What should be the minimum value of LMTD Correction Factor F for steady state operation of the equipment?

What should be the minimum value of LMTD Correction Factor F for steady state operation of the equipment? Correct Answer 1 > F > 0.75

The value of corrected LMTD should be less than the theoretical LMTD considering countercurrent flow. Thus the LMTD correction factor is less than 1. Also for steady state operation of the HE, its value should be more than 0.75.
Bissoy MCQ

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