–40% was recommended according to the simulation results. Furthermore, a comparison study of DS-STPV against with other five types of commonly used was also conducted. The results revealed that the utilization of STPV was beneficial for the improvement of daylighting quality and led to a reduction of annual energy consumption of the office. By using the DS-STPV, the ratio of N-Daylit area was increased to 56.8% with an increment of 31%, while the net electricity use of the space was as low as 36.1 kW h m −2 ∙yr −1 . Highlights: The daylighting simulation model in Daysim was experimentally validated. A new metric named "N-Daylit area" was proposed to quantify the daylighting quality. The daylight and energy performance of STPV facades was investigated simultaneously. An optimal design of STPV facades was recommended according to simulation results. Benefits with the application of STPV facades have been further demonstrated.