For the wall in Problem 3-6 a material with k = 1.4 W/m C is used. The
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Problem 3-6
A heavy-wall tube of Monel, 2.5-cm ID and 5-cm OD, is covered with a 2.5-cm layer of glass wool. The inside tube temperature is 300ºC, and the temperature at the outside of the insulation is 40ºC. How much heat is lost per foot of length? Take k = 11 Btu/h · ft · ºF for Monel.
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