2018 Volume 138 Issue 8 Pages 416-421
Illumination covers almost 20%-30% of total electric consumption in office buildings. Using daylight may be a good choice to reduce lighting power consumption. However, the sunlight is dazzling when it enters the room directly and thus cannot be used as a direct light source. Therefore, it is necessary to develop a window system that combines seasonal strong light shielding and daylight utilization as well. In this paper the angle change type blind reflection plate is proposed where the entering sunlight will be reflected to the ceiling and act as a light source for the interior illumination. We have made a simulator for interior illumination system which can be used in any season in a year and it is also applicable in any size of the room. The simulator can use the daylight and has showed a very accurate illumination distribution results which supports the idea that using daylight in interior illumination is good for reducing the electricity consumption in offices.
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The Journal of the Institute of Electrical Engineers of Japan