Heat Transfer

Q.

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface)

A. `U_1 - U_2`
B. `1/U_1 - 1/U_2`
C. `1/U_2 - 1/U_1`
D. `U_2 - U_1`

Answer : Option B

Explanation :