A pipe of outside diameter₂0 mm is to be insulated with asbestos which has a m

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A pipe of outside diameter₂0 mm is to be insulated with asbestos which has a mean thermal conductivity of 0.1 W/m degree. The local coefficient of convective heat to the surroundings is 5 W/square meter degree. Find the critical radius of insulation for optimum heat transfer from pipe?

Options:

A . 10 mm

B . 20 mm

C . 30 mm

D . 40 mm

Answer: Option B
Answer: (b).20 mm

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