Analysis of short-term solar radiation data

G. Vijayakumar, M. Kummert, S.A. Klein, W.A. Beckman

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56 Citations (Scopus)
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Solar radiation data are available for many locations on an hourly basis. Simulation studies of solar energy systems have generally used these hourly values to estimate long-term annual performance, although solar radiation can exhibit wide variations during an hour. Variations in solar radiation during an hour, such as on a minute basis, could result in inaccurate performance estimates for systems that respond quickly and non-linearly to solar radiation. In addition, diffuse fraction regressions and cumulative frequency distribution curves have been developed using hourly data and the accuracy of these regressions when applied to short-term radiation has not been established. The purpose of this research is to investigate the inaccuracies caused by using hourly rather than short-term (i.e., minute and 3 min) radiation data on the estimated performance of solar energy systems. The inaccuracies are determined by examination of the frequency distribution and diffuse fraction relationships for short-term solar radiation data as compared to existing regressions and by comparing calculated radiation on tilted surfaces and utilizability based on hourly and short-term radiation data.
Original languageEnglish
Pages (from-to)495-504
Number of pages9
JournalSolar Energy
Issue number5
Early online date10 Feb 2005
Publication statusPublished - 30 Nov 2005


  • solar radiation
  • solar energy systems
  • diffuse fraction relationships
  • calculated radiation


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