Research Papers: Heat Exchangers

Second Law Analysis of Heat Exchangers

[+] Author and Article Information
Ahmad Fakheri

 Bradley University, Peoria, IL 61625ahmad@bradley.edu

J. Heat Transfer 132(11), 111802 (Aug 13, 2010) (7 pages) doi:10.1115/1.4002097 History: Received February 07, 2010; Revised June 13, 2010; Published August 13, 2010; Online August 13, 2010

This paper further explores the topic of an ideal heat exchanger, which is still an open question. It is shown that the minimization of entropy production or exergy destruction should not be an objective in heat exchanger design. It is further proven that heat exchanger effectiveness does not correlate with irreversibility. A new performance measure, entropy flux, is introduced and a general expression for its evaluation is presented. It is shown that entropy flux captures many desirable attributes of heat exchangers. For a given effectiveness, a single stream heat exchanger has the absolute maximum entropy flux, and for capacity ratios greater than zero, counterflow has the highest entropy flux, parallel flow the lowest, and the shell and tube heat exchangers are somewhere in between.

Copyright © 2010 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 4

Heat exchangers in series

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Figure 1

Entropy, effectiveness, and Ns change with capacity

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Figure 2

Comparison of exact and approximate solution

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Figure 3

Scaled entropy flux




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