Correlation Between Ultraviolet Radiation and Global Radiation in Riyadh, Saudi Arabia

[+] Author and Article Information
A. M. Mujahid

Mechanical Engineering Department, College of Engineering, King Saud University, P. O. Box 800, Riyadh 11421, Saudi Arabia

J. Sol. Energy Eng 116(1), 63-66 (Feb 01, 1994) (4 pages) doi:10.1115/1.2930067 History: Received November 22, 1991; Revised August 24, 1993; Online June 06, 2008


The global ultraviolet and global radiation were measured and recorded on an hourly basis in Riyadh, Saudi Arabia (lat. 24.6°N, long. 46.7°) during the period 1984–1989. Global radiation, G, was measured by an Eppley PSP pyranometer (0.285≤λ≤2.8 μm) and an Eppley TUVR radiometer (0.29≤λ≤0.385 μm) was used for the measurement of the ultraviolet radiation, UV. Both instruments were mounted on a horizontal surface. The results showed that the monthly average daily ultraviolet radiation was 197.6 Whm−2 . The ratio of the monthly average daily ultraviolet radiation to the monthly average daily global radiation (Ku ) varied between 0.031 to 0.037, with a mean value of 0.034. Comparison with results obtained in Kuwait, Dhahran, and Makkah showed that the data of Riyadh are in good agreement with those of Makkah and Dhahran; however, it underestimates Kuwait data. A regression correlation between Ku and KT (the ratio of the monthly average daily values of global radiation to extraterrestrial radiation) is developed. Another regression correlation between ultraviolet and global radiation on an hourly basis is also developed.

Copyright © 1994 by The American Society of Mechanical Engineers
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