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Numerical Modelling and Experimental Validation of Twin-Screw Expanders

Author

Listed:
  • Kisorthman Vimalakanthan

    (School of Mathematics, Computer Science and Engineering, Department of Mechanical Engineering and Aeronautics, University of London, London EC1V 0HB, UK)

  • Matthew Read

    (School of Mathematics, Computer Science and Engineering, Department of Mechanical Engineering and Aeronautics, University of London, London EC1V 0HB, UK)

  • Ahmed Kovacevic

    (School of Mathematics, Computer Science and Engineering, Department of Mechanical Engineering and Aeronautics, University of London, London EC1V 0HB, UK)

Abstract

Positive displacement machines have been identified as appropriate expanders for small-scale power generation systems such as Organic Rankine Cycles (ORCs). Screw expanders can operate with good efficiency in working fluids under both dry and two-phase conditions. Detailed understanding of the fluid expansion process is required to optimise the machine design and operation for specific applications, and accurate design tools are therefore essential. Using experimental data for air expansion, both CFD and chamber models have been applied to investigate the influence of port flow and leakage on the expansion process. Both models are shown to predict pressure variation and power output with good accuracy. The validated chamber model is then used to identify the optimal volume ratio and rotational speed for experimental conditions.

Suggested Citation

  • Kisorthman Vimalakanthan & Matthew Read & Ahmed Kovacevic, 2020. "Numerical Modelling and Experimental Validation of Twin-Screw Expanders," Energies, MDPI, vol. 13(18), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4700-:d:411058
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    References listed on IDEAS

    as
    1. Matthew Read & Ian Smith & Nikola Stosic & Ahmed Kovacevic, 2016. "Comparison of Organic Rankine Cycle Systems under Varying Conditions Using Turbine and Twin-Screw Expanders," Energies, MDPI, vol. 9(8), pages 1-20, August.
    2. Forman, Clemens & Muritala, Ibrahim Kolawole & Pardemann, Robert & Meyer, Bernd, 2016. "Estimating the global waste heat potential," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 1568-1579.
    3. Bao, Junjiang & Zhao, Li, 2013. "A review of working fluid and expander selections for organic Rankine cycle," Renewable and Sustainable Energy Reviews, Elsevier, vol. 24(C), pages 325-342.
    4. Fischer, Johann, 2011. "Comparison of trilateral cycles and organic Rankine cycles," Energy, Elsevier, vol. 36(10), pages 6208-6219.
    5. Xinxin Zhang & Yin Zhang & Min Cao & Jingfu Wang & Yuting Wu & Chongfang Ma, 2019. "Working Fluid Selection for Organic Rankine Cycle Using Single-Screw Expander," Energies, MDPI, vol. 12(16), pages 1-23, August.
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