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A R744 transcritical refrigeration test rig equipped with a transparent two-phase ejector for flow visualisation: experimental study.

Number: 1215

Author(s) : HAIDA M., FINGAS R., SZWAJNOCH W., SMOLKA J., PALACZ M., BODYS J., NOWAK A. J.

Summary

The R744 transcritical system has high thermodynamic losses during expansion process and there is potential to improve its operation by understanding the complexity of phenomena occurring inside the R744 two-phase ejector. Thus, a two-phase ejector has to be designed based on the accurate numerical model to observe flow behaviour during expansion, mixing processes in mixing section and kinetic energy conversion into pressure energy in diffuser. The main aim of this paper is to perform an experimental study of the R744 transcritical system equipped with the transparent ejector based on the steady-state and long-term system operation. The ejector with a transparent pre-mixer, mixer and diffuser using smooth Plexiglas material was designed using the ejectorPL numerical CFD tool. Determination of the velocity field and analysis of flow structure inside the ejector will be used for additional device shape optimisation. Furthermore, an unsteady effect of the ejector work during change of system operating conditions is investigated. The ejector efficiency up to 30% was recorded for motive nozzle pressure of 90 bar.

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Pages: 8

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Details

  • Original title: A R744 transcritical refrigeration test rig equipped with a transparent two-phase ejector for flow visualisation: experimental study.
  • Record ID : 30027762
  • Languages: English
  • Source: IIR Rankine Conference 2020.
  • Publication date: 2020/07/31
  • DOI: http://dx.doi.org/10.18462/iir.rankine.2020.1215

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