New solar shading system based on daylight directing solar glass lamellas

SUMMARY This paper describes the development of a new solar shading system consisting of glass lamellas with a reflecting solar control coating. The coating is able to efficiently reduce the solar gain through building facades and at the same time redirect part of the daylight into the back of the room where it is most needed. The shading system has been simulated using IESve/Radiance on daylight conditions for a single cell office. A full-scale model of the shading system has also been tested in SBi’s Daylight Laboratory. Simulations and measurements on the shading system under overcast conditions show a reduction in the daylight factor (DF) close to the facade while the DF is unchanged or even higher in the back of the office. Under sunny sky conditions, the lamellas will normally be turned into a vertical position. In this position, the reflective coating will contribute to reduce the heat load on the office significantly.