Solar transmission through windows with venetian blinds

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Pages151166; # of pages: 16
SubjectLighting; solar radiation; venetian blinds; luminance; lighting calculations; Heat performance
AbstractIn this paper, the author describes a method for calculating the luminance of a Venetian blind. The method takes into account the variation in luminance with slat width, as well as the reflection which occurs at the glass surface. It is assumed that the slats of the blind are flat and that they reflect incident light diffusely. The distribution of illumination is used in calculating the luminance functions of a Venetian blind illuminated by direct solar radiation, diffuse radiation reflected by the ground and diffuse radiation from the sky. The luminance functions are then integrated to obtain the illumination transmission factor. This factor is equal to the ratio of the illumination coefficient at a point on a surface within the room to the illumination coefficient at a point on the exterior face of the window. The luminance is also used in determining the light absorption factor of Venetian blinds. The author presents the data obtained for a standard light-coloured Venetian blind, with slats at a 45 degrees angle, placed behind a sheet of ordinary window glass. The transmission and reflection factors of the glass are expressed in a five- term polynomial, where the cosine of the angle of incidence is the main variable. The experimental results are not given.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number9511
NPARC number20358586
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Record identifier4352ab56-0f83-41a2-85bf-d08de0169f48
Record created2012-07-20
Record modified2016-05-09
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