An insulating material with a thermal conductivity, k = 0.12 W/mK is used for a pipe carrying steam. The local coefficient of heat transfer (h) to the surroundings is 4 W/m2K. In order to provide effective insulation, the minimum outer diameter of the pipe should be

An insulating material with a thermal conductivity, k = 0.12 W/mK is

1.	An insulating material with a thermal conductivity, k = 0.12 W/mK is used for a pipe carrying steam. The local coefficient of heat transfer (h) to the surroundings is 4 W/m2K. In order to provide effective insulation, the minimum outer diameter of the pipe should be
A.	45 mm
B.	60 mm
C.	75 mm
D.	90 mm
Answer» C. 75 mm

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An insulating material with a thermal conductivity, k = 0.12 W/mK is used for a pipe carrying steam. The local coefficient of heat transfer (h) to the surroundings is 4 W/m2K. In order to provide effective insulation, the minimum outer diameter of the pipe should be

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