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Readdressing working fluid selection with a view to designing a variable geometry ejector

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  • Szabolcs Varga
  • Pedro S. Lebre
  • Armando C. Oliveira

Abstract

A number of factors influence the performance of an ejector, e.g. working fluid, geometry and operating conditions. In the present work, six low-environmental-impact working fluids were evaluated for their use in an ejector cooling system running on low-temperature thermal energy. The numerical analysis was based on a model applying the 1D constant-pressure mixing theory. Ejector performance was assessed for the temperatures of the generator, evaporator and condenser in the range of 80–120°C, 5–15°C and 25–40°C, respectively. The results indicated that owing to its high coefficient of performance and moderate operating pressures throughout the entire ejector cycle, isobutane is a good choice for a refrigerant. The area ratio required for running the ejector in critical mode, under changing operating conditions, varied in a significant range regardless of the selected refrigerant. This clearly indicates the importance of a variable geometry ejector design to strengthen the position of ejector cooling systems among other refrigeration technologies.

Suggested Citation

  • Szabolcs Varga & Pedro S. Lebre & Armando C. Oliveira, 2015. "Readdressing working fluid selection with a view to designing a variable geometry ejector," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 10(3), pages 205-215.
    • Handle: RePEc:oup:ijlctc:v:10:y:2015:i:3:p:205-215.
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    File URL: http://hdl.handle.net/10.1093/ijlct/ctt026
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    Cited by:

    1. Mouhammad El Hassan, 2022. "System COP of Ejector-Based Ground-Source Heat Pumps," Energies, MDPI, vol. 15(22), pages 1-14, November.
    2. Luca Viscito & Gianluca Lillo & Giovanni Napoli & Alfonso William Mauro, 2021. "Waste Heat Driven Multi-Ejector Cooling Systems: Optimization of Design at Partial Load; Seasonal Performance and Cost Evaluation," Energies, MDPI, vol. 14(18), pages 1-25, September.

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