Question: Two parallel pipelines spaced 0.5 m apart are buried in soil having a thermal conductivity of 0.5 W/m K. The pipes have outer diameters

Two parallel pipelines spaced 0.5 m apart are buried in soil having a thermal conductivity of 0.5 W/m ∙ K. The pipes have outer diameters of 100 and 75 mm with surface temperatures of 175°C and 5°C, respectively. Estimate the heat transfer rate per unit length between the two pipelines.

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