For the wall in Problem 3-6 a material with k = 1.4 W/m C is used. The

Question:

For the wall in Problem 3-6 a material with k = 1.4 W/m· ºC is used. The inner and outer wall temperatures are 650 and 150ºC, respectively. Using a numerical technique, calculate the heat flow through the wall.
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.