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Frontiers in Energy

ISSN 2095-1701

ISSN 2095-1698(Online)

CN 11-6017/TK

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Front Energ    2013, Vol. 7 Issue (2) : 214-222    https://doi.org/10.1007/s11708-013-0241-2
RESEARCH ARTICLE
Correlations for estimating solar radiation using sunshine hours and temperature measurement in Osogbo, Osun State, Nigeria
O. S. OHUNAKIN1(), M. S. ADARAMOLA2, O. M. OYEWOLA3, R. O. FAGBENLE4
1. Mechanical Engineering Department, Covenant University, Ota 11001, Ogun State, Nigeria; 2. Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, N-7491, Norway; 3. Department of Mechanical Engineering, University of Ibadan, Ibadan 200284, Nigeria; 4. Department of Mechanical Engineering, Obafemi Awolowo University, Ile-Ife 220005 Osun State, Nigeria
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Abstract

In this study, the global solar radiation on horizontal surface in Osogbo, Osun state, Nigeria was analyzed using 11-year data (1997–2007). Correlations using linear and quadratic expressions were developed to relate the global solar radiation on horizontal surface based on relative sunshine hours and temperature measurements for evaluating the monthly average daily global solar radiation. The calculated monthly clearness index values indicate that the prevailing weather condition in Osogbo is heavily overcast. All the developed quadratic correlations gave better correlation coefficients (0.834, 0.872 and 0.823 respectively) than the linear models. However, the Hargreaves and Samani related based quadratic model gave the best among the three developed quadratic expressions and is therefore suggested for estimating the monthly global radiation in this site and its surroundings.
Keywords global solar radiation      Hargreaves model      sunshine hour      ambient temperatures      Osogbo     
Corresponding Author(s): OHUNAKIN O. S.,Email:olayinka.ohunakin@covenantuniversity.edu.ng   
Issue Date: 05 June 2013
 Cite this article:   
O. S. OHUNAKIN,M. S. ADARAMOLA,O. M. OYEWOLA, et al. Correlations for estimating solar radiation using sunshine hours and temperature measurement in Osogbo, Osun State, Nigeria[J]. Front Energ, 2013, 7(2): 214-222.
 URL:  
https://academic.hep.com.cn/fie/EN/10.1007/s11708-013-0241-2
https://academic.hep.com.cn/fie/EN/Y2013/V7/I2/214
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