Energy-Efficient Window Concept For Classroom in Warm Tropical Area

Binarti, Floriberta (2009) Energy-Efficient Window Concept For Classroom in Warm Tropical Area. In: Proceeding of the 11th International Conference on QiR (Quality in Research) Faculty of Engineering, 3-6 August 2009, University of Indonesia, Depok.

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Abstract

Shading device, window to wall ratio, window height, and glazing are important factors in determining building energy consumption in the tropics. This study employed the four factors in designing energy-efficient window for classroom to reduce the energy consumption for supplemented lighting and mechanical ventilation. The main parameter is classroom’s cooling load or heat transfer through the building skins (< 10 watt/m2) incorporated with secondary parameters, i.e. indoor illuminance level (200-400 lux) or daylight factor (2-3%), and horizontal illuminance distribution. Relationship among window to wall ratio, window to floor ratio, height of clerestory, clerestory to wall height ratio, and classroom’s orientation, width and length are examined using Ecotect simulation program to stablish a concept for energy-efficient classroom’s window. Window with projected clerestory is the most energy efficient. It transfers minimum solar radiation and creates the most even horizontal illuminance distribution with sufficient level. Small difference in energy performance but lower cost can be achieved by window with glass-block clerestory or with lightshelf. Three kinds of clerestory should be applied on classroom with considering the window to wall ratio (20%), the clerestory head height to room height ratio (11%), the head height clerestory to room width ratio (around 5%).

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