| Title |
Development of a Movable Drawer Type Light-Shelf with Adjustable Depth of the Reflector |
| Authors |
Dasom Kim ; Haengwoo Lee ; Janghoo Seo ; Yongseong Kim |
| DOI |
http://dx.doi.org/10.6110/KJACR.2016.28.9.343 |
| Keywords |
광선반 ; 서랍형 ; 폭 ; 성능평가 Light-shelf ; Drawer type ; Width ; Performance evaluation |
| Abstract |
Due to the recent increase in lighting energy consumption in buildings, there are a growing number of studies seeking solutions this problem. The effectiveness of light-shelves as natural lighting systems to solve this problem has been recognized, and various studies regarding such systems are being carried out currently. However, the lighting efficiency of light-shelves decreases if illumination intensity is low-such as at night time, and it also obstructs the views of building occupants. Therefore, the purpose of this study is to examine a movable drawer type light-shelf which allows for the width of the reflector to be adjusted and verify its performance through a simulated test-bed. The following conclusions were reached. 1) The purpose of this study is to solve the problem previously associated with the light-shelf system- of obstructed views-by responding to external environments and minimizing the width of the light-shelf at night time when the efficiency of the light-shelf declines. 2) The proper variables of the movable drawer type light-shelf which enables the width adjustment of the reflector were ascertained in this study according to four solar terms : a width of 0.6 m at an angle of 20°, a width of 0.4m with an angle of 20°, and a width of 0.1 m with an angle of 20° were determined for the summer solstice, fall/spring equinoxes, and winter solstice respectively; revealing that width adjustment of the light-shelf is a significant factor. 3) The movable drawer type light-shelf which enables\width adjustment of the reflector suggested in this study can reduce the lighting energy consumption by 18.7% and 14.3% in comparison to previous light-shelves with a fixed width of 0.3 m and 0.6m, indicating that it is effective for saving energy. |