Relation Between the Thermal Effectiveness of Overall Parallel and Counterflow Heat Exchanger Geometries

[+] Author and Article Information
A. Pignotti

TECHINT S.A., 1001 Buenos Aires, Argentina

J. Heat Transfer 111(2), 294-299 (May 01, 1989) (6 pages) doi:10.1115/1.3250677 History: Received September 14, 1987; Online October 20, 2009


A simple relation is established between the thermal effectiveness of two heat exchanger configurations that differ from each other in the inversion of either one of the two fluids. Using this relation, if the expression for the effectiveness of a configuration, as a function of the heat capacity rate ratio, and the number of heat transfer units, is known, the corresponding expression for the “inverse” configuration is immediately obtained. The relation is valid under the assumptions of temperature independence of the heat transfer coefficient and heat capacity rates, when one of the fluids proceeds through the exchanger in a single, mixed stream. The property is illustrated with several examples from the available literature.

Copyright © 1989 by ASME
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