July 2001

Special Report: Heat Transfer

Temperature cross-based criterion for multipass heat exchanger design

A simple equation and graphic procedure give better results

Gulyani, B. B., Jain, A., Department of Chemical Engineering

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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