Proposal of a Method for Determining Slat-Rotation Speed of Automated Blinds to Reduce Discomfort Caused by the Change in Window Brightness

Abstract

The purpose of this study is to reduce discomfort caused by the change in the brightness of windows by changing the speed of the slat rotation. In order to identify the degree and the frequency of the change in luminance of the windows with blind controls, a numerical simulation was carried out by using weather data. An experiment was carried out in a test chamber to identify the effect of the change in the window brightness on the subjective response. The results of the experiment showed the effect of slat-rotation speed and the change in window luminance on "Discomfort caused by the change in the window brightness" rated by the subjects. In this study, the method for determining slat-rotation speed of blinds was proposed based on "Discomfort caused by the change in the window brightness" obtained from the subjective experiment.

Test rooms to study human comfort in buildings: A review of controlled experiments and facilities

“…11b). The majority of studies focused on glare (more than 50%), either to evaluate subjective perceptions due to variations of lighting conditions or other factors' influences (such as time of the day or openings and blinds features) [21,22,37,39,42,66,[171][172][173][174][175][176][177][178][179][180][181][182], develop, evaluate or validate metrics, thresholds or indexes [35,68,[183][184][185][186][187][188][189][190][191][192][193], investigate glare influence on performance and physiology [187,[194][195][196] or study a combination of such objectives (Fig. 11a).…”

“…The studies investigating a mix of daylight and electric light were provided with shading devices [189,190,205,220,223]. On the other hand, not all the studies on daylight were provided with a real window to the outdoor (intended as an opening with a view), but used artificial windows [37,177,181,192,204] or anidolic systems on the southern façade [224]. Non-visual factors were measured, controlled, or balanced across experimental conditions in almost all stand-alone test room experiments, and only in fewer re-configured offices [199,205,217,218,223,225].…”