Cristin-resultat-ID: 1133472
Sist endret: 1. februar 2015, 23:31
NVI-rapporteringsår: 2014
Resultat
Vitenskapelig artikkel
2014

A CFD-based investigation of the energy performance of two-phase R744 ejectors to recover the expansion work in refrigeration systems: An irreversibility analysis

Bidragsytere:
  • Krzysztof Banasiak
  • Michal Palacz
  • Armin Hafner
  • Zbigniew Bulinski
  • Jacek Smolka
  • Andrzej J. Nowak
  • mfl.

Tidsskrift

International journal of refrigeration
ISSN 0140-7007
e-ISSN 1879-2081
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2014
Trykket: 2014
Volum: 40
Sider: 328 - 337

Importkilder

Scopus-ID: 2-s2.0-84897879639

Beskrivelse Beskrivelse

Tittel

A CFD-based investigation of the energy performance of two-phase R744 ejectors to recover the expansion work in refrigeration systems: An irreversibility analysis

Sammendrag

A CFD-based numerical analysis of the flow irreversibility in R744 ejectors is presented. A validated CFD tool was used to investigate three cases that were differentiated by the mass flow rate per unit area (mass flux) that passed through the mixer, which represented three dissimilar flow patterns. The mixer mass flux was found to significantly affect the ejector performance both locally and globally. An original approach was introduced to assess the contribution of the local irreversibilities to the overall entropy increase. A new factor was proposed to evaluate the ejector performance based on the reference entropy increase in a classic expansion valve. In addition, the influence of the mixer diameter and length on the ejector performance was numerically analysed, which showed that the effects of both geometric parameters may be significant. Namely, in the conditions considered, both enlargement of the mixer cross section area by 17.4% as well as shortening the mixer length by 33.3% resulted in the increase of the overall entropy growth rate by 8.9% and 5.4%, respectively. © 2013 Elsevier Ltd and IIR. All rights reserved.

Bidragsytere

Krzysztof Banasiak

  • Tilknyttet:
    Forfatter
    ved Termisk energi ved SINTEF Energi AS

Michal Palacz

  • Tilknyttet:
    Forfatter
    ved Politechnika Śląska
Aktiv cristin-person

Armin Hafner

  • Tilknyttet:
    Forfatter
    ved Termisk energi ved SINTEF Energi AS

Zbigniew Bulinski

  • Tilknyttet:
    Forfatter
    ved Politechnika Śląska

Jacek Smolka

  • Tilknyttet:
    Forfatter
    ved Politechnika Śląska
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