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Computational fluid dynamics simulations of a two-phase R-744 ejector geometry in expansion processes of vapor-compression refrigeration systems.

Number: 0480

Author(s) : KANBUR B. B., MARKUSSEN W. B., BUSCH A., KRIEZI E. E., KÆRN M. R., KRISTOFERSSON J., WALTHER J. H.

Summary

Carbon dioxide (CO2), also known as R744, is a natural working fluid in vapor-compression refrigeration systems (VCRS) that brings advantages from the aspects of sustainability and high efficiency, especially when VCRS are operated with ejectors. This study reports on computational fluid dynamics (CFD) simulations for a two-phase R744 ejector in transcritical operating conditions (OC) by applying a multiphase mixture model in a commercial CFD solver. Two different OCs were considered with the inlet pressures of 63.83 bar and 66.51 bar at the motive inlet and 26.36 bar and 29.44 bar at the suction inlet, respectively. Results showed that the deviation of mass entrainment ratio between the simulated results and the experimental data was 4.2 % and 13.9 % for two different cases. Based on the simulation results, the fields of pressure, temperature, mass fraction, and Mach number were analysed. The maximum Mach number was found no greater than 1.45.

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Details

  • Original title: Computational fluid dynamics simulations of a two-phase R-744 ejector geometry in expansion processes of vapor-compression refrigeration systems.
  • Record ID : 30031801
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0480

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