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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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