Question: Two pipes are buried in the earth and maintained at temperatures of 200 and 100C. The diameters are 9 and 18 cm, and the distance

Two pipes are buried in the earth and maintained at temperatures of 200 and 100ºC. The diameters are 9 and 18 cm, and the distance between centers is 40 cm. Calculate the heat-transfer rate per unit length if the thermal conductivity of earth at this location is 1.1 W/m· ºC.

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