Hot water at an average temperature of 85°C passes through a row of eight parallel pipes that are 4 m have an outer diameter of 3 cm, located vertically in the middle of a concrete wall (k = 0.75 W/m · °C) that is 4 m high, 8 m long, and 15 cm thick. If the surfaces of the concrete walls are exposed to a medium at 32°C, with a heat transfer coefficient of 12 W/m2 · °C, determine the rate of heat loss from the hot water and the surface temperature of the wall.
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