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Pressure Pulsation and Cavitation Phenomena in a Micro-ORC System

Author

Listed:
  • Nicola Casari

    (Department of Engineering (DE), University of Ferrara, 44122 Ferrara, Italy)

  • Ettore Fadiga

    (Department of Engineering (DE), University of Ferrara, 44122 Ferrara, Italy)

  • Michele Pinelli

    (Department of Engineering (DE), University of Ferrara, 44122 Ferrara, Italy)

  • Saverio Randi

    (Department of Engineering (DE), University of Ferrara, 44122 Ferrara, Italy)

  • Alessio Suman

    (Department of Engineering (DE), University of Ferrara, 44122 Ferrara, Italy)

Abstract

Micro-ORC systems are usually equipped with positive displacement machines such as expanders and pumps. The pumping system has to guarantee the mass flow rate and allows a pressure rise from the condensation to the evaporation pressure values. In addition, the pumping system supplies the organic fluid, characterized by pressure and temperature very close to the saturation. In this work, a CFD approach is developed to analyze from a novel point of view the behavior of the pumping system of a regenerative lab-scale micro-ORC system. In fact, starting from the liquid receiver, the entire flow path, up to the inlet section of the evaporator, has been numerically simulated (including the Coriolis flow meter installed between the receiver and the gear pump). A fluid dynamic analysis has been carried out by means of a transient simulation with a mesh morphing strategy in order to analyze the transient phenomena and the effects of pump operation. The analysis has shown how the accuracy of the mass flow rate measurement could be affected by the pump operation being installed in the same circuit branch. In addition, the results have shown how the cavitation phenomenon affects the pump and the ORC system operation compared to control system actions.

Suggested Citation

  • Nicola Casari & Ettore Fadiga & Michele Pinelli & Saverio Randi & Alessio Suman, 2019. "Pressure Pulsation and Cavitation Phenomena in a Micro-ORC System," Energies, MDPI, vol. 12(11), pages 1-18, June.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:11:p:2186-:d:238198
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    References listed on IDEAS

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    Cited by:

    1. Andrea De Pascale, 2021. "Organic Rankine Cycle for Energy Recovery System," Energies, MDPI, vol. 14(17), pages 1-3, August.
    2. Li, Wenguang & Yu, Zhibin, 2021. "Cavitating flows of organic fluid with thermodynamic effect in a diaphragm pump for organic Rankine cycle systems," Energy, Elsevier, vol. 237(C).
    3. Casari, Nicola & Fadiga, Ettore & Pinelli, Michele & Randi, Saverio & Suman, Alessio & Ziviani, Davide, 2020. "Investigation of flow characteristics in a single screw expander: A numerical approach," Energy, Elsevier, vol. 213(C).

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