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Experimental investigation and optimal performance assessment of four volumetric expanders (scroll, screw, piston and roots) tested in a small-scale organic Rankine cycle system

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  • Dumont, Olivier
  • Parthoens, Antoine
  • Dickes, Rémi
  • Lemort, Vincent

Abstract

The aim of this paper is to facilitate the selection of the expander for a small-scale organic Rankine cycle based on an experimental comparison of a piston, a screw, a scroll and a roots expander. First, based on a literature review, a comparison between these four technologies of volumetric expansion machines is performed. Afterward, four displacement expanders [2–4 kW] are tested on two similar small-scale ORC unit with fluid R245fa. The maximum effective isentropic efficiencies measured are 53% for the piston expander and the screw expander, 76% for the variable-speed scroll and 48% for the roots machine. However, these performances do not reflect the highest efficiencies achievable by each expander: the test-rig presents experimental limitations in terms of mass flow rate and pressure drop (among others) that restricts the achievable operating conditions. The calibration of semi-empirical models based on the measurements allows to overcome this issue and to predict the isentropic efficiency in optimal conditions despite the limitations of the test-rigs. Based on experimental results, extrapolated prediction of the semi-empirical model and practical considerations, some guidelines are drawn to help the reader to select properly a volumetric expander.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:165:y:2018:i:pa:p:1119-1127
    DOI: 10.1016/j.energy.2018.06.182
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    References listed on IDEAS

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    1. Dickes, Rémi & Dumont, Olivier & Daccord, Rémi & Quoilin, Sylvain & Lemort, Vincent, 2017. "Modelling of organic Rankine cycle power systems in off-design conditions: An experimentally-validated comparative study," Energy, Elsevier, vol. 123(C), pages 710-727.
    2. 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.
    3. Yulia Glavatskaya & Pierre Podevin & Vincent Lemort & Osoko Shonda & Georges Descombes, 2012. "Reciprocating Expander for an Exhaust Heat Recovery Rankine Cycle for a Passenger Car Application," Energies, MDPI, vol. 5(6), pages 1-15, June.
    4. Giuffrida, Antonio, 2017. "Improving the semi-empirical modelling of a single-screw expander for small organic Rankine cycles," Applied Energy, Elsevier, vol. 193(C), pages 356-368.
    5. 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.
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