The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is _____________________?
Correct answer: B. 333 W/m2.K
- A. 1200 W/m2.K
- B. 333 W/m2.K
- C. 894 W/m2.K
- D. 287 W/m2.K
Explanation
Add the fouling resistance to the clean exchanger resistance: 1/U = 1/400 + 1/2000 = 0.003 m²·K/W. Thus U is approximately 333 W/m²·K, showing why fouling lowers the overall coefficient.
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