naa a22 4500 510731848 CHVBK 20180411082955.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s11708-013-0241-2 doi (NATIONALLICENCE)springer-10.1007/s11708-013-0241-2 Correlations for estimating solar radiation using sunshine hours and temperature measurement in Osogbo, Osun State, Nigeria [Elektronische Daten] [O. Ohunakin, M. Adaramola, O. Oyewola, R. Fagbenle] 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. Higher Education Press and Springer-Verlag Berlin Heidelberg, 2013 global solar radiation nationallicence Hargreaves model nationallicence sunshine hour nationallicence ambient temperatures nationallicence Osogbo nationallicence Ohunakin O. Mechanical Engineering Department, Covenant University, 11001, Ota, Ogun State, Nigeria aut Adaramola M. Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491, Trondheim, Norway aut Oyewola O. Department of Mechanical Engineering, University of Ibadan, 200284, Ibadan, Nigeria aut Fagbenle R. Department of Mechanical Engineering, Obafemi Awolowo University, 220005, Ile-Ife, Osun State, Nigeria aut Frontiers in Energy SP Higher Education Press 7/2(2013-06-01), 214-222 2095-1701 7:2<214 2013 7 11708 https://doi.org/10.1007/s11708-013-0241-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11708-013-0241-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ohunakin O. Mechanical Engineering Department, Covenant University, 11001, Ota, Ogun State, Nigeria aut NATIONALLICENCE 700 1- Adaramola M. Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491, Trondheim, Norway aut NATIONALLICENCE 700 1- Oyewola O. Department of Mechanical Engineering, University of Ibadan, 200284, Ibadan, Nigeria aut NATIONALLICENCE 700 1- Fagbenle R. Department of Mechanical Engineering, Obafemi Awolowo University, 220005, Ile-Ife, Osun State, Nigeria aut NATIONALLICENCE 773 0- Frontiers in Energy SP Higher Education Press 7/2(2013-06-01), 214-222 2095-1701 7:2<214 2013 7 11708 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer