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A carbon steel (K = 54 W/m – k) pipe of OD 6 cm and 3 mm thick is carrying steam at 3000 c is to be insulated to reduce heat losses. The heat transfer coefficient between steam and the pipe surface is 120 W/m2 -k. The outer surface of the pipe may be assumed to be at 3000 c. It is desired to use 1 cm thick asbestos (K = 0.1105 W/m – k) and 1 cm glass wool (K = 0.038 W/m – k) insulation. The atmospheric air is at 300 c and the film coefficient between insulating layer and air is 10 W/m2 -k. Determine which insulating material is to be used as first layer of insulation? Why?
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