Find the loading in kw and the efficiency of the tank

Posted on 2014-01-20 11:35:00 in Engineering by AVERY-RULER

A cuble water tank has surface area of 6.0 m² and is filled to 90% capacity six times daily. The water is heated from 20_oC to 65^oC. The losses per square meter of tank surface per 1^oC temperature difference are 6.3 watts. Find the loading in kw and the efficiency of the tank. Assume specific heat of water  = 4,200 J/kg/^oC and one kwh = 3.6 MJ.

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