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Comparative Thermodynamic Analysis of Kalina and Kalina Flash Cycles for Utilizing Low-Grade Heat Sources

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  • Kyoung Hoon Kim

    (Department of Mechanical Engineering, Kumoh National Institute of Technology, Gyeongbuk 39177, Korea)

  • Chul Ho Han

    (Department of Mechanical System Engineering, Kumoh National Institute of Technology, Gyeongbuk 39177, Korea)

  • Hyung Jong Ko

    (Department of Mechanical Engineering, Kumoh National Institute of Technology, Gyeongbuk 39177, Korea)

Abstract

The Kalina flash cycle (KFC) is a novel, recently proposed modification of the Kalina cycle (KC) equipped with a flash vessel. This study performs a comparative analysis of the thermodynamic performance of KC and KFC utilizing low-grade heat sources. How separator pressure, flash pressure, and ammonia mass fraction affect the system performance is systematically and parametrically investigated. Dependences of net power and cycle efficiencies on these parameters as well as the mass flow rate, heat transfer rate and power production at the cycle components are analyzed. For a given set of separator pressure and ammonia mass fraction, there exists an optimum flash pressure making exergy efficiency locally maximal. For these pressures, which are higher for higher separator pressure and lower ammonia mass fraction, KFC shows better performance than KC both in net power and cycle efficiencies. At higher ammonia mass fraction, however, the difference is smaller. While the maximum power production increases with separator pressure, the dependence is quite weak for the maximum values of both efficiencies.

Suggested Citation

  • Kyoung Hoon Kim & Chul Ho Han & Hyung Jong Ko, 2018. "Comparative Thermodynamic Analysis of Kalina and Kalina Flash Cycles for Utilizing Low-Grade Heat Sources," Energies, MDPI, vol. 11(12), pages 1-14, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:12:p:3311-:d:185934
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    References listed on IDEAS

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    Cited by:

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    3. Kyoung Hoon Kim, 2019. "Thermodynamic Performance and Optimization Analysis of a Modified Organic Flash Cycle for the Recovery of Low-Grade Heat," Energies, MDPI, vol. 12(3), pages 1-21, January.

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