Correlations to estimate monthly mean daily solar global irradiation: application to Romania

Viorel Badescu

Energy, 1999, vol. 24, issue 10, 883-893

Abstract: Seven existing relationships between monthly mean clearness index and the number of bright sunshine hours are tested under the climate and latitude of Romania. New (best-fit) correlations are derived. They use bright sunshine hour number or fractional total cloud amount as input. The dependence of the new sunshine-based regressions on month is stronger than their dependence on latitude. They generally underestimate the clearness index in the first half-year and overestimate it in the rest of the year. The accuracy of the new regression seems not to depend significantly on the year.

Date: 1999
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Citations: View citations in EconPapers (16)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:24:y:1999:i:10:p:883-893

DOI: 10.1016/S0360-5442(99)00027-4

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