HEAT CONDUCTION IN MULTILAYERED

SYSTEMS

COMPOSITE RECTANGULAR WALL

(IN SERIES)

In a single layer, the rate of heat transfer is:

Then

or,

In the preceding equation, for the conditions described in the figure where q is positive in the right direction and T₀ >T₃, L_B, L_C and L_D will be negative values, (x₀-x₁, x₁-x₂, and x₂-x₃). Therefore,

Using the Resistance Concept:

and