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Analysis and Optimization of Exergy Flows inside a Transcritical CO 2 Ejector for Refrigeration, Air Conditioning and Heat Pump Cycles

Author

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  • Sahar Taslimi Taleghani

    (Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC J1K2R1, Canada)

  • Mikhail Sorin

    (Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC J1K2R1, Canada)

  • Sébastien Poncet

    (Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC J1K2R1, Canada)

Abstract

In this study, the exergy analysis of a CO 2 (R744) two-phase ejector was performed using a 1D model for both single and double choking conditions. The impact of the back pressure on the exergy destruction and exergy efficiencies was presented to evaluate the exergy performance under different working conditions. The results of two exergy performance criteria (transiting exergy efficiency and Grassmann exergy efficiency) were compared for three modes of an ejector functioning: Double choking, single choking and at the critical point. The behavior of three thermodynamic metrics: Exergy produced, exergy consumed and exergy destruction were evaluated. An important result concerning the ejector’s design was the presence of a maximum value of transiting exergy efficiency around the critical point. The impact of the gas cooler and evaporator pressure variations on the different types of exergy, the irreversibilities and the ejector global performance were investigated for a transcritical CO 2 ejector system. It was also shown that the transiting exergy flow had an important effect on the exergy analysis of the system and the Grassmann exergy efficiency was not an appropriate criterion to evaluate a transcritical CO 2 ejector performance.

Suggested Citation

  • Sahar Taslimi Taleghani & Mikhail Sorin & Sébastien Poncet, 2019. "Analysis and Optimization of Exergy Flows inside a Transcritical CO 2 Ejector for Refrigeration, Air Conditioning and Heat Pump Cycles," Energies, MDPI, vol. 12(9), pages 1-15, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1686-:d:228222
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    References listed on IDEAS

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    1. Sarkar, Jahar, 2008. "Optimization of ejector-expansion transcritical CO2 heat pump cycle," Energy, Elsevier, vol. 33(9), pages 1399-1406.
    2. Austin, Brian T. & Sumathy, K., 2011. "Transcritical carbon dioxide heat pump systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 4013-4029.
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    4. Paride Gullo & Armin Hafner & Krzysztof Banasiak, 2019. "Thermodynamic Performance Investigation of Commercial R744 Booster Refrigeration Plants Based on Advanced Exergy Analysis," Energies, MDPI, vol. 12(3), pages 1-24, January.
    5. Mohammed Khennich & Mikhail Sorin & Nicolas Galanis, 2016. "Exergy Flows inside a One Phase Ejector for Refrigeration Systems," Energies, MDPI, vol. 9(3), pages 1-10, March.
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    Cited by:

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    2. Abbas Aghagoli & Mikhail Sorin & Mohammed Khennich, 2022. "Exergy Efficiency and COP Improvement of a CO 2 Transcritical Heat Pump System by Replacing an Expansion Valve with a Tesla Turbine," Energies, MDPI, vol. 15(14), pages 1-16, July.
    3. Zhang, Jingzhi & Zhai, Xiaoyu & Li, Shizhen, 2020. "Numerical studies on the performance of ammonia ejectors used in ocean thermal energy conversion system," Renewable Energy, Elsevier, vol. 161(C), pages 766-776.
    4. Marco Gambini & Michele Manno & Michela Vellini, 2024. "Energy and Exergy Analysis of Transcritical CO 2 Cycles for Heat Pump Applications," Sustainability, MDPI, vol. 16(17), pages 1-26, August.
    5. Shizhen Li & Wei Li & Yanjun Liu & Chen Ji & Jingzhi Zhang, 2020. "Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures," Energies, MDPI, vol. 13(5), pages 1-17, March.

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