Abstract
A flat plate heat collector was constructed for the purpose of heating water by solar energy. It was erected facing south, tilted to the horizontal at the optimum tilt angle, and tested under the weather conditions typical to the U.A.R., for the different rates of flow. It was found, for the dimensions of the collector (0.8 m2) that the best rate of flow is about 12 l/h and that the corresponding rise in the temperature of the flowing water is about 40° C. The overall heat transfer coefficient and the efficiency of the collector were investigated. On the average, when the rate of flow ranges between 5 and 12 l/h, the efficiency was found to be about 45 percent.
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