Design of Multipass Heat Exchangers: An Alternative Approach

[+] Author and Article Information
S. Ahmad, B. Linnhoff, R. Smith

Department of Chemical Engineering, UMIST, Manchester, England

J. Heat Transfer 110(2), 304-309 (May 01, 1988) (6 pages) doi:10.1115/1.3250484 History: Received February 23, 1987; Online October 20, 2009


Multipass heat exchangers are often designed according to the rule of thumb FT ≤ 0.75. This criterion can give rise to poor designs. It is the slope (∂FT /∂P)R that is important, not just the absolute value of FT . Furthermore, in multishell arrangements, the number of shells required is usually evaluated by trial and error. This paper introduces an approach based on a new parameter that is an alternative to FT factors. The method is fully compatible with established design practice, takes account of the FT slope, and evaluates the number of shells explicitly in multishell cases.

Copyright © 1988 by ASME
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