Show work Exxon is conducting heat loss analysis on its buried pipelines that ar

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Exxon is conducting heat loss analysis on its buried pipelines that are used to transport crude oil line in Alaska, The surface temperature of the earth there is 5degreeC. The pipe has an outer diameter of 15 cm and has a length of 4 m. It is buried in the earth at a depth of 20 cm to its outer surface. The pipe wall temperature is to be maintained at 75 degree C Calculate the heat loss by the pipe assuming the thermal conductivity of the earth is 0.8 W/m K What is the heat loss if it is insulated with a layer of cellular glass 100 mm thick?

Explanation / Answer

a) Q=kAdt/dx=0.8*0.15*4*(75-5)/0.2

      = 168 W

b) we need k value for celluar glass

and follow the same formula

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