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An uninsulated steam pipe is used to transport hightemperature steam from one building to another. The pipe is of 0.5-m diameter, has a surface temperature of 150°C, and is exposed to ambient air at -10 °C. The air moves in cross flow over the pipe with a velocity of 5 m/s.
(a) What is the heat loss per unit length of pipe?
(b) Consider the effect of insulating the pipe with a rigid urethane foam (k = 0.026 W/m · K). Evaluate and plot the heat loss as a function of the thickness δ of the insulation layer for 0 ≤ δ ≤ 50 mm.
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