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Multi-vane expanders: Internal-leakage losses

Author

Listed:
  • Badr, O.
  • Probert, S.D.
  • O'Callaghan, P.W.

Abstract

Secondary flows of the working fluid via internal leakage paths in an MVE contribute significantly to its efficiency reduction. So the major leakage channels were indentified, and a mathematical model for predicting the flow rates via them has been developed. The behaviours of two existing designs of MVEs, using R-113 as the working fluid, were considered. Computer sub-routines were composed and employed to predict the effects of changes in the design and operating variables on the leakage characteristics of the expanders. The predictions indicate that the major internal-leakage flows, in the two MVEs considered, occur past the tips of the vanes. By maintaining continuous contact between the tips of the vanes and the stator cylinder, leakage efficiencies of over 75% are expected for the non-circular expander. The predictions also show by how much the leakage characteristics can be improved by running an existing expander at its optimal operating conditions. Alternatively for a proposed application, there will be an optimal choice of design parameters for an MVE so that the maximum efficiency can be achieved.

Suggested Citation

  • Badr, O. & Probert, S.D. & O'Callaghan, P.W., 1985. "Multi-vane expanders: Internal-leakage losses," Applied Energy, Elsevier, vol. 20(1), pages 1-46.
    • Handle: RePEc:eee:appene:v:20:y:1985:i:1:p:1-46
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    Citations

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    Cited by:

    1. Piotr Kolasiński, 2019. "Application of the Multi-Vane Expanders in ORC Systems—A Review on the Experimental and Modeling Research Activities," Energies, MDPI, vol. 12(15), pages 1-26, August.
    2. Dawo, Fabian & Eyerer, Sebastian & Pili, Roberto & Wieland, Christoph & Spliethoff, Hartmut, 2021. "Experimental investigation, model validation and application of twin-screw expanders with different built-in volume ratios," Applied Energy, Elsevier, vol. 282(PA).
    3. Pantano, Fabio & Capata, Roberto, 2017. "Expander selection for an on board ORC energy recovery system," Energy, Elsevier, vol. 141(C), pages 1084-1096.
    4. Fabio Fatigati & Marco Di Bartolomeo & Davide Di Battista & Roberto Cipollone, 2020. "Experimental Validation of a New Modeling for the Design Optimization of a Sliding Vane Rotary Expander Operating in an ORC-Based Power Unit," Energies, MDPI, vol. 13(16), pages 1-23, August.
    5. Murthy, Anarghya Ananda & Norris, Stuart & Subiantoro, Alison, 2022. "Experimental investigation of internal leakages and effects of lubricating oil on the performance of a four-intersecting-vane rotary expander," Energy, Elsevier, vol. 238(PB).
    6. Fatigati, Fabio & Di Bartolomeo, Marco & Cipollone, Roberto, 2020. "On the effects of leakages in Sliding Rotary Vane Expanders," Energy, Elsevier, vol. 192(C).
    7. Lorenzo Tocci & Tamas Pal & Ioannis Pesmazoglou & Benjamin Franchetti, 2017. "Small Scale Organic Rankine Cycle (ORC): A Techno-Economic Review," Energies, MDPI, vol. 10(4), pages 1-26, March.
    8. Vodicka, Vaclav & Novotny, Vaclav & Zeleny, Zbynek & Mascuch, Jakub & Kolovratnik, Michal, 2019. "Theoretical and experimental investigations on the radial and axial leakages within a rotary vane expander," Energy, Elsevier, vol. 189(C).
    9. Imran, Muhammad & Usman, Muhammad & Park, Byung-Sik & Lee, Dong-Hyun, 2016. "Volumetric expanders for low grade heat and waste heat recovery applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 1090-1109.
    10. Przemysław Błasiak & Piotr Kolasiński & Sindu Daniarta, 2023. "Numerical Analysis of Heat Transfer within a Rotary Multi-Vane Expander," Energies, MDPI, vol. 16(6), pages 1-32, March.

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