Abstract
CALCULATION of the probable intensity of solar radiation on a surface which is inclined to the horizontal and at any attitude or azimuth relative to the Sun's meridian is frequently necessary in solar engineering research. The usual practice has been to perform such a calculation by separating the direct component of insolation and the diffuse component of sky radiation and to combine these according to the geometry of the system1. The assumption is made that the sky radiation is uniformly distributed from all directions, but this is known not to be the case for bright Sun or cloudless conditions, when the diffuse radiation is more intense in the vicinity of the Sun2. Hence the normal procedure as already described here is not valid except for surfaces which are horizontal.
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References
Robinson, N., and Rechnitzer, D., Coopération Mediterranéenne pour l'Energie Solaire, No. 4, 18 (1963).
Kandratyev, K. J., and Manolova, M. P., Solar Energy, 4, No. 1, 14 (1960).
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HEYWOOD, H. Solar Radiation on Inclined Surfaces. Nature 204, 669–670 (1964). https://doi.org/10.1038/204669a0
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DOI: https://doi.org/10.1038/204669a0
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