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http://dx.doi.org/10.7836/kses.2014.34.6.039

Application of the Daylight Factor Formula with the Modified Split Flux  

Yun, Su-In (Department of Architecture, Korea University)
Yun, Gyeong (Department of Architecture, Korea University)
Kim, Kang-Soo (Department of Architecture, Korea University)
Publication Information
Journal of the Korean Solar Energy Society / v.34, no.6, 2014 , pp. 39-47 More about this Journal
Abstract
Daylighting has a great effect on people inside the room. It is also closely related to the lighting energy consumption. Daylight factor(DF) is a very important index for evaluation of the daylighting in overcast sky. The objective of this study is to verify the suitability of the Tregenza's Modified Split Flux formula for the calculation of the daylight factor. We compared the daylight factors calculated by two methods; one by a measurement with 1/5 scale model and the other by the Daysim program. We used variables for verification as window wall ratios(WWR) and angles of the sky visible. As a result, daylight factor calculated by Modified Split Flux is similar to the measurement when more daylight enters the inside. And error is significantly increased when the angle of the sky visible is $50^{\circ}$.
Keywords
Daylight Factor; Modified Split Flux; Scale model testing; Daysim; Overcast Sky;
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