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Question

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)


Options:
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


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