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Effect of Overhang Geometry on Work Plane Illuminance and Solar Heat Gain Pattern for Office Building Energy Saving in Tropical Climate

Dilshan Remaz Ossen1 and Mohd. Hamdan Ahmad2
1 Lecture, Faculty of Built Environment, Universiti Teknologi Malaysia, Johor DT, Malaysia
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2 Associate Professor, Faculty of Built Environment, Universiti Teknologi Malaysia, Johor DT, Malaysia
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ABSTRACT


In hot humid climate, one draw back of using shading devices is the risk of reducing work plane illuminance level which in turn increases the use of artificial lighting. It is important to understand the amount of natural light penetration when shading devices are adapted in order to propose optimum external horizontal shading strategies as design solutions. This study investigates the effect of six different alternatives of external horizontal shading device on transmitted solar heat gain pattern and natural-light penetration. The study was carried out using a standard, single fenestration perimeter office room in a typical high-rise office building. The investigation is conducted using eQUEST-3, which is a dynamic energy simulation program supported by the DOE2.2 calculation engine. The results showed several optimum geometries of the external horizontal shading device depending on transmitted solar heat gains and natural-light penetration. This study concludes, considering the trade off between total heat gain and natural-light penetration to determine the best option in designing external solar shading in hot humid climates.