Abstract
A solar water heater was built to supply the energy requirements of a water desalinization pilot plant. Various types of construction were used before the final design was established. Some of the problems encountered are discussed in this paper. It was found that the heater had to be insulated from the ground. Experience with plastic-film materials was generally unfavorable. Even the weather-resistant Tedlar had a comparatively short life. The design finally used consisted of a butyl-rubber tube seven feet wide and fifty feet long. The tube was protected with a layer of plastic glazing covered in turn by a layer of glass. Performance data for the heater are given and discussed. The results are compared with efficiencies computed from a correlation formula developed from an extensive test program using small solar test cells.
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