Scattered sunlight determining sky luminance patterns

Richard Kittler and Stanislav Darula

Renewable and Sustainable Energy Reviews, 2016, vol. 62, issue C, 575-584

Abstract: During the first daylight photometry studies in the 18th Century three fundamental source types of daylight were characterised as direct sunlight, clear sky luminance distribution and overcast sky luminance uniformity. For minimum illumination and simplicity the last became the basic state to determine computational methods and practical graphical tools to evaluate daylight distribution especially in poorly naturally lit interiors. The simultaneously present sunlight and skylight under cloudless or cloudy conditions attracted the research of sky luminance distributions caused by the scattering of sunbeams within the atmosphere. The arbitrary real sky luminance patterns influenced by air molecule and aerosol turbidity as well as cloudiness were studied and measured to determine the relatively complex their changes. The historical search after the interrelated definition and mathematical expression of gradation and scattering indicatrix functions is explained in the gradually evolving progress in this paper.

Keywords: Sky luminance/radiance patterns; Sunlight scattering indicatrix; Sky luminance gradation; Standard homogeneous sky luminance distribution (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (4)

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DOI: 10.1016/j.rser.2016.05.012

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