Prediction of solar global radiation on a surface tilted to the south

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations


Solar global and diffuse radiation intensities are, in general, measured on horizontal surfaces, whereas stationary solar conversion systems (both flat plate solar collector and PV) are tilted towards the sun in order to maximize the amount of solar radiation incident on the collector surface. Consequently, the solar radiation incident on a surface tilted to the south (northern hemisphere) must be determined by converting the solar radiation intensities measured on a horizontal surface to that incident on the tilted surface of interest. There exist a large number of models designed to perform such a conversion. Eleven such models have been tested utilizing data measured in Beer Sheva, Israel. The data consist of hourly solar global and diffuse radiation on a horizontal surface, normal incidence beam and global radiation on a south-oriented surface tilted at 40°. The individual model performance is assessed by an inter-comparison between the calculated and measured solar global radiation on the south-oriented surface tilted at 40° using both graphical and statistical methods. The relative performance of the different models under different sky conditions, i.e., clear, partially cloudy and cloudy as defined by the hourly clearness index value, has been studied.

Original languageEnglish
Title of host publicationOptical Modeling and Measurements for Solar Energy Systems II
StatePublished - 21 Nov 2008
EventOptical Modeling and Measurements for Solar Energy Systems II - San Diego, CA, United States
Duration: 13 Aug 200814 Aug 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceOptical Modeling and Measurements for Solar Energy Systems II
Country/TerritoryUnited States
CitySan Diego, CA


  • Diffuse models
  • Grading of models
  • Solar radiation
  • Tilted surface

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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