A long, uninsulated steam line with a diameter of89 mm and

Chapter 9, Problem 9.56

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A long, uninsulated steam line with a diameter of89 mm and a surface emissivity of 0.8 transportssteam at 200C and is exposed to atmospheric airand large surroundings at an equivalent temperatureof 20C.(a) Calculate the heat loss per unit length for a calm day. b) Calculate the heat loss on a breezy day when thewind speed is 8 m/s.(c) For the conditions of part (a), calculate the heatloss with a 20-mm-thick layer of insulation (k?0.08 W/m?K). Would the heat loss change signifi- cantly with an appreciable wind speed?

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