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Clearness index estimation for spectral composition of direct and global solar radiations

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  • Rahoma, U. Ali

Abstract

Measurements of cloudless direct, global, and diffuse solar radiations, taken over a one year period at Helwan, are analyzed in terms of global index and diffuse fraction for clear-sky conditions. The dependence of the diffuse fraction on the global index was represented by a polynomial. These results support the use of routine instantaneous surface meteorological data to calculate global and diffuse radiations on a horizontal surface in the absence of any other radiation measurements. The spectral composition of the global solar-radiation was found to be 4.3% UV band, 32.5% band range 250-630 nm, 13.74% red band, 52.75% infrared band and 29.7% diffuse solar-radiation. The spectral distribution of direct solar-radiation ratio of the extraterrestrial solar radiation was found to be: 0.69% green and blue band, 47.5% yellow and orange band 45% red band, and 52.7% infra-red band.

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  • Rahoma, U. Ali, 2001. "Clearness index estimation for spectral composition of direct and global solar radiations," Applied Energy, Elsevier, vol. 68(4), pages 337-346, April.
    • Handle: RePEc:eee:appene:v:68:y:2001:i:4:p:337-346
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