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http://dx.doi.org/10.7836/kses.2011.31.4.136

Evaluation of Daylighting Performance and Design of a Curved-Lightshelf by the Ray Tracing Method  

Kim, Dong-Su (Dept. of Architectural Eng, Graduate School Hanbat National University)
Yoon, Jong-Ho (Dept. of Architectural Eng, Hanbat National University)
Shin, Woo-Chul (Dept. of Architectural Eng, Daejeon University)
Lee, Kwang-Ho (Dept. of Architectural Eng, Hanbat National University)
Publication Information
Journal of the Korean Solar Energy Society / v.31, no.4, 2011 , pp. 136-141 More about this Journal
Abstract
The lightshelf system reduces intense illumination levels of indoor from direct sun light and reflect to lead diffused light into indoor deeply. This study aims to design acurved-lightshelf by a ray tracing method and evaluate the daylighting performance of window integrated with the curved-lightshelf by computer simulations. For this purpose, evaluation test model was designed for the experiments to validate the simulation model, and the curved-lightshelf was designed by the ray tracing method using Ecotect. After the office model was designed using 3D simulation, the average indoor illuminance, luminance and distribution of illuminance were evaluated by simulation which has a algorithm of Radiosity and Ray-Tracing method under four different cases(case1;no lightshelf, case2; Flat board, case3; tilted at $30^{\circ}$ angle, case4; the curved-lightshelf). As results, it turns out that case1 showed higher average illuminance and case4 was more uniformly distributed than case2 and case3, In addition average luminance of case1 was also lower. indicating that the curved-lightshelf would reduce the possibility of the glare, while maintaining the sufficient daylight level.
Keywords
Daylight; Curved-Lightshelf; Simulation; Indoor Illunimace; Luminance; Perez sky; Uniform ratio of Illuminance;
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