It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?
Correct answer: B. < 0.75
- A. > 0.75
- B. < 0.75
- C. < 0.50
- D. < 0.25
Explanation
The LMTD correction factor accounts for departure from ideal countercurrent flow; a value below about 0.75 indicates an inefficient exchanger arrangement and poor temperature driving force. Such a 1-2 exchanger is therefore generally avoided for that duty.
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