Total thermal resistance of composite system in series - Heat Transfer

Q.  When a composite wall of three layers in series having thermal resistances R1, R2 and R3 respectively, the heat transfer takes place normal to the surface of the layers. How is the total thermal resistance of the composite system calculated?
- Published on 11 Aug 15

a. 1 / (R1 + R2 + R3)
b. ( (1 / R1) + (1 / R2) + (1 / R3) )
c. (R1 + R2 + R3)
d. none of the above

ANSWER: (R1 + R2 + R3)

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