Process Equipment and Plant Design
LMTD correction factor is used in heat exchanger design for

Counter flow of hot and cold fluids
Double pipe heat exchanger
Fouling fluids
Multipass shell and tube heat exchanger

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Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Geometric mean of the true temperature difference and the LMTD
Differenced of true temperature difference and the LMTD
Ratio of true temperature difference to the LMTD
Ratio of LMTD to the true temperature difference

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Overall gas transfer units to the number of ideal trays required
Ideal trays required to the number of real trays required
None of these
Real trays required to the number of ideal trays required

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