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RESEARCH PAPERS

Effectiveness of Series Assemblies of Divided-Flow Heat Exchangers

[+] Author and Article Information
A. Pignotti

TECHINT S.A., Buenos Aires, Argentina

J. Heat Transfer 108(1), 141-146 (Feb 01, 1986) (6 pages) doi:10.1115/1.3246878 History: Received October 11, 1984; Online October 20, 2009

Abstract

Formulas are derived for the effectiveness of a series assembly of two divided-flow exchangers, as a function of the heat capacity rate ratio, and the partial effectivenesses of the components. Six possible connections are discussed: overall parallel flow and counterflow, with either mixing of the intermediate divided streams, or direct or crossed coupling of the same. It is shown that when both exchangers are alike, and direct coupling is used, the simplifying mixing assumption leads to a systematic overestimate of the effectiveness of the assembly. The size of this effect is discussed and illustrated with explicit solutions for TEMA J exchangers with one and two tube passes.

Copyright © 1986 by ASME
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