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Thermo-fluid dynamics preliminary design of turbo-expanders for ORC cycles

Author

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  • Fiaschi, Daniele
  • Manfrida, Giampaolo
  • Maraschiello, Francesco

Abstract

Selecting the best design options for turbo-expanders to be used in Organic Rankine Power Cycle applications is a difficult task, with special reference to the low-temperature applications (T<150°C) which are relevant for specific fields in rapid development (geothermal binary plants, solar thermal energy conversion systems). A wide literature exists on the optimal selection of the working fluid from the thermodynamic point of view; while the fluid dynamics design is often based on the direct application of CFD techniques, without a preliminary screening on the issues of application of a specific working fluid. In practice, however, the selection of the working fluid has relevant effects both on the cycle thermodynamics and on the fluid dynamic losses and turbo-expander efficiency. Referring to a radial-type turbo-expander, a comparison of different working fluids is presented and discussed.

Suggested Citation

  • Fiaschi, Daniele & Manfrida, Giampaolo & Maraschiello, Francesco, 2012. "Thermo-fluid dynamics preliminary design of turbo-expanders for ORC cycles," Applied Energy, Elsevier, vol. 97(C), pages 601-608.
    • Handle: RePEc:eee:appene:v:97:y:2012:i:c:p:601-608
    DOI: 10.1016/j.apenergy.2012.02.033
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    References listed on IDEAS

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