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词汇 Daylight factor
分类 英语词汇 英语翻译词典
释义

Daylight factor

英语百科

Daylight factor

A study of daylight factors within a single storey building resulting from different perimeter glazing and rooflight designs and glass types. Undertaken using the IES Radiance software Module.

In architecture, a daylight factor is the ratio of the light level inside a structure to the light level outside the structure. It is defined as:

DF = (Ei / Eo) x 100%

where, Ei = illuminance due to daylight at a point on the indoors working plane, Eo = simultaneous outdoor illuminance on a horizontal plane from an unobstructed hemisphere of overcast sky.

To calculate Ei, requires knowing the amount of outside light received inside of a building. Light can reach a room via through a glazed window, rooflight, or other aperture via three paths:

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