Analysis of short-term solar radiation data

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

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

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.
LanguageEnglish
Pages495-504
Number of pages9
JournalSolar Energy
Volume79
Issue number5
DOIs
Publication statusPublished - Nov 2005

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Solar radiation
Radiation
Solar energy

Keywords

  • Solar Radiation
  • Solar Energy Systems
  • Diffuse Fraction Relationships
  • Calculated Radiation

Cite this

Vijayakumar, G., Kummert, M., Klein, S. A., & Beckman, W. A. (2005). Analysis of short-term solar radiation data. Solar Energy, 79(5), 495-504. https://doi.org/10.1016/j.solener.2004.12.005
Vijayakumar, G. ; Kummert, M. ; Klein, S.A. ; Beckman, W.A. / Analysis of short-term solar radiation data. In: Solar Energy. 2005 ; Vol. 79, No. 5. pp. 495-504.
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Vijayakumar, G, Kummert, M, Klein, SA & Beckman, WA 2005, 'Analysis of short-term solar radiation data' Solar Energy, vol. 79, no. 5, pp. 495-504. https://doi.org/10.1016/j.solener.2004.12.005

Analysis of short-term solar radiation data. / Vijayakumar, G.; Kummert, M.; Klein, S.A.; Beckman, W.A.

In: Solar Energy, Vol. 79, No. 5, 11.2005, p. 495-504.

Research output: Contribution to journalArticle

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AB - 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.

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Vijayakumar G, Kummert M, Klein SA, Beckman WA. Analysis of short-term solar radiation data. Solar Energy. 2005 Nov;79(5):495-504. https://doi.org/10.1016/j.solener.2004.12.005