Question

A thin-walled metal pipe of diameter 7.50 cm and length 6.20 m is used to transport 20.0 grams of st eam at 100 O C every second. The pipe is surrounded by insulation with k = 0.0400 W/m-K. How thick must the insulation be if only 0.500% of the steam is allowe d to condense inside the pipe when the external temperature (i.e. outside the pipe) is 20.0 O C?

answer is 2.76 cm

Answer 1