A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5 W/m2K . It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?
Adding the insulation will reduce the heat loss
The critical insulation radius is k/h=0.05/5=0.01 m. The existing outer radius is 0.0125 m, already above critical. Adding insulation increases total thermal resistance and reduces heat loss.
Important Questions from Critical Thickness of Insulation
Two insulating materials of thermal conductivity K and 2K are available for lagging a pipe carrying a hot fluid. If the radial thickness of each material is the same.
For pipes, the radius of the pipe is taken higher than the critical radius, so that any insulation added will ______.
The insulating ability of an insulator with the presence of moisture would
A steam pipe is to be insulated by 2 insulating materials put over each other. For best results
The critical radius of insulation signifies
