Cristin-resultat-ID: 1858925
Sist endret: 11. desember 2020, 18:06
NVI-rapporteringsår: 2020
Resultat
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
2020

Non-equilibrium approach in simulations of the R744 flow through the motive nozzle of the two-phase ejector

Bidragsytere:
  • Jakub Bodys
  • Jacek Smolka
  • Michał Palacz
  • Michal Haida og
  • Krzysztof Banasiak

Bok

Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020
ISBN:
  • 978-2-36215-040-1

Utgiver

International Institute of Refrigeration
NVI-nivå 1

Serie

Science et technique du froid
ISSN 0151-1637
NVI-nivå 1

Om resultatet

Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Publiseringsår: 2020
Hefte: 14
ISBN:
  • 978-2-36215-040-1
Open Access

Klassifisering

Fagfelt (NPI)

Fagfelt: Energi
- Fagområde: Realfag og teknologi

Beskrivelse Beskrivelse

Tittel

Non-equilibrium approach in simulations of the R744 flow through the motive nozzle of the two-phase ejector

Sammendrag

The ejector technology for R744 systems was continuously improved over the last two decades in the area of control and design processes. The latter should be related with a significant interest on modelling approaches including numerical simulations. However, some limitations of the existing approaches are still present, while the application range of the ejectors is still increasing regarding mobile and domestic applications. Namely, a quality of the flow prediction in the transcritical two-phase ejector varies depending on the operating conditions and correlated phenomena. The accurate and time efficient computational approach including the operating range of low condensing pressures is presented with the aim of more effective ejector design. The mixture approach developed on the basis of the Homogeneous Equilibrium Model is described regarding prediction of the motive and suction mass flow rate which are crucial for proper control procedures of the ejector-based refrigeration cycle. Additional equation for the vapour quality transport and re-formulated property definitions are utilised for proper control of the evaporation process in the motive nozzle of the ejector. Coefficients in source terms of the quality equation were mapped regarding high accuracy of the motive mass flow rate prediction. Hence, the calibration procedure of the coefficients, resulting in an approximation function as well as mapping of the suction nozzle accuracy regarding turbulence modelling and cavitation phenomena are introduced in this study. Finally, a comparison with the baseline homogeneous equilibrium model is given on the basis of the mass flow rate prediction and field parameters. Keywords: Carbon Dioxide, Transcritical Ejector, Phase change modelling, Expansion modelling

Bidragsytere

Jakub Bodys

  • Tilknyttet:
    Forfatter
    ved Politechnika Śląska

Jacek Smolka

  • Tilknyttet:
    Forfatter
    ved Politechnika Śląska

Michał Palacz

  • Tilknyttet:
    Forfatter
    ved Politechnika Śląska

Michal Haida

  • Tilknyttet:
    Forfatter
    ved Politechnika Śląska

Krzysztof Banasiak

  • Tilknyttet:
    Forfatter
    ved Termisk energi ved SINTEF Energi AS
1 - 5 av 5

Resultatet er en del av Resultatet er en del av

Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.

Japan Society of Refrigerating, and Air Conditioning Engineers. 2020, International Institute of Refrigeration. Vitenskapelig antologi/Konferanseserie
1 - 1 av 1