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) ?
Correct answer: B. 1/U1 - 1/U2
- A. U1 - U2
- B. 1/U1 - 1/U2
- C. 1/U2 - 1/U1
- D. U2 - U1
Explanation
The fouling resistance is the added thermal resistance caused by deposits, so 1/U_dirty = 1/U_clean + R_f. Therefore, R_f = 1/U1 − 1/U2 when U1 is for the dirty exchanger and U2 for the clean exchanger.
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