Question: A 15-cm-diameter steam pipe at 150C is buried in the earth near a 5-cm pipe carrying chilled water at 5C. The distance between centers is

A 15-cm-diameter steam pipe at 150ºC is buried in the earth near a 5-cm pipe carrying chilled water at 5ºC. The distance between centers is 15 cm and the thermal conductivity of the earth at this location may be taken as 0.7 W/m· ºC. Calculate the heat lost by the steam pipe per unit length.

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