ブラインドを通してみる眺望に対する在室者の満足度にブラインドと屋外の輝度比が与える影響

摘要

近年、オフィスビルでは自動制御ブラインドの使用が増加している。ブラインドの主たる機能は「直射日光の遮蔽」と「グレアの抑制」にある。現行の自動制御ブラインドは、直射日光が室内に入射しないように太陽位置によりスラット角を制御し、さらにグレアを考慮して任意な角度を加えている（図1、本論文ではこの角度をオフセット角と呼ぶ）。%The purpose of this study is to identify the effect of the ratio of blind slats luminance to outside luminance on occupants' satisfaction with outside view through blinds. In order to decide experiment condition, using the Expanded AMeDAS weather data, the frequency of the blind slat angle and the range of blind luminance are calculated. A subjective experiment using PC display is conducted. The subjects decide the slat angle so that they can be satisfied with a view. The result of analysis of variance shows that the slat angle, which gives the subjects satisfaction with outside view, depends on the blind luminance and the outside view luminance. In addition, based on the results of the subjective experiment, a computer simulation is conducted to predict annual frequency of the time when occupants are satisfied with a view through the blinds.