A Preliminary Study on Daylighting Performance Evaluation of Light Shelf based on the Inclined Ceiling during winter solstice

Abstract

Light shelf is considered a solution for the light energy issues, and thus various studies are being conducted with regard to light shelf; however, none of them consider spatial form. Therefore, this study aims to establish basic data for light shelf design by conducting a performance evaluation and producing the optimal plan for spaces with a unique form such as sloped ceiling on the winter solace. The conclusion is as follows: 1) light shelf with a negative (-) angle on the winter solace is inappropriate as the ceiling does not reflect the light in the inflow of natural light. 2) There are no changes in the depth that satisfies the standard intensity of illumination depending on non-installation and installation of light shelf on the winter solace. 3) The installation of light shelf on the winter solace has a low distribution of average illumination compared to non-installation, while the uniformity ratio of illumination is improved. 4) The optimum light shelf standard considering the uniformity ratio of illumination as well as energy saving with regard to the space of sloped ceiling on the winter solace is the width of 300mm and the angle of 10˚.