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

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

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Process Equipment and Plant Design
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Can accomodate less number of tubes for a given shell diameter
Results in higher shell side pressure drop
Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid
Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient

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