Components of Daylight Factor
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Components of Daylight Factor
Daylight factor is the sum of all the daylight reaching on an indoor reference point from the following sources:
1.Direct sky visible from the point, expressed as the sky component (SC),
2.External surfaces reflecting light directly to the point , expressed as the externally reflected component (ERC),
3.Internal surfaces reflecting and inter-reflecting light to the point, expressed as the internally reflected component (IRC).
DF = SC+ ERC+IRC
[Image: image-27.png]
Design variable for SC
  • Area of sky  visible from  point
  • Average altitude angle
  • Window size
  • Window position in relation to point
  • Thickness of window frame member
  • Quality of glass
  • External obstruction 
Design variable for ERC
  • The Area of external surface visible from the point
  • Reflectance of external surface
Design variable for IRC
  • Size of Room
  • The ratio of wall etc.
  • Surface in relation to window area
  • Reflectance of indoor surfaces

To know more about illumination read .... Components of Daylight Factor
Illumination in architecture
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