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7-58 Consider a 50-cm-diameter and 95-cm-long hot water tank. The tank is placed on the roof of a house. The water inside the tank is

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7-58 Consider a 50-cm-diameter and 95-cm-long hot water tank. The tank is placed on the roof of a house. The water inside the tank is heated to 80C by a flat-plate solar collector during the day. The tank is then exposed to windy air at 18C with an average velocity of 40km/h during the night. Estimate the temperature of the tank after a 45mm period. Assume the tank surface to be at the same temperature as the water inside, and the heat transfer coefficient on the top and bottom surfaces to be the same as that on the side surface

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