Formula for total thermal resistance of a heat exchanger - Heat Transfer

Q.  How can the total thermal resistance of a heat exchanger, in which two fluids are separated by a plane wall of surface area A, thickness t and thermal conductivity k, be calculated?
h1 and h2 are the convection heat transfer coefficients on each side of wall.
- Published on 12 Aug 15

a. (t / h1 A) + (t / h2 A)
b. (1 / h1 A) + (1 / h2 A)
c. (1 / h1 A) + (1 / h2 A) + (1 / k A)
d. (1 / h1 A) + (1 / h2 A) + (t / k A)

ANSWER: (1 / h1 A) + (1 / h2 A) + (t / k A)

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