Question: 4) A hot steam pipe having an inside surface temperature of 250C has an inside diameter of 8cm and a wall thickness of 5.5mm. It

4) A hot steam pipe having an inside surface temperature of

4) A hot steam pipe having an inside surface temperature of 250C has an inside diameter of 8cm and a wall thickness of 5.5mm. It is covered with a 9 -cm layer of insulation having k=0.5W/mC, followed by a 4cm layer of insulation having k=0.25W/mC. The outside temperature of the insulation is 20C. Calculate the heat lost per meter of length. Assume k=47W/mC for the pipe

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