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Converting Low-Grade Heat Into Power Using a Supercritical Rankine Cycle With Zeotropic Mixture Working Fluid

[+] Author Affiliations
Huijuan Chen, D. Yogi Goswami, Muhammad M. Rahman, Elias K. Stefanakos

University of South Florida, Tampa, FL

Paper No. ES2010-90089, pp. 469-478; 10 pages
doi:10.1115/ES2010-90089
From:
  • ASME 2010 4th International Conference on Energy Sustainability
  • ASME 2010 4th International Conference on Energy Sustainability, Volume 1
  • Phoenix, Arizona, USA, May 17–22, 2010
  • Conference Sponsors: Advanced Energy Systems Division and Solar Energy Division
  • ISBN: 978-0-7918-4394-9 | eISBN: 978-0-7918-3871-6
  • Copyright © 2010 by ASME

abstract

A supercritical Rankine cycle using zeotropic mixture working fluids for the conversion of low-grade heat into power is proposed and analyzed in this paper. A supercritical Rankine cycle does not go through two-phase region during the heating process. By adopting zeotropic mixtures as the working fluids, the condensation process happens non-isothermally. Both of the features create a potential in reducing the irreversibility and improving the system efficiency. A comparative study between an organic Rankine cycle and the proposed supercritical Rankine cycle shows that the proposed cycle improves the cycle thermal efficiency, exergy efficiency of the heating and the condensation processes, and the system overall efficiency.

Copyright © 2010 by ASME

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