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The R744 multi-ejector hybrid CFD and experimentally-based reduced-order model

Abstract

The proposed hybrid reduced-order model (HROM) of the four R744 fixed ejectors installed in the multiejector module is presented. The ejectors HROM was built by use of the proper orthogonal decomposition together with the radial basis function interpolation to obtain high-accuracy model for a wide range of the subcritical and transcritical operating regimes. The input data for the proposed model was the combination of the experimental data of the investigated ejectors together with the numerical results obtained by use of the ejectorPL platform. The proposed HROM of each R744 vapour fixed ejector obtained a satisfactory accuracy of the motive and the suction nozzle mass flow rates for most validated points and significantly reduced the computational time. Hence, the proposed HROM of the R744 vapour fixed ejectors was successfully implemented to the Modelica dynamic simulations of the R744 refrigeration system to evaluate the system energy performance corresponding to the real ejector performance at different operating conditions.
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Category

Academic chapter

Language

English

Author(s)

  • Michal Haida
  • Jacek Smolka
  • Armin Hafner
  • Michal Palacz
  • Zeimowit Ostrowski
  • Kenneth B. Madsen
  • Sven Försterling
  • Andrzej J. Nowak
  • Krzysztof Banasiak

Affiliation

  • SINTEF Energy Research / Termisk energi
  • Danfoss Drives AS
  • Silesian University of Technology
  • Germany
  • Norwegian University of Science and Technology

Year

2018

Publisher

International Institute of Refrigeration

Book

Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018

ISBN

9782362150265

View this publication at Norwegian Research Information Repository