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System model derivation of the CO2 two-phase ejector based on the CFD-based reduced-order model

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  • Haida, Michal
  • Smolka, Jacek
  • Hafner, Armin
  • Ostrowski, Ziemowit
  • Palacz, Michal
  • Nowak, Andrzej J.
  • Banasiak, Krzysztof

Abstract

The developed reduced-order model (ROM) of the R744 two-phase ejector was presented in this paper. The proper orthogonal decomposition (POD) model was employed together with the radial basis function (RBF) to evaluate the ejector performance at the motive nozzle operating regime from 70 bar to 100 bar. The proposed model was built based on the full CFD model of the R744 two-phase ejector with homogeneous equilibrium flow assumption. The validation procedure was performed to evaluate the ejector nozzles mass flow rate discrepancies of ROM compared to the CFD results and experimental data. In addition, the accuracy analysis of the ROM flow field results compared to the CFD results was performed. The validation process based on the CFD results and experimental data indicated the high accuracy of ROM for both nozzles mass flow rate within ±10% for most of the investigated operating points. Hence, the high accuracy of the computed mass flow rates allows ROM implementation into the dynamic simulations of the refrigeration system to evaluate the ejector performance at given operating points with negligible time effort.

Suggested Citation

  • Haida, Michal & Smolka, Jacek & Hafner, Armin & Ostrowski, Ziemowit & Palacz, Michal & Nowak, Andrzej J. & Banasiak, Krzysztof, 2018. "System model derivation of the CO2 two-phase ejector based on the CFD-based reduced-order model," Energy, Elsevier, vol. 144(C), pages 941-956.
    • Handle: RePEc:eee:energy:v:144:y:2018:i:c:p:941-956
    DOI: 10.1016/j.energy.2017.12.055
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    References listed on IDEAS

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    1. Chen, Xiangjie & Worall, Mark & Omer, Siddig & Su, Yuehong & Riffat, Saffa, 2013. "Theoretical studies of a hybrid ejector CO2 compression cooling system for vehicles and preliminary experimental investigations of an ejector cycle," Applied Energy, Elsevier, vol. 102(C), pages 931-942.
    2. Chesi, Andrea & Esposito, Fabio & Ferrara, Giovanni & Ferrari, Lorenzo, 2014. "Experimental analysis of R744 parallel compression cycle," Applied Energy, Elsevier, vol. 135(C), pages 274-285.
    3. Padilla, Ricardo Vasquez & Too, Yen Chean Soo & Benito, Regano & McNaughton, Robbie & Stein, Wes, 2016. "Thermodynamic feasibility of alternative supercritical CO2 Brayton cycles integrated with an ejector," Applied Energy, Elsevier, vol. 169(C), pages 49-62.
    4. Sumeru, K. & Nasution, H. & Ani, F.N., 2012. "A review on two-phase ejector as an expansion device in vapor compression refrigeration cycle," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(7), pages 4927-4937.
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    Cited by:

    1. 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.
    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.
    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. Zheng, Ping & Li, Bing & Qin, Jingxuan, 2018. "CFD simulation of two-phase ejector performance influenced by different operation conditions," Energy, Elsevier, vol. 155(C), pages 1129-1145.
    5. 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.
    6. 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.

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