THE REFLECTED LIGHT PERFORMANCE OF RAWSHANS

The Rawshan has been one of the traditional architectural devices that are still being used in contemporary buildings as an environmental control device, in order to control natural ventilation and light. The most critical portion of the Rawshan, as a light control component, is the front screen. A systematic analysis of this portion has not yet been taken care of. However, some pervious work on this component for the effect of direct sunlight transmission was investigated by the author. The aim 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.