Estimation of direct illuminance on a horizontal surface for clear and intermediate skies

L Robledo and A Soler

Renewable Energy, 2000, vol. 19, issue 1, 55-60

Abstract: In the present work two simple models have been obtained which may be used to estimate mean hourly direct illuminance for clear skies as a function of solar elevation. Also a simple model has been developed valid for all sky conditions when direct illuminance is available, that is, clear and intermediate skies, using solar elevation and brightness index as input parameters. The sky conditions are defined by the clearness index and the brightness index, both calculated from solar irradiances.

Date: 2000
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:19:y:2000:i:1:p:55-60

DOI: 10.1016/S0960-1481(99)00015-4

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