Abstract:
Bringing daylight into buildings is a way to reduce energy consumption as some indoor sport buildings have adopted this strategy but it has not been as efficient as expected.The main purposes of this study were to examine the factors that affect the illuminance and the uniformity of light in the sporting areas and to explore daylighting design guidelines for an indoor sport building.In this research, a model of an indoor sport building, with a width of 22 meters, length of 44 meters and height of 7 meters, was simulated by DIALux 4.11 program. Based on this model, daylight came through the skylight facing the north and the south. The illuminance and the uniformity of daylight were measured at the ground level of +0.00 meters. The measurement was set at every 2.5 meters along the north-south direction of the sporting areas. The measurement was carried out under clear sky condition on June 21, September 21 and December 21 at 08.00, 10.00, 12.00, 14.00 and 16.00 respectively. The factors taken into consideration were the spacing between the top lighting apertures, the height of the top lighting apertures and the shape of reflector.It was found that the factors that affected the illuminance level were the height of the top lighting apertures and the curve reflector. The illuminance level varies according to the height of the top lighting apertures while the illuminance level and the length of the curve vary inversely.The factors that affected the uniformity of daylight were the spacing between the top lighting apertures and the curve reflector. The uniformity of daylight varies according to those two factors