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Numerical investigation of heat transfer in a CO2 two-phase ejector

Author

Listed:
  • Haida, Michal
  • Smolka, Jacek
  • Hafner, Armin
  • Mastrowski, Mikolaj
  • Palacz, Michał
  • Madsen, Kenneth B.
  • Nowak, Andrzej J.
  • Banasiak, Krzysztof

Abstract

In this paper, the influence of heat transfer in the walls of an R744 two-phase ejector on ejector performance was investigated. A numerical investigation was performed using a computational fluid dynamic (CFD) model of the R744 two-phase flow coupled with the heat transfer inside the ejector. An ejector equipped with thermocouple channels was designed and manufactured to investigate temperature distribution in the inner walls under boundary conditions typical for a refrigeration and air-conditioning application in a supermarket. The ejector was installed on the test rig to perform a test series that evaluated the outer walls of the ejector with and without insulation. The experimental results were used to validate the proposed CFD model, and a numerical investigation was performed to analyse the influence of heat transfer on ejector performance. The motive nozzle and suction nozzle mass flow rates accuracies were within ±7% and ±15%, respectively. In addition, the proposed CFD model predicted the wall temperatures with ±5 K accuracy for most of the validated points. The heat transfer coefficient of the R744 two-phase flow inside the ejector is presented. The non-adiabatic inner walls degraded ejector performance. The maximum reduction of the mass entrainment ratio reached approximately 13%.

Suggested Citation

  • Haida, Michal & Smolka, Jacek & Hafner, Armin & Mastrowski, Mikolaj & Palacz, Michał & Madsen, Kenneth B. & Nowak, Andrzej J. & Banasiak, Krzysztof, 2018. "Numerical investigation of heat transfer in a CO2 two-phase ejector," Energy, Elsevier, vol. 163(C), pages 682-698.
    • Handle: RePEc:eee:energy:v:163:y:2018:i:c:p:682-698
    DOI: 10.1016/j.energy.2018.08.175
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    References listed on IDEAS

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    1. Besagni, Giorgio & Mereu, Riccardo & Inzoli, Fabio, 2016. "Ejector refrigeration: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 373-407.
    2. Haida, Michal & Smolka, Jacek & Hafner, Armin & Ostrowski, Ziemowit & Palacz, Michał & Madsen, Kenneth B. & Försterling, Sven & Nowak, Andrzej J. & Banasiak, Krzysztof, 2018. "Performance mapping of the R744 ejectors for refrigeration and air conditioning supermarket application: A hybrid reduced-order model," Energy, Elsevier, vol. 153(C), pages 933-948.
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    Cited by:

    1. Mastrowski, Mikolaj & Smolka, Jacek & Hafner, Armin & Haida, Michal & Palacz, Michal & Banasiak, Krzysztof, 2019. "Experimental study of the heat transfer problem in expansion devices in CO2 refrigeration systems," Energy, Elsevier, vol. 173(C), pages 586-597.
    2. Li, Yafei & Deng, Jianqiang, 2022. "Numerical investigation on the performance of transcritical CO2 two-phase ejector with a novel non-equilibrium CFD model," Energy, Elsevier, vol. 238(PC).
    3. Lin, Zi & Liu, Xiaolei & Lao, Liyun & Liu, Hengxu, 2020. "Prediction of two-phase flow patterns in upward inclined pipes via deep learning," Energy, Elsevier, vol. 210(C).
    4. 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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