The Ever Changing Sky -- BIM Model In Daylighting Study PDF

This paper presents a daylight simulation study to demonstrate the importance of "time"-based information in building performance analysis and discuss how it can be used with building information model. In the daylight simulations by Radiance, a chamber with single opening and adjustable blinds was specified and the sky conditions were field-sampled in 5-minute interval over 2-hour duration by HDRI photography technique. By analyzing the sky conditions, the optimal positions of blinds and corresponding indoor illuminance level at different time, it was found that hourly weather data are not detailed enough for daylight control study. Possible alternatives for sky condition representation are then proposed.