Key Words Blind system E Daylighting, Shading device E

Themain purpose of using a shading device is usually to prevent excessive sunlight from delivering into the building and to distribute daylight entering a building more evenly in space. However, in the design of a vertical fenestration system, there are a variety of considerations related to the building type and day-lighting potentials such as: latitude, climatic character-istics, the position of the sun and outdoor obstructions. To enhance the performance of sun lighting control, a shading device should play a more efficient role according to the building shape and orientation. This paper examines the method designed to improve both the indoor natural illuminance and open view for a better visual environment. The main aim of the pro-posed approach is to provide a simplified calculation for the several conditions of shading device shapes based on the computer simulation analysis. The proposed method was conducted by dividing the internal illumi-nance into four types of the shading device systems due to the direct sun radiations. This was calculated by a Desktop Radiance program. The room dimensions were based on a unit module of apartments of 6 m (width)6.9m (depth)2.7m (height) with a window measuring 4.5m2.43m. The variables considered were: a basic horizontal louver, a blind system and a proposed experimental shading device