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Exergy Flows inside a One Phase Ejector for Refrigeration Systems

Author

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  • Mohammed Khennich

    (Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada)

  • Mikhail Sorin

    (Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada)

  • Nicolas Galanis

    (Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada)

Abstract

The evaluation of the thermodynamic performance of the mutual transformation of different kinds of exergy linked to the intensive thermodynamic parameters of the flow inside the ejector of a refrigeration system is undertaken. Two thermodynamic metrics, exergy produced and exergy consumed, are introduced to assess these transformations. Their calculation is based on the evaluation of the transiting exergy within different ejector sections taking into account the temperature, pressure and velocity variations. The analysis based on these metrics has allowed pinpointing the most important factors affecting the ejector’s performance. A new result, namely the temperature rise in the sub-environmental region of the mixing section is detected as an important factor responsible for the ejector’s thermodynamic irreversibility. The overall exergy efficiency of the ejector as well as the efficiencies of its sections are evaluated based on the proposed thermodynamic metrics.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:3:p:212-:d:65979
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    References listed on IDEAS

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    1. Zanchini, Enzo, 2015. "A more general exergy function and its application to the definition of exergy efficiency," Energy, Elsevier, vol. 87(C), pages 352-360.
    2. Chen, Xiangjie & Omer, Siddig & Worall, Mark & Riffat, Saffa, 2013. "Recent developments in ejector refrigeration technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 19(C), pages 629-651.
    3. Khennich, Mohammed & Galanis, Nicolas & Sorin, Mikhail, 2016. "Effects of design conditions and irreversibilities on the dimensions of ejectors in refrigeration systems," Applied Energy, Elsevier, vol. 179(C), pages 1020-1031.
    4. Lazzaretto, Andrea & Tsatsaronis, George, 2006. "SPECO: A systematic and general methodology for calculating efficiencies and costs in thermal systems," Energy, Elsevier, vol. 31(8), pages 1257-1289.
    5. Marmolejo-Correa, Danahe & Gundersen, Truls, 2012. "A comparison of exergy efficiency definitions with focus on low temperature processes," Energy, Elsevier, vol. 44(1), pages 477-489.
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    Cited by:

    1. 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.
    2. Haghparast, Payam & Sorin, Mikhail V. & Nesreddine, Hakim, 2018. "The impact of internal ejector working characteristics and geometry on the performance of a refrigeration cycle," Energy, Elsevier, vol. 162(C), pages 728-743.
    3. Fenglei Li & Zhao Chang & Qi Tian & Changzhi Wu & Xiangyu Wang, 2017. "Performance Predictions of Dry and Wet Vapors Ejectors Over Entire Operational Range," Energies, MDPI, vol. 10(7), pages 1-26, July.

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