Formula for rate of heat flow through wall - Heat Transfer

Q.  What will be the simple correct formula for the rate of heat flow (q) through a wall of surface area A and thickness of t ?
The two surfaces of the wall are at temperatures T1 and T2 (T1>T2). Consider thermal resistance for the heat transfer system as Rh.

- Published on 11 Aug 15

a. q = Rh (T1 – T2)
b. q = Rh A (T1 – T2)
c. q = (T1 – T2) / Rh
d. q = Rh A ((T1 – T2) / t)

ANSWER: q = (T1 – T2) / Rh

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