Computational fluid dynamics simulations of two-phase R744 ejectors

Baris Burak Kanbur; Alexander  Busch; Jens Honore Walther; Ekaterini E. Kriezi; Wiebke Brix Markussen; Martin Ryhl Kærn; Jóhannes  Kristófersson

doi:10.18462/iir.nh3-co2.2023.0030

Computational fluid dynamics simulations of two-phase R744 ejectors

Baris Burak Kanbur
, Alexander Busch
, Jens Honore Walther
, Ekaterini E. Kriezi
, Wiebke Brix Markussen
, Martin Ryhl Kærn
, Jóhannes Kristófersson

Danfoss AS
Danish Technological Institute

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Abstract

Carbon dioxide ejectors are efficient energy recovery devices in vapor-compression refrigeration units. This study aims to investigate the possibilities for modelling and analysis of two-phase flow in a specific ejector geometry using two different computational fluid dynamics (CFD) tools based on mixture models in STARCCM+ and ANSYS CFX. The ejector was operated according to six cases with subcritical and supercritical inlet conditions. Results were compared to the previous experimental data with respect to the mass flow rates, mass entrainment ratio, and ejector efficiency. Also, the pressure-related trends in the ejector geometry were investigated by using the pressure fields in the ejector geometry. The ANSYS CFX solver predicted the motive flow in the relative error range of 5.8 % to 13.7 %, while the relative errors were in the range of 4.8 % to 20.2 % in the STAR-CCM+ solver. Besides, the STAR-CCM+ solver achieved better prediction at the suction inlet.

Original language	English
Title of host publication	10th IIR Conference: Ammonia and CO2 Refrigeration Technologies : Proceedings
Number of pages	8
Publisher	International Institute of Refrigeration
Publication date	2023
Article number	0030
DOIs	https://doi.org/10.18462/iir.nh3-co2.2023.0030
Publication status	Published - 2023
Event	10th IIR Conference on Ammonia and CO₂ Refrigeration Technologies - Ohrid, Macedonia, The Former Yugoslav Republic of Duration: 27 Apr 2023 → 29 Apr 2023

Conference

Conference	10th IIR Conference on Ammonia and CO₂ Refrigeration Technologies
Country/Territory	Macedonia, The Former Yugoslav Republic of
City	Ohrid
Period	27/04/2023 → 29/04/2023

Keywords

Refrigeration
Carbon Dioxide
Ejectors
Computational Fluid Dynamics
Energy Recovery
Twophase Flow

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10.18462/iir.nh3-co2.2023.0030

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@inproceedings{5e27b65522de4a0982c749aaa7548bb1,

title = "Computational fluid dynamics simulations of two-phase R744 ejectors",

abstract = "Carbon dioxide ejectors are efficient energy recovery devices in vapor-compression refrigeration units. This study aims to investigate the possibilities for modelling and analysis of two-phase flow in a specific ejector geometry using two different computational fluid dynamics (CFD) tools based on mixture models in STARCCM+ and ANSYS CFX. The ejector was operated according to six cases with subcritical and supercritical inlet conditions. Results were compared to the previous experimental data with respect to the mass flow rates, mass entrainment ratio, and ejector efficiency. Also, the pressure-related trends in the ejector geometry were investigated by using the pressure fields in the ejector geometry. The ANSYS CFX solver predicted the motive flow in the relative error range of 5.8 \% to 13.7 \%, while the relative errors were in the range of 4.8 \% to 20.2 \% in the STAR-CCM+ solver. Besides, the STAR-CCM+ solver achieved better prediction at the suction inlet.",

keywords = "Refrigeration, Carbon Dioxide, Ejectors, Computational Fluid Dynamics, Energy Recovery, Twophase Flow",

author = "Kanbur, \{Baris Burak\} and Alexander Busch and Walther, \{Jens Honore\} and \{E. Kriezi\}, Ekaterini and Markussen, \{Wiebke Brix\} and K{\ae}rn, \{Martin Ryhl\} and J{\'o}hannes Krist{\'o}fersson",

year = "2023",

doi = "10.18462/iir.nh3-co2.2023.0030",

language = "English",

booktitle = "10th IIR Conference: Ammonia and CO2 Refrigeration Technologies",

publisher = "International Institute of Refrigeration",

note = "10th IIR Conference on Ammonia and CO<sub>2</sub> Refrigeration Technologies ; Conference date: 27-04-2023 Through 29-04-2023",

