Abstract
The hourly system performance of a thermosyphon solar water heater, with the flat plate collector as the only system component insulated, was experimentally investigated for several weeks under no-load conditions in the northern Nigerian city of Bauchi (lat 10.3°N, long 9.8°E). The single glazed collector was made from pre-formed (corrugated) stainless steel and had an effective absorber area of 1.4 m 2. The 75-1. Capacity galvanized steel storage tank carried no insulation. The collector was tilted at an angle of 30° to the horizontal and facing 15° east of due south. Comparison of typical system and operating characteristic curves with published data for fully insulated units revealed no fundamental departure from known thermosyphon system behaviour during the hours of sunshine. However, even without tank insulation, daytime mean tank temperature rises of more than 25°C were recorded under local weather conditions, with an overall system efficiency of 39%.
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