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TECHNICAL PAPERS: Heat Exchangers

Integrative Thermodynamic Optimization of the Crossflow Heat Exchanger for an Aircraft Environmental Control System

[+] Author and Article Information
Jose V. C. Vargas, Adrian Bejan

Department of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, NC 27708-0300

David L. Siems

The Boeing Company, MC S106-7075, PO Box 516, Saint Louis, MO 63166-0519

J. Heat Transfer 123(4), 760-769 (Jan 20, 2001) (10 pages) doi:10.1115/1.1375811 History: Received June 09, 2000; Revised January 20, 2001
Copyright © 2001 by ASME
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References

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Figures

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Environmental control system with compression and expansion on the engine-air side (ṁe), and heat exchanger for cooling with ram air (ṁa)
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The T-s diagrams of the processes undergone by the engine-air and ram-air streams
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The geometry of a crossflow heat exchanger core with parallel-plate channels
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The minimization of entropy generation rate with respect to the ratio of channel spacings (Be/Ba), and the effect of varying P̃1,Ãcd, and M
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The minimization of entropy generation rate with respect to the ratio of channel spacings (Be/Ba) when the aspect ratios of the heat exchanger core are fixed (Ly/Lx,Lz/Lx)
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The minimization of entropy generation rate with respect to the heat exchanger aspect ratio Ly/Lx
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The minimization of entropy generation rate with respect to the heat exchanger aspect ratio Lz/Lx
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Summary of results at the end of the minimization of NS1 with respect to two of the three degrees of freedom, Be/Ba and Ly/Lx
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The effect of P̃1 on the minimization of NS1 with respect to all three degrees of freedom, Be/Ba,Ly/Lx, and Lz/Lx
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The effect of Ãcd on the minimization of NS1 with respect to all three degrees of freedom, Be/Ba,Ly/Lx and Lz/Lx
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The effect of M on the minimization of NS1 with respect to all three degrees of freedom, Be/Ba,Ly/Lx, and Lz/Lx
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The effect of ϕ on the minimization of NS1 with respect to all three degrees of freedom, Be/Ba,Ly/Lx, and Lz/Lx
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The effect of the total volume on the minimization of NS1 with respect to all three degrees of freedom, Be/Ba,Ly/Lx, and Lz/Lx
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The two geometries compared in Table 2: the traditional design versus the thermodynamically optimal geometry described in this paper.

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