Unformatted text preview: cm layer of fiberglass. The wall is subjected to an overall temperature difference of 560°C. Calculate the heat flow per unit area through the composite structure. Qualitatively sketch the temperature distribution. Use k A =386 W/m•K, k B =0.166 W/m•K, and k C =30 W/m•K for the thermal conductivities of copper, asbestos and fiberglass, respectively. 4. A planar solid undergoes steady onedimensional conduction without energy generation and with constant thermal conductivity k. The solid has crosssectional area A, thickness L, temperature T 1 at x=0 and temperature T 2 at x=L. Here, x is the position through the material in Cartesian coordinates. (a) Beginning with a differential control volume, derive the temperature distribution T(x). Clearly draw and label the control volume with differential length dx and all heat transfer rates. (b) Prove that the rate of heat transfer through the media is q=kA(T 1T 2 )/L....
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 Fall '08
 Kuznetsov
 Thermodynamics, Heat, Heat Transfer, 5cm, 25 mm, 30 W

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