Question: nsider a 5 0 - cm - diameter and 9 5 - cm - long hot water tank. The tank is placed on the roof

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

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