Customarily, the log mean temperature difference (LMTD) correction
factor, FT, is used to screen alternative heat
exchanger designs. Designs with unacceptably low
FT values are discarded. A more fundamental
criterion, based on temperature cross, is proposed to design
multipass exchangers. Modified FT-R-S charts
incorporate the effect of temperature cross on FT
using a dimensionless parameter, G. The charts emphasize the
need to use the temperature cross as a design criterion. A simple
equation in terms of G is presented to estimate number of
shells. An innovative graphic procedure based on this equation is
also described.
FT correction factors. In the simplest
shell-and-tub
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