Q:

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

A) 45mm B) 60mm
C) 75mm D) 90mm
 

View Answer Explanation

80