Abstract
Statistical and experimental methods are used to determine the optical efficiency and the heat lost by radiation and convection in a horizontal plastic solar hot water heater. The heater consisted of a water filled polyethylene bag with a clear top and black bottom. It was insulated on the sides and bottom by styrofoam and covered on the top with one to three layers of clear Tedlar. The effective sun angle, effective sky temperature, ambient temperature and the number of covers are included as variables. The upward heat losses were higher than those predicted by the heat transfer coefficients of Hottel and Woertz.
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