Overall heat transfer co-efficient of a particular tube is U1 If...

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Overall heat transfer co-efficient of a particular tube is U₁. If the same tube with some dirt deposited on either side has coefficient U₂, then

A. U₁ = U₂

B. U₂ > U₁

C. U₁ > U₂

D. U₁ = dirt factor - U₂

Answer: Option A

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