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A steel pipe has an outer diameter of 0.06 m. It is covered with a 0.05...

A steel pipe has an outer diameter of 0.06 m. It is covered with a 0.05 m thick layer of magnesia (k = 0.07 W m-1 K -1) which in turn is covered with a 0.04 m layer of fibreglass insulation (k = 0.048 W m-1 K -1). The pipe wall outside temperature is 380 K, and the outside surface temperature of the fibreglass is 310 K. What is the interfacial temperature between the magnesia and the fibreglass? [Q/L = {2*3.14159*(T1 - T2 )}/ ln(r1/r2) ]

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