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
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

Entropy, effectiveness, and Ns change with capacity

Grahic Jump Location
Figure 2

Comparison of exact and approximate solution

Grahic Jump Location
Figure 3

Scaled entropy flux

Grahic Jump Location
Figure 4

Heat exchangers in series




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In