}

Kanbur, BB, Busch, A, Walther, JH, E. Kriezi, E, Markussen, WB, Kærn, MR & Kristófersson, J 2023, Computational fluid dynamics simulations of two-phase R744 ejectors. in 10th IIR Conference: Ammonia and CO2 Refrigeration Technologies: Proceedings., 0030, International Institute of Refrigeration, 10th IIR Conference on Ammonia and CO₂ Refrigeration Technologies, Ohrid, Macedonia, The Former Yugoslav Republic of, 27/04/2023. https://doi.org/10.18462/iir.nh3-co2.2023.0030

Computational fluid dynamics simulations of two-phase R744 ejectors. / Kanbur, Baris Burak; Busch, Alexander ; Walther, Jens Honore et al.
10th IIR Conference: Ammonia and CO2 Refrigeration Technologies: Proceedings. International Institute of Refrigeration, 2023. 0030.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

TY - GEN

T1 - Computational fluid dynamics simulations of two-phase R744 ejectors

AU - Kanbur, Baris Burak

AU - Busch, Alexander

AU - Walther, Jens Honore

AU - E. Kriezi, Ekaterini

AU - Markussen, Wiebke Brix

AU - Kærn, Martin Ryhl

AU - Kristófersson, Jóhannes

PY - 2023

Y1 - 2023

N2 - Carbon dioxide ejectors are efficient energy recovery devices in vapor-compression refrigeration units. This study aims to investigate the possibilities for modelling and analysis of two-phase flow in a specific ejector geometry using two different computational fluid dynamics (CFD) tools based on mixture models in STARCCM+ and ANSYS CFX. The ejector was operated according to six cases with subcritical and supercritical inlet conditions. Results were compared to the previous experimental data with respect to the mass flow rates, mass entrainment ratio, and ejector efficiency. Also, the pressure-related trends in the ejector geometry were investigated by using the pressure fields in the ejector geometry. The ANSYS CFX solver predicted the motive flow in the relative error range of 5.8 % to 13.7 %, while the relative errors were in the range of 4.8 % to 20.2 % in the STAR-CCM+ solver. Besides, the STAR-CCM+ solver achieved better prediction at the suction inlet.

AB - Carbon dioxide ejectors are efficient energy recovery devices in vapor-compression refrigeration units. This study aims to investigate the possibilities for modelling and analysis of two-phase flow in a specific ejector geometry using two different computational fluid dynamics (CFD) tools based on mixture models in STARCCM+ and ANSYS CFX. The ejector was operated according to six cases with subcritical and supercritical inlet conditions. Results were compared to the previous experimental data with respect to the mass flow rates, mass entrainment ratio, and ejector efficiency. Also, the pressure-related trends in the ejector geometry were investigated by using the pressure fields in the ejector geometry. The ANSYS CFX solver predicted the motive flow in the relative error range of 5.8 % to 13.7 %, while the relative errors were in the range of 4.8 % to 20.2 % in the STAR-CCM+ solver. Besides, the STAR-CCM+ solver achieved better prediction at the suction inlet.

KW - Refrigeration

KW - Carbon Dioxide

KW - Ejectors

KW - Computational Fluid Dynamics

KW - Energy Recovery

KW - Twophase Flow

U2 - 10.18462/iir.nh3-co2.2023.0030

DO - 10.18462/iir.nh3-co2.2023.0030

M3 - Article in proceedings

BT - 10th IIR Conference: Ammonia and CO2 Refrigeration Technologies

PB - International Institute of Refrigeration

T2 - 10th IIR Conference on Ammonia and CO<sub>2</sub> Refrigeration Technologies

Y2 - 27 April 2023 through 29 April 2023

ER -

Computational fluid dynamics simulations of two-phase R744 ejectors

Abstract

Conference

Keywords

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