Question: Two pipes are buried in an insulating material having k = 0.8 W/m C. One pipe is 10 cm in diameter and carries a hot

Two pipes are buried in an insulating material having k = 0.8 W/m· ºC. One pipe is 10 cm in diameter and carries a hot fluid at 300ºC while the other pipe is 2.8 cm in diameter and carries a cool fluid at 15ºC. The pipes are parallel and separated by a distance of 12 cm on centers. Calculate the heat-transfer rate between the pipes per meter of length.

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