Abstract
The objective of this study was to analyse one year of hourly solar radiation data from Georgetown, Guyana, and derive a simplified tool in the form of a utilizability curve for designing solar thermal systems with fixed flatplate collectors. The significance of the utilizability curve is demonstrated with the solution of a typical design problem—the sizing of solar crop drying systems. For instance it is shown that an advanced flatplate collector [ U/ η 0 = 3 W/m 2°C and F R( τα) = 0.95 with A c = 16 m 2, delivers 29.6 MJ of energy per hour while heating ambient air from 30 to 50°C.
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