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The overall heat transfer coefficient for a shell and tube heat exchanger for clean surfaces is Uo = 400 W/m2- K. The fouling factor after one year of operation is found to be hfo = 200 W/m2 -K. The overall heat transfer coefficient at this time is
  • a)
    1200 W/m2 - K
  • b)
    894 W/m2 - K
  • c)
    33 W/m2 - K
  • d)
    287 W/m2 - K
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The overall heat transfer coefficient for a shell and tube heat excha...
Given Uo = 400 W/m2- K
Fouling factor, hFO = 200 W/m2-K
∴ New overall heat transfer coefficient can be predicted as follows
1/U = 1/U+1/hFO
1/U = 1/400 + 1/200
U = 33.33 W/m2-K
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Most Upvoted Answer
The overall heat transfer coefficient for a shell and tube heat excha...
Solution:

Given data:
Overall heat transfer coefficient for clean surfaces Uo = 400 W/m2-K
Fouling factor after one year of operation hfo = 200 W/m2-K

The overall heat transfer coefficient with fouling is given by:
1/U = 1/Uo + hfi
where hfi is the fouling factor after i years of operation.

After one year of operation, the overall heat transfer coefficient is:
1/U = 1/400 + 200
1/U = 0.005
U = 200 W/m2-K

Therefore, the overall heat transfer coefficient after one year of operation is 33 W/m2-K (as given in option C).

Answer: C) 33 W/m2-K
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The overall heat transfer coefficient for a shell and tube heat exchanger for clean surfaces is Uo = 400 W/m2- K. The fouling factor after one year of operation is found to be hfo = 200 W/m2 -K. The overall heat transfer coefficient at this time isa) 1200 W/m2 - Kb) 894 W/m2 - Kc) 33 W/m2 - Kd) 287 W/m2 - KCorrect answer is option 'C'. Can you explain this answer?
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