The skylight geometry and its glazing affect thermal comfort, occupant visual filed and energy consumption of the building. Multilateral glass shading systems are designed to protect against direct sun and transmit and reflect the sky component to the space below; however, the performance of these unique systems are not widely tested. To contribute to the design decision process, this paper aims to examine their performance and specifically, their impact on the spaces due to the incoming solar and visible energy. The main variable is the tilted angle of glass blades, which generates complex solar incident angles and multireflection, multi-transmission through various layers of glass. To solve this complex problem, solar geometry calculations and computer simulation have been utilized. The results show that the horizontal glass blade (low tilted angle) is the most effective choice. The heat is easily reflected out to the environment or filtered by the layers of glass blades; thus, the cooling load and energy are minimized.
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