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Arlon
Online Engineering
Library - TechRef!
Conduction
Fourier's Law of Conduction
 = -kA(dT/dx), where
= rate of heat transfer.
Conduction through a plain wall:
= -kA(T2 - T1)/L, where
k = the thermal conductivity of the wall,
A = the wall surface area,
L = the wall thickness, and
T1, T2 = the temperature of the opposite surfaces of the wall.
Thermal Resistance of the wall is given by:
R = L/(kA)
Resistances in series are added.
Composite Walls:
Rtotal = R1 + R2, where
R1 = L1/(k1A)
R2 = L2/(k2A)
Surface and intermediate temperatures given by:
T2 = T1 - R1; T3 = T2 - R2
Cylindrical Walls:
 , where
L = cylinder length.
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