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Daylighting characteristics and experimental validation of a novel concentrating photovoltaic/daylighting system

Xuan, Qingdong; Li, Guiqiang; Lu, Yashun; Zhao, Bin; Zhao, Xudong; Pei, Gang


Qingdong Xuan

Guiqiang Li

Yashun Lu

Bin Zhao

Gang Pei


Daylight plays an important role on the environmental comfort level for buildings. As for the energy consumption in the building, lighting is one of the main contributors. However, traditional building integrated solar utilization systems such as flat photovoltaic or concentrating photovoltaic systems can only supply the heat or the electricity for buildings. Thus, a novel concentrating photovoltaic/daylighting window is proposed as a strategy to effectively generate the renewable electricity for the domestic use while providing a better daylight performance. The indoor experiment and ray tracing simulation are both conducted to identify the effect of the “daylighting window” on the optical performance of the concentrator. The annual daylight performance of a typical office building installed with the concentrating photovoltaic/daylighting window at various installation angles, window-to-ceiling ratios and under different climate conditions is investigated through RADIANCE. The accuracy and confidence of the simulation model is validated through the outdoor experiment, and the deviation between the experimental and simulation results is as low as 8.7%, which is indicated by the coefficient of variation of the root mean squared error. The simulation results show that the concentrating photovoltaic/daylighting window provides a good daylight performance on the working plane of the office room: the percentage of the working hours under daylight that lies in the useful range (100–2000 lx) can be up to 92.00%. It also achieves a homogenous distribution of daylight within the internal working space and effectively reduces the possibility of glare. Through the simulation results under different climate conditions, besides of the solar irradiance, the latitude also has an obvious effect on the annual daylight performance. So for the application in different latitudes, it’s highly recommended to be installed with the inclination angel near the local latitude for a higher annual electricity output and better annual daylight performance.


Xuan, Q., Li, G., Lu, Y., Zhao, B., Zhao, X., & Pei, G. (2019). Daylighting characteristics and experimental validation of a novel concentrating photovoltaic/daylighting system. Solar Energy, 186, 264-276.

Journal Article Type Article
Acceptance Date May 7, 2019
Online Publication Date May 14, 2019
Publication Date Jul 1, 2019
Deposit Date May 22, 2019
Publicly Available Date Oct 27, 2022
Journal Solar Energy
Print ISSN 0038-092X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 186
Pages 264-276
Keywords Renewable Energy, Sustainability and the Environment; General Materials Science
Public URL
Additional Information This article is maintained by: Elsevier; Article Title: Daylighting characteristics and experimental validation of a novel concentrating photovoltaic/daylighting system; Journal Title: Solar Energy; CrossRef DOI link to publisher maintained version:; Content Type: article; Copyright: © 2019 International Solar Energy Society. Published by Elsevier Ltd. All rights reserved.


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Copyright Statement
©2019, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license

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