%0 Journal Article %1 Vijayakumar.Kummert.ea2005 %A Vijayakumar, G. %A Kummert, M. %A Klein, S. A. %A Beckman, W. A. %D 2005 %J Solar Energy %K Diffuse, Minute, Short-term, Tilted radiation, solar %P 495--504 %T Analysis of short-term solar radiation data %V 79 %X 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.

@article{Vijayakumar.Kummert.ea2005, 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.}, added-at = {2011-09-01T13:26:03.000+0200}, author = {Vijayakumar, G. and Kummert, M. and Klein, S. A. and Beckman, W. A.}, biburl = {https://www.bibsonomy.org/bibtex/2a4a3472d364f91622cc352b341c12866/procomun}, file = {Vijayakumar.Kummert.ea2005.pdf:Vijayakumar.Kummert.ea2005.pdf:PDF}, interhash = {323f842c55699b292f86bd4873a07e06}, intrahash = {a4a3472d364f91622cc352b341c12866}, journal = {Solar Energy}, keywords = {Diffuse, Minute, Short-term, Tilted radiation, solar}, owner = {oscar}, pages = {495--504}, refid = {Vijayakumar.Kummert.ea2005}, timestamp = {2011-09-02T08:25:25.000+0200}, title = {Analysis of short-term solar radiation data}, volume = 79, year = 2005 }