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Daylight Calculation Methods for Residential Spaces in Warm-Humid Climates: A Case Study From Chennai
Abstract
Daylighting is valued in commercial and industrial settings but disregarded in residences. Thus, the study uses a ground-floor of a residence in Chennai, a warm, humid climate zone, to learn daylight calculating methodologies and metrics. The study assesses daylight performance using a BRE protractor, an Illuminance meter, and Design Builder simulation. Daylight Factor is used to evaluate all procedures in overcast skies. Differences in daylight factor, window-wall ratio (WWR), uniformity ratios, and Illuminance values are examined by comparing these methodologies. Variations in kitchen window size are examined to determine the best WWR for Daylight without glare. For efficient daylighting, maintain 0.4 to 0.7 uniformity ratio and 20–30% WWR. The report also discusses DF's limits and supports Useful Daylight Illuminance (UDI) for greater performance utilising actual annual climate-based figures. Thus, this study improves daylight performance understanding for energy-efficient residences.
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