A pipeline, used for the transport of crude oil, is buried in the earth such that its centerline is a distance of 1.5 m below the surface. The pipe has an outer diameter of 0.5 m and is insulated with a layer of cellular glass 100 mm thick. What is the heat loss per unit length of pipe when heated oil at 120°C flows through the pipe and the surface of the earth is at a temperature of 0°C? a. What is the thermal conductivity of Cellular glass at its average temperature of 365 K, in W/m.K? b. What is the thermal resistance of the Cellular glass for one meter of pipe length, in K/W? c. What is the shape factor for the soil thermal resistance for one meter of pipe length, in m? d. What is the total thermal resistance between the oil and the surface of the earth for one meter of pipe length, in K/W? e. What is the heat loss per unit length from the oil, in W/m?
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