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The impact of internal ejector working characteristics and geometry on the performance of a refrigeration cycle

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  • Haghparast, Payam
  • Sorin, Mikhail V.
  • Nesreddine, Hakim

Abstract

Improvement of the refrigeration cycle performance and the proper design of ejectors for compression energy recovery require a detailed analysis on the internal ejector working characteristics and geometry. To this aim, an experimental and numerical investigation of an ejector refrigeration system (ERS) is conducted to determine the effect of the most important ejector dimensions and main operating conditions on ejector working characteristics and cycle performance. Experimental results show that the best performance of the ejector and consequently the refrigeration cycle were achieved for the maximum pressure ratio at the critical condenser temperature point. At this condition, ejector internal exergy losses are minimal according to the carried out numerical studies. Furthermore, it has been found that the primary nozzle diameter is the most influential factor for ejector performance and pressure ratio improvement. Results show that an increase in the primary diameter leads to the double improvement of the overall ejector efficiency. In addition, it has been found that most of the exergy losses inside the ejector are located in three regions, respectively: the constant area mixing section, the mixing chamber and the primary nozzle.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:162:y:2018:i:c:p:728-743
    DOI: 10.1016/j.energy.2018.08.017
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    References listed on IDEAS

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    Cited by:

    1. Braimakis, Konstantinos, 2021. "Solar ejector cooling systems: A review," Renewable Energy, Elsevier, vol. 164(C), pages 566-602.
    2. Han, Yu & Wang, Xiaodong & Sun, Hao & Zhang, Guangli & Guo, Lixin & Tu, Jiyuan, 2019. "CFD simulation on the boundary layer separation in the steam ejector and its influence on the pumping performance," Energy, Elsevier, vol. 167(C), pages 469-483.
    3. Taleghani, S. Taslimi & Sorin, M. & Gaboury, S., 2021. "Thermo-economic analysis of heat-driven ejector system for cooling smelting process exhaust gas," Energy, Elsevier, vol. 220(C).
    4. 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.
    5. Sun, Fangtian & Chen, Xu & Fu, Lin & Zhang, Shigang, 2018. "Configuration optimization of an enhanced ejector heat exchanger based on an ejector refrigerator and a plate heat exchanger," Energy, Elsevier, vol. 164(C), pages 408-417.
    6. Besagni, Giorgio, 2019. "Ejectors on the cutting edge: The past, the present and the perspective," Energy, Elsevier, vol. 170(C), pages 998-1003.

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