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ISSN Druckformat: 2150-3621
ISSN Online: 2150-363X
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DESIGN, CONSTRUCTION, AND TESTING OF A CYLINDRICAL SOLAR WATER HEATER
ABSTRAKT
The design, construction, and performance test of a cylindrical solar water heater are presented. It consists of a transparent 900 mm long and 300 mm diameter cylindrical tube made from a 2 mm thick polyvinyl chloride (PVC) material housing a spiral copper tube painted black for improved solar energy harvesting. The copper tube is 15,000 mm long with outer and inner diameters of 12.70 and 11.40 mm, respectively. The transparent PVC material acts as the glazing. Experimental tests on the system were carried out for three different mass flow rates of 10.8, 7.2, and 3.6 kg/h. The results reveal that the maximum efficiency obtained during the test period were 57.09%, 53.99%, and 56.21%, respectively, for mass flow rates of 3.6, 7.2, and 10.8 kg/h. The Hottel−Whillier−Bliss characterization test performed on the solar water heater revealed an intercept on the y axis of 0.30−0.40, while the gradient gave values in the range of −2.94 to −6.91. Overall, the solar water heater has the potential of generating hot water at a very fast rate, with a response time to insolation change that is less than 30 minutes.
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