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Journal of Renewable and Sustainable Energy / Volume 1 / Issue 4 / REGULAR ARTICLES

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J. Renewable Sustainable Energy 1, 043109 (2009); doi:10.1063/1.3192749 (6 pages)

New correction factor for the estimation of solar radiation

R. K. Aggarwal

Department of Environmental Science, Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni-Solan, Himachal Pradesh 173 230 India

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(Received 20 February 2009; accepted 9 July 2009; published online 7 August 2009)

A new correction factor (CFyear) depending upon the longitude and altitude of a location has been introduced in place of the clearness index (Kt year) used for the estimation of solar irradiation H. Thirty different geographical locations have been taken for comparing the values of Kt year and CFyear. The results show that the values of Kt year and CFyear are in close agreement, having variation within 10%. The estimated values of H for Kt year and CFyear have also been compared using 15 year measured data of 11 Indian cities to establish the accuracy of the CF over Kt. The annual mean percentage error between the estimated and measured values of these locations has been found to be within 10%. The monthwise variation in the estimated values of the 11 Indian cities compared with their measured values also proved the better accuracy of CF than Kt. The study reveals that solar radiation can be estimated using CF without applying any meteorological parameters for the locations having a longitude range of ±70 to ±125.

© 2009 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. METHODOLOGY
  3. RESULTS AND DISCUSSION
    1. Statistical method for accuracy of the models
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

mean square error methods, solar power, solar radiation

PACS

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.3192749

PUBLICATION DATA

ISSN:

1941-7012 (print)  
1941-7012 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

  1. C. Gueymard, Sol. Energy 68, 285 (2000). [Inspec]
  2. H. C. Hottel, Sol. Energy 18, 129 (1976).
  3. P. J. Lunde, Solar Thermal Engineering Space Heating and Hot Water Systems (Wiley, New York, 1980).
  4. Energy Systems Engineering, IIT, Mumbai and Solar Energy Center, MNES, Government of India, Manual on Solar Passive Architecture, 2000.
  5. A. Mani, Handbook of Solar Radiation Over India (Allied, New Delhi, 1980).

Tables

Table I. Comparison between Kt year with CFyear for various 30 locations (Gueymard, Ref. 1).

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Table II. Estimated values of Hyear (kW h/m2) using Kt and CF for 11 Indian locations and comparison between MPE(G) and MPE(N).

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Table III. Months in which the percentage error using CF is smaller than using Kt for the Indian sites.

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Table IV. Monthwise values of H using CF and Kt for 11 Indian sites.

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