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CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf)

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  • Anas F A Elbarghthi

    (Department of Applied Mechanics, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic)

  • Saleh Mohamed

    (Department of Mechanical and Materials Engineering, Masdar Institute, Khalifa University of Science and Technology, Abu Dhabi, UAE)

  • Van Vu Nguyen

    (Department of Applied Mechanics, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic)

  • Vaclav Dvorak

    (Department of Applied Mechanics, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic)

Abstract

The field of computational fluid dynamics has been rekindled by recent researchers to unleash this powerful tool to predict the ejector design, as well as to analyse and improve its performance. In this paper, CFD simulation was conducted to model a 2-D axisymmetric supersonic ejector using NIST real gas model integrated in ANSYS Fluent to probe the physical insight and consistent with accurate solutions. HFOs (1234ze(E) and 1234yf) were used as working fluids for their promising alternatives, low global warming potential (GWP), and adhering to EU Council regulations. The impact of different operating conditions, performance maps, and the Pareto frontier performance approach were investigated. The expansion ratio of both refrigerants has been accomplished in linear relationship using their critical compression ratio within ±0.30% accuracy. The results show that R1234yf achieved reasonably better overall performance than R1234ze(E). Generally, by increasing the primary flow inlet saturation temperature and pressure, the entrainment ratio will be lower, and this allows for a higher critical operating back pressure. Moreover, it was found out that increasing the degree of superheat for inlet primary flow by 25 K improved the entrainment ratio by almost 20.70% for R1234yf. Conversely, increasing the degree of superheat to the inlet secondary flow has a relativity negative impact on the performance. The maximum overall ejector efficiency reached was 0.372 and 0.364 for R1234yf and R1234ze(E) respectively. Comparing the results using ideal gas model, the ejector entrainment ratio was overestimated up to 50.26% for R1234yf and 25.66% for R1234ze(E) higher than using real gas model.

Suggested Citation

  • Anas F A Elbarghthi & Saleh Mohamed & Van Vu Nguyen & Vaclav Dvorak, 2020. "CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf)," Energies, MDPI, vol. 13(6), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1408-:d:333769
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    References listed on IDEAS

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    Cited by:

    1. Anas F. A. Elbarghthi & Mohammad Yousef Hdaib & Václav Dvořák, 2021. "A Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems," Energies, MDPI, vol. 14(22), pages 1-22, November.
    2. Kexin Yi & Yuanyang Zhao & Guangbin Liu & Qichao Yang & Guoxin Yu & Liansheng Li, 2022. "Performance Evaluation of Centrifugal Refrigeration Compressor Using R1234yf and R1234ze(E) as Drop-In Replacements for R134a Refrigerant," Energies, MDPI, vol. 15(7), pages 1-17, March.

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