| Title |
Control Performance of a Photosensor Dimming Control System for a Direct/Indirect Lighting System in a Small Office with a Double Skin Envelope |
| Keywords |
Photoelectric Dimming Control System ; Double Skin Envelope ; Photosensor Shielding Conditions ; Lighting Energy Savings |
| Abstract |
The control performance of a photoelectric dimming system for a small office with a double skin envelope system was evaluated under various daylight conditions in order to provide control guidelines for the system. Computer simulations were performed for three different photosensor shielding types applied to direct/indirect lighting fixtures under clear, intermediate and overcast sky conditions. The conditions were applied in the north and south facing office space. Fully-shieded photosensors generally provided good control performance blocking the direct light from fixtures. Unshielded photosensor conditions failed to secure necessary illuminance on the desktop. Clear sky and south-facing conditions provided good control performance with reasonable electric lighting energy savings. The correlations between desktop and photosensor illuminance were analyzed using a linear regression method. The coefficients of determination ranged from 0.74 to 0.98 and the strong correlation happened to the partially-shielded conditions. |