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International Journal of Technology Enhancements and Emerging Engineering Research (ISSN 2347-4289)
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IJTEEE >> Volume 3 - Issue 12, December 2015 Edition



International Journal of Technology Enhancements and Emerging Engineering Research  
International Journal of Technology Enhancements and Emerging Engineering Research

Website: http://www.ijteee.org

ISSN 2347-4289



A Comparative Study Of Various Sunshine Based Models For Estimating Global Solar Radiation In Zaria, North-Western, Nigeria

[Full Text]

 

AUTHOR(S)

D. O. Akpootu, H. T. Sulu

 

KEYWORDS

Keywords: global solar radiation, sunshine hours, statistical test, Angstrom model, Zaria-Nigeria.

 

ABSTRACT

ABSTRACT: Solar radiation is a primary driver of many physical, chemical and biological processes on the earth’s surface. In solar applications, one of the most important parameters needed is the long- term average daily global solar radiation. For locations where no actual measured values are available, a common practice is to estimate average daily global solar radiation using appropriate empirical correlations based on available measured meteorological data at that location. In this regard, twelve (12) different empirical models based on Angstrom-Prescott model were selected to estimate the monthly average daily global solar radiation on a horizontal surface for Zaria, Kaduna State, North-Western, Nigeria (Latitude 11.060N, Longitude 07.410E and altitude 110.9 m above sea level) during the period of thirty one years (1980 – 2010) using the measured global solar radiation and sunshine hour. The twelve (12) selected models were compared on the basis of the statistical error tests; Mean Bias Error (MBE), Root Mean Square Error (RMSE), Mean Percentage Error (MPE), t – test, and coefficient of correlation (R). Based on the MBE and t – test equation 16 is extremely recommended. Based on RMSE equation 15 is extremely recommended and based on MPE equation 13 is extremely recommended. The newly developed regression equations (16, 15 and 13) for estimating global solar radiation in Zaria-Nigeria are based on the modified sunshine based models of the Ampratwum and Dorvlo, Newland and Ogelman et al. models and are also applicable in estimating global solar radiation in regions with similar climatic information where solar radiation data are not available.

 

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