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TECHNICAL PAPERS

Internal Entropy Generation Limits for Direct Sensible Thermal Storage

[+] Author and Article Information
K. O. Homan

Department of Mechanical and Aerospace Engineering and Engineering Mechanics, University of Missouri-Rolla, Rolla, Missouri 65409-0050 e-mail: khoman@umr.edu

J. Energy Resour. Technol 125(2), 85-93 (Jun 04, 2003) (9 pages) doi:10.1115/1.1576266 History: Received February 01, 2001; Revised November 01, 2002; Online June 04, 2003
Copyright © 2003 by ASME
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References

Figures

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Simplified schematic of a direct sensible storage vessel.
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Entropy generation rate, σ̇f(t), for the fully-mixed limit
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Total entropy generation, σf(t), for the fully-mixed limit
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Profiles of local entropy generation rate, σ̇s overlayed with vertical temperature profiles for the ideally-stratified limit with (a) Pe=103 and (b) Pe=105 for τ=0.075
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Time and Peclet number dependence of integral terms in the entropy generation rate, Eq. (21), of the ideally-stratified limit
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Entropy generation rate in time for the fully-mixed limit, σ̇f, and the ideally-stratified limit, σ̇s, based on the local entropy generation rate computed from (a) the full solution as given in Eq. (4) and (b) the leading term of the expansion based on the approximate solution given in Eq. (5). In all cases, τ=0.075.
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The time and Peclet number dependence of the G1 integral, Eq. (26a), in the total entropy generation of the ideally-stratified limit
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Time and Peclet number dependence of the integral terms, Eq. (26a) and (26b), in the result for the total entropy generation of the ideally-stratified limit
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Entropy generation number, as defined by Eq. (30), for the ideally-stratified limit
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Profiles of local entropy generation rate, σ̇m overlayed with vertical temperature profiles for the mixing-height model with (a) Pe=103 and (b) Pe=105 for ym=0.05 and τ=0.075
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Total entropy generation for the mixing height model with σm,t computed from the integral balance, Eq. (11), and σm,α computed from the local rate, Eq. (15), for (a) Pe=103 and (b) Pe=105 with τ=0.075
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Entropy generation number for the mixing-height model at several typical mixing heights with τ=0.075

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