| Title |
Impact of Blind Conditions on Daylight Illuminance and Lighting Energy Savings in a Small Office Space with a Double Skin Envelope |
| Keywords |
Double Skin Envelope System ; Daylight Illuminance ; Blind Condition ; Photoelectric Dimming Control System |
| Abstract |
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 45degrees 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. 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.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. |