Total thermal resistance of composite cylinder - Heat Transfer

Q.  For the composite cylinder as shown in figure, the thermal resistances of every layer from inside to outside of the cylinder are given as follows,
R1 =  ln (r1 / ri) / 2πk1l
R1 =  ln (ro / r1) / 2πk2l
What will be the total thermal resistance of the composite cylinder?

- Published on 12 Aug 15

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

ANSWER: R = R1 + R2

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