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Figure 3.3 One-dimensional heat transfer [1 ] a: sphere, b: cylinder, c: plate
3.1.5 Heat Conduction in Composite Walls
Following the electrical analogy, heat conduction through a multiple layer wall can be
treated as a current flowing through resistances connected in series. With this concept
we obtain for the heat flow through the composite wall as shown in Figure 3.4
Adding Equation 3.14 to Equation 3.16 and setting A1=A2 = A3=A gives
Figure 3.4 Heat transfer through a composite wall [1 ]
(3.14)
(3.15)
(3.16)
(3.17)