| Keywords |
Visual environment ; Daylight ; Optimum dimming control ; Electric circuit ; Fixtures |
| Abstract |
This study examines the effect of a daylight dimming control system to improve visual environment in a classroom. Computer simulations were conducted for a variety of daylight conditions. Results indicate that correlation between desktop illuminance by daylight and photosensors signals by daylight were stronger in rear area of space compared to that in areas close to window. This implies that the photosensors installed in rear area might contribute to dimming control performance only in a case that daylight was considered. Overall, the photosensor in rear area failed to keep target illuminance due to strong impact of electric light output. An electric circuit connected to all lighting fixtures in space should be divided to keep target illuminance for rear area, when a daylight dimming control system is applied. The probability for an optimum control performance decreased as the distance from window to desktops increased beyond 5 m. For the area where electric light was stronger than daylight, photosensors should not be exposed to electric light directly so that photosensor signals remain within desirable ranges for optimum control. In addition, more shielding condition should be applied to photosensors installed in the rear area of space. |