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 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?​


Nov 11, 2021
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