A novel approach for calculating the monthly average daily fraction of diffuse solar radiation

A. I. Kudish, D. Wolf, Y. Machlav

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A novel approach for calculating the monthly average daily fraction of diffuse radiation has been developed. It is based upon the use of concurrent total solar radiation measurements for both a tilted surface and a horizontal surface. It divides the data into two categories, clear and cloudy day, on an hourly basis. The clear day data is analyzed by means of both Liu and Jordan's and Page's empirical equations. The cloudy day data is analyzed by Liu and Jordan's equation for determining the insolation ratio on a tilted to a horizontal surface. A monthly average value for the diffuse fraction is then determined by calculating a weighted average of the clear and cloudy day values. The monthly average values, for twelve months of Beer Sheva data, for the fraction of diffuse radiation have been calculated and compared to the empirical relationships derived by Liu and Jordan and Page. The agreement between the calculated values and empiriical relationship is somewhat better in the latter case.

Original languageEnglish
Pages (from-to)181-186
Number of pages6
JournalSolar Energy
Volume28
Issue number3
DOIs
StatePublished - 1 Jan 1982

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