Q3. A steel pipe (K = 45.0 W/mK) having a 0.05m Q is covered with a 0.042 m thick layer of

magnesia (K = 0.07W/mK) which in turn covered with a 0.024 m layer of fiberglass insulation

(K = 0.048 W/mK). The pipe wall outside temperature is 370 K and the outer surface

temperature of the fiberglass is 305K. What is the interfacial temperature between the magnesia

and fiberglass? Also calculate the steady state heat transfer. [10 marks]

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