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On the effects of leakages in Sliding Rotary Vane Expanders

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  • Fatigati, Fabio
  • Di Bartolomeo, Marco
  • Cipollone, Roberto

Abstract

Rotary Vane Expanders (RVE) are very suitable prime movers for ORC-based power units in on-the-road transportation sector. RVEs suffer volumetric efficiency deficits due to leakages which limit the overall expander efficiency and can vanish their intrinsic benefits with respect to the other prime movers. Making reference to a 2 kW Sliding RVE type (SRVE), the paper presents a theoretical and experimental contribution which goes deep into the effect of leakages inside the machine and aims to quantify their amount and effects on the expander performances. The results showed that the volumetric losses increase the mass flow rate aspirated by the machine if the intake pressure is kept constant. This increase favors a greater recovery from the hot source (up to 50%) but part of it bypasses the vanes, producing a volumetric loss. An interesting feature is that part of this additional mass is exchanged among vanes and this produces a beneficial effect on the indicated power (16.6% increase with respect the ideal case). The resulting knowledge further supported the effectiveness of dual intake expander technology which allows to theoretically reduce the leakages between adjacent vane up to 60–70% ensuring an improvement of expander efficiency.

Suggested Citation

  • Fatigati, Fabio & Di Bartolomeo, Marco & Cipollone, Roberto, 2020. "On the effects of leakages in Sliding Rotary Vane Expanders," Energy, Elsevier, vol. 192(C).
    • Handle: RePEc:eee:energy:v:192:y:2020:i:c:s0360544219324168
    DOI: 10.1016/j.energy.2019.116721
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    References listed on IDEAS

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    Cited by:

    1. Fatigati, Fabio & Di Battista, Davide & Cipollone, Roberto, 2021. "Design improvement of volumetric pump for engine cooling in the transportation sector," Energy, Elsevier, vol. 231(C).
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    3. Li, Xiaoya & Xu, Bin & Tian, Hua & Shu, Gequn, 2021. "Towards a novel holistic design of organic Rankine cycle (ORC) systems operating under heat source fluctuations and intermittency," Renewable and Sustainable Energy Reviews, Elsevier, vol. 147(C).
    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. Ali Naseri & Ramin Moradi & Luca Cioccolanti & Alison Subiantoro, 2023. "Impact of the Lubricant on a Modified Revolving Vane Expander (M-RVE) in an Organic Rankine Cycle System," Energies, MDPI, vol. 16(14), pages 1-17, July.
    6. Xiong, Yaxuan & Zhang, Aitonglu & Peng, Xiaodong & Yao, Chenhua & Wang, Nan & Wu, Yuting & Xu, Qian & Ma, Chongfang, 2023. "Investigation of a sole gas expander for gas pressure regulation and energy recovery," Energy, Elsevier, vol. 281(C).
    7. 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).
    8. Naseri, Ali & Norris, Stuart & Subiantoro, Alison, 2020. "Experimental investigation of a prototype semi-dry revolving vane expander: Design challenges and performance criteria," Energy, Elsevier, vol. 205(C).
    9. Naseri, Ali & Moradi, Ramin & Norris, Stuart & Subiantoro, Alison, 2022. "Experimental investigation of a revolving vane expander in a micro-scale organic Rankine cycle system for low-grade waste heat recovery," Energy, Elsevier, vol. 253(C).

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