ABSTRACT The hourly solar radiation data required for solar energy system design evaluation and performance studies is gener-ally not available for a number of sites especially in remote locations. As such accurate determination of hourly solar radiation data, is important both at horizontal; surfaces and inclined surfaces. A model to estimate global solar radiation using temperature and sunshine hour data has been developed (Chandel et al. ) which is used to calculate the hourly solar radiation Data. The hourly solar radiation has also been calculated using Gueymard  daily integration approach from the measured daily solar radiation data. These two predicted hourly solar radiation data values are compared with measured hourly values to test the accuracy of the models. The total solar radiation on the inclined surfaces and vertical surfaces for different orientations, have also been estimated. The estimated values are found to be in close agreement with measured values. The method presented can be used to estimate hourly, global, diffuse solar radiation for horizontal surfaces and total solar radiation on inclined and vertical surfaces at different orientations with greater accuracy for any location.
Cite this paper
nullS. Chandel and R. Aggarwal, "Estimation of Hourly Solar Radiation on Horizontal and Inclined Surfaces in Western Himalayas," Smart Grid and Renewable Energy, Vol. 2 No. 1, 2011, pp. 45-55. doi: 10.4236/sgre.2011.21006.
 S. S. Chandel, R. K. Aggarwal and A. N. Pandey, “New Correlation to Estimate Global Solar Radiation on Horizontal Surfaces Using Sunshine Hour and Temperature Data for Indian Sites,” Solar Energy Engineering Journal, Vol. 127, No. 3, 2005, pp. 417-420. doi:10.1115/1.1877512
 C. Gueymard, “Prediction and Performance Assessment of Mean Hourly Global Radiation,” Solar Energy, Vol. 68, No. 3, 2000, pp. 285-303. doi:10.1016/S0038-092X(99)00070-5
 J. F. Orgill and K. G. Hollands T, “Correlation Equation for Hourly Diffuse Radiation on Horizontal Surfaces,” Solar energy, Vol. 19, No. 4, 1977, pp. 357-359. doi:10.1016/0038-092X(77)90006-8
 S. A. Klein, “Calculation of Monthly Average Insolation on Tilted Surfaces,” Solar Energy, Vol. 19, 1977, pp 325-329. doi:10.1016/0038-092X(77)90001-9
 A. Whillier, “The Determination of Hourly Values of Total Solar Radiation from Daily Summations,” Theoretical and Applied Climatology, Vol. 7, No. 2, pp. 197-204.
 B. Y. H. Liu and R. C. Jordan, “The Inter Relationship and Characteristics Distribution of Direct, Diffuse and Total Solar Radiation,” Solar Energy, Vol. 4, No. 3, 1960, pp. 1-19. doi:10.1016/0038-092X(60)90062-1
 A. Mani, “Handbook of Solar Radiation Data for India,” Allied Publishers Pvt. Ltd., New Delhi, 1980.
 J. A. Duffie and W. A. Beckman, “Solar Engineering of Thermal Process,” John Willy & Sons, New York, 1980.
 N. Robinson, “Solar Radiation,” Elsevier, New York, 1966..
 K. J. A. Revfein, “A Simple Procedure for Estimating Global Daily Radiation on Any Surfaces,” Journal of Applied Meteorology, Vol. 17, No. 8, 1978, pp. 1126-1131. doi:10.1175/1520-0450(1978)017<1126:ASPFEG>2.0.CO;2
 K. Katiyar and C. K. Panday, “Study of Ground-Reflected Component and Its Contribution in Diffuse Solar Radiation Incident on Inclined Surfaces over India,” International Journal of Energy and Environment (IJEE), Vol. 1, No. 3, 2010, pp. 547-554.
 A. A. El-Sebaii, F. S. Al-Hazmi, A. A. Al-Ghamdi and S. J. Yaghmour, “Global, Direct and Diffuse Solar Radiation on Horizontal and Tilted Surfaces in Jeddah, Saudi Arabia,” Applied Energy, Vol. 87, No. 2, 2010, pp. 568-576. doi:10.1016/j.apenergy.2009.06.032