The potentiality of reflected sunlight through Rawshan screens

Rawshans has been one of the traditional architectural devices that are still being used in recent buildings as an environmental controlling device. Beside their use as an architectural component, they have been used to control natural ventilation and light. The most critical portion of the Rawshan, as light control concern, is the front screen. A systematic analysis of this portion has not yet been taken care of. However, pervious work of this component was investigated by the author for the effect of direct sunlight transmission. The attention of this paper is to check the effect of the reflected lighting component for the screen cells. The typologies of the screen cells were reviewed; and selected types of screen geometry were tested using laboratory experimentations.