Abstract
ABSTRACT Experiments were conducted to study the major characteristics of solar radiation transmittance of a prototype greenhouse glazed with double-walled acrylic panels and a polystyrene-pellet insulation system. A group of radiometers was used to measure radiation transmittance for both clear and overcast days and for different percentages of pellet shading. Diffuse radiation transmit-tance was found to be independent of solar position. For clear days, solar radiation transmittance was the highest at noon and during the diffuse periods of sunrise and sunset. Linear relationships between the solar radiation transmittance and the percentage of pellet shading were established.
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