### Abstract

Language | English |
---|---|

Pages | 495-504 |

Number of pages | 9 |

Journal | Solar Energy |

Volume | 79 |

Issue number | 5 |

DOIs | |

Publication status | Published - Nov 2005 |

### Fingerprint

### Keywords

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

### Cite this

*Solar Energy*,

*79*(5), 495-504. https://doi.org/10.1016/j.solener.2004.12.005

}

*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.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Analysis of short-term solar radiation data

AU - Vijayakumar, G.

AU - Kummert, M.

AU - Klein, S.A.

AU - Beckman, W.A.

PY - 2005/11

Y1 - 2005/11

N2 - 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.

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.

KW - Solar Radiation

KW - Solar Energy Systems

KW - Diffuse Fraction Relationships

KW - Calculated Radiation

UR - http://dx.doi.org/10.1016/j.solener.2004.12.005

U2 - 10.1016/j.solener.2004.12.005

DO - 10.1016/j.solener.2004.12.005

M3 - Article

VL - 79

SP - 495

EP - 504

JO - Solar Energy

T2 - Solar Energy

JF - Solar Energy

SN - 0038-092X

IS - 5

ER -