Numerical - Total thermal resistance of composite system in parallel - Heat Transfer

Q.  Consider a composite wall with two layers combined in parallel and heat is transferred through wall as shown in figure. The thermal resistances of two layers are R1 and R2 respectively. How is the total thermal resistance (R) of the wall calculated?
- Published on 11 Aug 15
Heat-Flow-through-Composite-Wall-with-Parallel-Layers.png


a. R = (R1 + R2) / R1R2
b. R = R1R2 / (R1 + R2)
c. R = R1 / (R1 + R2)
d. R = R2 / (R1 + R2)

ANSWER: R = R1R2 / (R1 + R2)

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