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

Double pipe heat exchanger
Counter flow of hot and cold fluids
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

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

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