An Algorithm for Calculating Monthly-Average Radiation on Inclined Surfaces

[+] Author and Article Information
S. A. Klein, J. C. Theilacker

Solar Energy Laboratory, University of Wisconsin-Madison, Madison, Wis. 53706

J. Sol. Energy Eng 103(1), 29-33 (Feb 01, 1981) (5 pages) doi:10.1115/1.3266201 History: Received May 12, 1980; Revised October 02, 1980; Online November 11, 2009


An analytical method is developed for estimating R , the ratio of the long-term monthly-average daily radiation on an inclined surface to that on a horizontal surface. This method differs from the Liu and Jordan [1] method in the manner in which the beam radiation component is determined. The method is applicable for surfaces of any orientation. R values calculated in this manner and by the Liu and Jordan method are compared with integrated hourly calculations for 23 years in Madison, WI, Albuquerque, NM and Miami, FL; the comparisons show that the method described in this paper agrees more closely with the integrated hourly calculations, especially for surfaces facing east or west of south.

Copyright © 1981 by ASME
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