Estimation of Mean Monthly Solar Radiation Components and Clearness Index

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2016 by IJETT Journal
Volume-34 Number-1
Year of Publication : 2016
Authors : S. U. Muhammad, D. B. Yahaya, J. S. Enaburekhan


S. U. Muhammad, D. B. Yahaya, J. S. Enaburekhan"Estimation of Mean Monthly Solar Radiation Components and Clearness Index", International Journal of Engineering Trends and Technology (IJETT), V34(1),35-38 April 2016. ISSN:2231-5381. published by seventh sense research group

Estimation of the component of solar radiation was carried out to ascertain the feasibility of solar energy utilization in sudan and fresh water swamp vegetation zones, Nigeria. The results showed that the variation of direct and diffuse component of solar radiation is a function of the atmospheric conditions and elevation. A seasonal range of 0.477 – 0.664 and 0.377 – 0.567 for sudan and fresh water swamp respectively, were obtained. Also, correlation coefficient of more than 99% between the direct and diffuse component with clearness index, was obtained for all the zones.


[1] D. W. Medugu and D. Yakubu “Estimation of mean monthly global solar radiation in Yola – Nigeria using angstrom model,” Advances in Applied Science Research, vol. 2, pp. 414-42, 2011
[2] M. A. Ahmed, F. Ahmad and M. WAkhtar, M. W. (2009): “Estimation of Global and Diffuse Solar Radiation for Hyderabad, Sindh, Pakistan. Journal of Basic and Applied Sciences, vol. 5, no. 2, pp. 73-77
[3] M. A. Chendo. and A. A. Maduekwe “Hourly Global and Diffuse Radiation of Lagos, Nigeria – correlation with some atmospheric parameters,” Solar Energy, vol. 52, pp. 247 – 251, 1994.
[4] A. Skartveit and J. A. Olseth “A Model for the Diffuse Fraction of Hourly Global Radiation. Solar Energy,” vol. 38, pp. 271 – 274, 1987
[5] L. E. Akpabio and S. E. Etuk “Relationship Between Global Solar Radiation and Sunshine Duration for Onne, Nigeria,” Turkish Journal of Physics, vol. 27, pp. 161 – 167, 2003
[6] A. S. Sambo and M. A. C. Doyle “Estimation of the Global and Diffuse Components of Solar Radiation for Some Nigerian Cities,” Nigerian Journal of Solar Energy, vol. 5, pp. 16 – 24, 1986.
[7] Vegetation zones (Federal Republic of Nigeria) igeria_veg_1979.opg-window (2010)
[8] J. Kondo, T. Nakamura and T. Yamazaki “Estimation of the Solar and Downward Atmospheric Radiation,” Tenki, vol. 38, pp 41-48, 1991
[9] J. K. Page “Estimation of Monthly Mean value of Daily Shortwave Radiation on Vertical and Inclined Surfaces from Sunshine Records for Latitude 400N – 400S,” in Proc. of the UN Conference on New Sources of Energy, 1964, vol. 4, pp 378
[10] Y. H. Liu and R. C Jordan “The inter relationship and characteristic distribution of direct, diffuse and total solar radiation from metrological data,” Solar Energy, vol. 4, pp. 1-19, 1960.

Direct solar radiation, diffuse solar radiation, Clearness index, vegetation zone, solar radiation.