Question

 

Explain in detail the various methods for calculating daylight received in buildings?

06 Mar 2026
Answer :
Word Count : 486
Daylighting in buildings is a critical aspect of energy-efficient design, as it reduces the reliance on artificial lighting and improves occupant comfort. Calculating the daylight received in buildings involves assessing the amount of natural light that penetrates interior spaces through windows, skylights, and other openings. Various methods exist for this purpose, ranging from simple empirical approaches to sophisticated computational simulations. One commonly used method is the Daylight Factor (DF) approach, which provides a percentage measure of indoor illuminance relative to outdoor illuminance under overcast sky conditions. The Daylight Factor is composed of three main components: the sky component (SC), which represents direct light from the sky visible through the window; the externally reflected component (ERC), which accounts for light reflected from external surfaces such as adjacent buildings or the ground; and the internally reflected component (IRC), which considers light reflected from interior surfaces such as walls, floors, and ceilings. These components can be calculated using geometric and reflectance data of the building and its surroundings. Another method is the Sunlight Autonomy (SA) and Useful Daylight Illuminance (UDI) approaches, which are increasingly used in modern energy-efficient buildings. Sunlight Autonomy measures the
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