engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Heat Transfer Conduction Critical Thickness of Insulation
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
1
45 mm
2
60 mm
3
75 mm
4
90 mm