Question: A 50-mm-diameter, thin-walled metal pipe covered with a 25-mm-thick layer of insulation (0.085 W/m K) and carrying superheated steam at atmospheric pressure is suspended

A 50-mm-diameter, thin-walled metal pipe covered with a 25-mm-thick layer of insulation (0.085 W/m ∙ K) and carrying superheated steam at atmospheric pressure is suspended from the ceiling of a large room. The steam temperature entering the pipe is 120°C, and the air temperature is 20°e. The convection heat transfer coefficient on the outer surface of the covered pipe is 10 W/m2 ∙ K. If the velocity of the steam is 10 m/s, at what point along the pipe will the steam begin condensing?

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