| Title |
The Influence of Photosensor Configurations on Control Performance of Daylight Dimming Systems in a Small Private Office |
| Authors |
김수영(Sooyoung Kim) ; 이지현(Ji-Hyun Lee) |
| Keywords |
조광제어 ; 주광 ; 천공조건 ; 포토센서 ; 조명기기 Daylight dimming system ; Daylight ; Sky conditions ; Photosensor ; Lighting fixture |
| Abstract |
This study examines influences of a daylight dimming control system on the variation of indoor illuminance and lighting energy savings in a small office space. Field measurements and a series of computation were performed for typical types of sky conditions in summer. Results indicate that the daylight illuminance under clear and partly-cloudy sky were close to the target illuminance during a majority of time due to a higher ratio of window to wall. However, the target illuminance was not kept successfully due to the variation of photosensor signals which were strongly influenced by desktop illuminance. The system with partially-shielded conditions succeeded to keep target illuminance under clear sky conditions. The system failed under overcast sky conditions since the electric light output from fixtures caused excessive signals to photosensors due to insufficient daylight on a desktop. Unshielded and fully-shielded conditions were not recommended for effective controls of the systems. The influence of lighting fixtures on photosensors should be minimized to achieve successful lighting controls by daylight dimming systems. |