A Clear Sky Model of Diffuse Sky Radiance

[+] Author and Article Information
F. C. Hooper

University of Toronto, Toronto, Canada M5S 1A4

A. P. Brunger

Mechanical Engineering, University of Toronto, Toronto, Canada M5S 1A4

C. S. Chan

TransCanada PipeLines Ltd., Toronto, Canada

J. Sol. Energy Eng 109(1), 9-14 (Feb 01, 1987) (6 pages) doi:10.1115/1.3268184 History: Received May 01, 1982; Online November 11, 2009


A model, previously proposed, describing the sky radiance as a continuous function, has been calibrated from 11,000 individual measurements made in scans taken across springtime skies in Toronto using a narrow field of view radiometer. The model reproduces the measured sky radiance with a mean bias error under five percent and a root mean square error only slightly larger than the standard deviation of the measurements. The model is applied to the calculation of the ratio of the clear sky diffuse irradiance on a slope to that on a horizontal surface. Charts are presented for the direct determination of the expected values of these ratios for surfaces at three tilts and at any azimuth.

Copyright © 1987 by ASME
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