A daylight factor model under clear sky conditions for building: An experimental validation. (May 2015)

• Record Type: Journal Article
• Authors: Sudan, Madhu; Tiwari, G.N.; Al-Helal, I.M.
• Is Part Of: Solar energy. Volume 115(2015)
• Page Start: 379
• Page End: 389
• Publication Date: 2015-05
• Subjects: Daylight factor -- Illuminance -- Sky component -- Internally reflected component; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2015.03.002
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: A daylight factor model has been developed and experimentally validated for side window (cuboid shaped room). The internal illuminance has been predicted for side window with the help of model. Daylight factors and its components have been evaluated. Abstract: In the present paper, daylight factor model (DFM) has been developed for daylight aperture which has been experimentally validated for east oriented wall window under clear sky condition. The correlation coefficient ( r ) and the root mean square percentage error ( e ) are in the range of 0.96–0.99 and 5.1–7.9%, respectively. It has been seen that there is a close agreement between modeled and measured values. The annual average daylight factor (DF), sky component (SC) and internally reflected component (IRC) values for the room were determined to be 1.8%, 1.2% and 0.6%, respectively. It is observed that the south oriented window has maximum DF while it is minimum for north oriented window. It is also concluded that the window in the upper position allows higher illuminance of the rooms compared to a wall window toward the bottom of the room.