초록 close

Daylight illuminance levels in a small office space with a double skin envelope system were analyzed utilizing computer simulations under a series of daylight conditions. Daylight conditions used were clear window without blinds, horizontal blinds, and positioned at two ways of 45o on a external envelope under a clear sky. Hourly data from 8:00 a.m to 5:00 p.m during seven months for each daylight conditions were provided. As sun altitudes changed, the average illuminance levels on a desktop due to daylight were significantly impacted by blind angle settings. Daylight factors decreased as time changed from December to June. The predictions for applying a phtoelectric dimming control system provided that the minimum electric light output was used during entire time periods under a clear sky without undershooting the target illuminance on a desktop. The correlations between sun altitudes and desktop illuminance levels were performed using a linear regression method for the purpose of predicting how the blind conditions influence desktop illuminance levels under a variety of day and time in a year.