A hot-water cylinder contains 150 liters of water it is


A hot-water cylinder contains 150 liters of water. It is insulated, and its outer surface has an area of 3.5 m^2. It is located in an area where the ambient air is 250C, and the overall heat transfer coefficient between the water and the surroundings is 1.0 W/m2 K, based on outer surface area. If there is a power failure, how long will it take the water to cool from 650C to 400C? Take the density of water as 980 kg/m3 and its specific heat as 4180 J/kg K.

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Mechanical Engineering: A hot-water cylinder contains 150 liters of water it is
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