Fouling factor for a heat exchanger is given by (where, U₁ = heat t – McqOptions

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1.	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.	U₁ - U₂
B.	1/U₁ - 1/U₂
C.	1/U₂ - 1/U₁
D.	U₂ - U₁
Answer» C. 1/U₂ - 1/U₁

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