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Performance mapping of the R744 ejectors for refrigeration and air conditioning supermarket application: A hybrid reduced-order model

Author

Listed:
  • Haida, Michal
  • Smolka, Jacek
  • Hafner, Armin
  • Ostrowski, Ziemowit
  • Palacz, Michał
  • Madsen, Kenneth B.
  • Försterling, Sven
  • Nowak, Andrzej J.
  • Banasiak, Krzysztof

Abstract

The continuous derivation of the ambient temperature and cooling demand in CO2 refrigeration and air-conditioning systems equipped with multi-ejector modules for supermarkets requires the analysis of the fixed ejector utilisation in a very wide range of the operational envelope. Therefore, performance mapping of the four R744 ejectors installed in the multi-ejector pack was performed. The investigations of a single ejector's work were performed based on the proposed hybrid reduced-order model to predict the performance of each ejector under arbitrary operating conditions. The proposed model was validated and generated by use of the experimental data together with the computational fluid dynamic model results. The ejector efficiency mapping indicated the area of the best ejector performance in the range from approximately 50 bar–100 bar. The mass entrainment ratio of all four ejectors was presented for different ambient temperatures and the pressure lift. An area of the mass entrainment ratio greater than 0.3 was obtained by each ejector at ambient temperature above approximately 15 °C for pressure lift below 10 bar. The approximation functions of the ejector pressure lift in terms of the ambient temperature for air-conditioning operating conditions to reach the best efficiency of each ejector are proposed.

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  • 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.
    • Handle: RePEc:eee:energy:v:153:y:2018:i:c:p:933-948
    DOI: 10.1016/j.energy.2018.04.088
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    References listed on IDEAS

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    Cited by:

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    2. Michal Haida & Rafal Fingas & Wojciech Szwajnoch & Jacek Smolka & Michal Palacz & Jakub Bodys & Andrzej J. Nowak, 2019. "An Object-Oriented R744 Two-Phase Ejector Reduced-Order Model for Dynamic Simulations," Energies, MDPI, vol. 12(7), pages 1-24, April.
    3. Palacz, Michal & Haida, Michal & Smolka, Jacek & Plis, Marcin & Nowak, Andrzej J. & Banasiak, Krzysztof, 2018. "A gas ejector for CO2 supercritical cycles," Energy, Elsevier, vol. 163(C), pages 1207-1216.
    4. Ángel Á. Pardiñas & Michael Jokiel & Christian Schlemminger & Håkon Selvnes & Armin Hafner, 2021. "Modeling of a CO 2 -Based Integrated Refrigeration System for Supermarkets," Energies, MDPI, vol. 14(21), pages 1-21, October.
    5. Anas F A Elbarghthi & Saleh Mohamed & Van Vu Nguyen & Vaclav Dvorak, 2020. "CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf)," Energies, MDPI, vol. 13(6), pages 1-19, March.
    6. Lixing Zheng & Hongwei Hu & Weibo Wang & Yiyan Zhang & Lingmei Wang, 2022. "Study on Flow Distribution and Structure Optimization in a Mix Chamber and Diffuser of a CO 2 Two-Phase Ejector," Mathematics, MDPI, vol. 10(5), pages 1-16, February.
    7. 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.
    8. Artur Bieniek & Jan Kuchmacz & Karol Sztekler & Lukasz Mika & Ewelina Radomska, 2021. "A New Method of Regulating the Cooling Capacity of a Cooling System with CO 2," Energies, MDPI, vol. 14(7), pages 1-18, March.
    9. Knut Emil Ringstad & Krzysztof Banasiak & Åsmund Ervik & Armin Hafner, 2022. "Swirl-Bypass Nozzle for CO 2 Two-Phase Ejectors: Numerical Design Exploration," Energies, MDPI, vol. 15(18), pages 1-30, September.

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