Skip to main content

Research Repository

Advanced Search

Analysis of the daylight performance of window integrated photovoltaics systems

Sun, Yanyi; Liu, Dingming; Flor, Jan-Frederik; Shank, Katie; Baig, Hasan; Wilson, Robin; Liu, Hao; Sundaram, Senthilarasu; Mallick, Tapas K; Wu, Yupeng


Yanyi Sun

Dingming Liu

Jan-Frederik Flor

Katie Shank

Hasan Baig

Robin Wilson

Hao Liu

Tapas K Mallick

Yupeng Wu


Integrating photovoltaics into windows provides the possibility of including an additional function of energy production to a conventional building fenestration component. There is no doubt that electrical power can be generated on-site. However, the effect of PV windows on the indoor luminous environment of the space served by them has not been comprehensively researched. This paper investigated the daylight performance of integrating four types of photovoltaics (semi-transparent thin film Cadmium telluride (CdTe) solar cells with 10% and 50% transparency, crystalline silicon solar cells with and without crossed compound parabolic concentrators (CCPC)) to a window of a typical south-facing office under different Window-to-Wall Ratios (WWRs). Annual useful daylight illuminance (UDI), daylight uniformity ratio (UR) and daylight glare probability (DGP) have been analysed based on dynamic simulation using RADIANCE. The simulation results show that windows integrated with crystalline silicon cells and CCPC optics have the potential to provide best daylight availability when compared with standard double glazed windows and other tested PV window prototypes, if it is applied to rooms with large WWRs (e.g. 60% or 75% WWR) at high latitudes (e.g. city of Harbin). Its application also improves the uniformity of daylight spatial distribution and eliminates the risk of glare. Semi-transparent CdTe PV window with 10% transparency can also improve the percentage of working hours that fall into UDI 500–2000lux range, however, it will result in the most sharp illuminance contrasts within the room. Applying all of these tested PV windows can effectively reduce the possibility of glare.

Journal Article Type Article
Acceptance Date May 14, 2019
Online Publication Date May 17, 2019
Publication Date 2020-01
Deposit Date Mar 13, 2023
Journal Renewable Energy
Print ISSN 0960-1481
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 145
Pages 153-163
Keywords PV windows, Daylight performance, RADIANCE, UDI, UR and DGP