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Investigating a Small Oil-Flooded Twin-Screw Expander for Waste-Heat Utilisation in Organic Rankine Cycle Systems

Author

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  • Alexander Nikolov

    (Chair of Fluidics, Faculty of Mechanical Engineering, TU Dortmund University, 44227 Dortmund, Germany)

  • Andreas Brümmer

    (Chair of Fluidics, Faculty of Mechanical Engineering, TU Dortmund University, 44227 Dortmund, Germany)

Abstract

Screw-type expanders offer excellent prospects for energy conversion in lower and medium power ranges, for instance as expansion engines in Rankine cycles with regard to either waste or geothermal heat recovery. With the aim of identifying the potential in organic Rankine cycle (ORC) power systems, an oil-flooded twin-screw expander without timing gears was designed and experimentally investigated in an ORC with R245fa as working fluid. Here, the scope for the experimental determination of the expander characteristic map was limited by the test rig specifications. Based on the experimental results, a multi-chamber model of the test twin-screw expander was calibrated and theoretical approaches according to mechanical and hydraulic loss calculation were applied. Consequently, the expander’s complete characteristic map could be calculated. Furthermore, relevant mechanisms influencing the operational behaviour of oil-flooded twin-screw expanders were identified and analysed in-depth.

Suggested Citation

  • Alexander Nikolov & Andreas Brümmer, 2017. "Investigating a Small Oil-Flooded Twin-Screw Expander for Waste-Heat Utilisation in Organic Rankine Cycle Systems," Energies, MDPI, vol. 10(7), pages 1-27, June.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:869-:d:102949
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    References listed on IDEAS

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    1. E. Georges & S. Declaye & O. Dumont & S. Quoilin & V. Lemort, 2013. "Design of a small-scale organic Rankine cycle engine used in a solar power plant," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 8(suppl_1), pages 34-41, April.
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    Cited by:

    1. Dumont, Olivier & Parthoens, Antoine & Dickes, Rémi & Lemort, Vincent, 2018. "Experimental investigation and optimal performance assessment of four volumetric expanders (scroll, screw, piston and roots) tested in a small-scale organic Rankine cycle system," Energy, Elsevier, vol. 165(PA), pages 1119-1127.
    2. Lecompte, Steven & Gusev, Sergei & Vanslambrouck, Bruno & De Paepe, Michel, 2018. "Experimental results of a small-scale organic Rankine cycle: Steady state identification and application to off-design model validation," Applied Energy, Elsevier, vol. 226(C), pages 82-106.

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