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Thermodynamic optimization of the match between two streams with phase change

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  • Vargas, J.V.C.
  • Bejan, A.

Abstract

The optimum thermodynamic match between two streams at different temperatures is determined by maximizing the power generation (or minimizing the entropy generation) associated solely with the stream-to-stream interaction. Each stream experiences a change of phase. It is shown that the optimum is marked by an optimal ratio between the stream mass flow rates, and an optimal ratio between the two heat exchanger sizes when the total heat transfer area is fixed. The sensitivity of the optimum relative to the various physical parameters of the two-stream arrangement is documented systematically. The study shows that the optimum is “robust” relative to changes in several parameters such as the distribution of heat transfer coefficient along the hot-end heat exchanger, and the model used for the thermodynamic behavior of steam.

Suggested Citation

  • Vargas, J.V.C. & Bejan, A., 2000. "Thermodynamic optimization of the match between two streams with phase change," Energy, Elsevier, vol. 25(1), pages 15-33.
    • Handle: RePEc:eee:energy:v:25:y:2000:i:1:p:15-33
    DOI: 10.1016/S0360-5442(99)00052-3
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    References listed on IDEAS

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    1. Moran, M.J, 1998. "On second-law analysis and the failed promise of finite-time thermodynamics," Energy, Elsevier, vol. 23(6), pages 517-519.
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    Cited by:

    1. Manjunath, K. & Kaushik, S.C., 2014. "Second law thermodynamic study of heat exchangers: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 40(C), pages 348-374.
    2. Ho, Tony & Mao, Samuel S. & Greif, Ralph, 2012. "Comparison of the Organic Flash Cycle (OFC) to other advanced vapor cycles for intermediate and high temperature waste heat reclamation and solar thermal energy," Energy, Elsevier, vol. 42(1), pages 213-223.
    3. Revellin, Rémi & Lips, Stéphane & Khandekar, Sameer & Bonjour, Jocelyn, 2009. "Local entropy generation for saturated two-phase flow," Energy, Elsevier, vol. 34(9), pages 1113-1121.
    4. Kovac Kralj, Anita, 2015. "Recovering energy from flue gas by using a utilities grid technique," Energy, Elsevier, vol. 86(C), pages 85-92.
    5. Zebian, Hussam & Mitsos, Alexander, 2012. "A double-pinch criterion for regenerative Rankine cycles," Energy, Elsevier, vol. 40(1), pages 258-270.
    6. Wang, Chaoyang & Liu, Ming & Zhao, Yongliang & Yan, Junjie, 2021. "Thermodynamic optimization of the superheater during switching the load transient processes," Energy, Elsevier, vol. 218(C).
    7. Kralj, Anita Kovač, 2011. "Estimation of maximum steam pressure by a mathematical linear technique," Energy, Elsevier, vol. 36(5), pages 2434-2439.
    8. Ho, Tony & Mao, Samuel S. & Greif, Ralph, 2012. "Increased power production through enhancements to the Organic Flash Cycle (OFC)," Energy, Elsevier, vol. 45(1), pages 686-695.
    9. Wang, Yi-Hsien & Yang, Yue-Tzu, 2011. "Three-dimensional transient cooling simulations of a portable electronic device using PCM (phase change materials) in multi-fin heat sink," Energy, Elsevier, vol. 36(8), pages 5214-5224.

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