Global solar radiation estimation in Algeria

In this paper, two models for estimating monthly average daily global radia tion on a horizontal surface have been applied to four different locations. The first one is an empirical model, originally formulated by Barbaro et a l. (Solar Energy 20 (1978) 431). Some modifications have been suggested. Th e second one is a regression equation of the Angstrom type. The agreement b etween the measured and the computed values is remarkable, and the models a re both recommended for use in Algeria and in any location with similar cli matic parameters. (C) 2001 Elsevier Science Ltd. All rights reserved.