Optimization of the Geometry and Material of Solar Water Heaters (original) (raw)

Abstract

ABSTRACT This study includes three parts; optimization of the geometry of absorber plate for flat plate collectors, construction of new absorber plate and efficiency tests of collectors. The new absorber plate, which is economic and resembling the commercially available absorber plate has been built by hot deep galvanization and by utilization of point welding. Before building the components of the system, some of the geometrical parameters, which influence the performance, have been optimized. Time constant and thermal efficiency of the constructed absorber plate has been measured. A new type of efficient and cheap absorber plate, which is made up of galvanized iron was constructed and its efficiency and price were determined together with that of three commercially available collectors constructed in Turkey, absorber plates of which are made up of aluminum and copper (�STEK Aluminum and Copper, DA�SAN -Copper). Time constants of the tested collectors are determined to be 137 seconds for �STEK Al, 75 seconds for �STEK Cu, 95 seconds for DA�SAN and 198 seconds for galvanized iron collector. For �STEK’s aluminum collector the y-axis intercept of the efficiency curve is 0.90, for �STEK’s copper collector it is 0.66; for DA�SAN’s copper it is 0.81 and for the collector that has galvanized iron absorber plate it is 0.82, which is increased up to 0.83 after new optimization. The price of the constructed absorber plate was DM 43, after new optimization it is increased to DM 53. For �STEK’s aluminum collector it is DM 100, for �STEK’s copper collector it is DM 60 and for DA�SAN’s copper collector it is DM 100.

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