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Thermodynamics of the OWC chamber: Experimental turbine performance under stationary flow

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  • Moñino, A.
  • Quirós, C.
  • Mengíbar, F.
  • Medina-Lopez, E.
  • Clavero, M.

Abstract

Among the different devices designed to extract energy from waves, the Oscillating Water Column (OWC) operating an air turbine has been one of the most studied in recent years. The aim of this paper is to study the polytropic exponent associated to the thermodynamic process that takes place through the turbine in a non-idealised environment. A real gas model is applied, considering the influence of the moisture in the air chamber. Experimental data from a simplified OWC chamber set up under stationary flow are interpreted within the frame of an analytical real gas model. For that purpose, thermodynamic variables involved in the compression/expansion process have been calculated with the implementation of a real gas model. Following the results, in which differences between the ideal gas adiabatic polytropic process and the real gas model are observed, a new value for the polytropic exponent is proposed, representing a non–adiabatic real gas behaviour for the air–water vapour mixture. This approach allows a fine adjustment prediction of OWC performance, that can result more realistic in the case of OWC performance prediction under moderate wave climate conditions. From that on, new management guidelines can be developed, in which eventually moderate/low production prospects can be counterbalanced with more efficient and low–cost design.

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  • Moñino, A. & Quirós, C. & Mengíbar, F. & Medina-Lopez, E. & Clavero, M., 2020. "Thermodynamics of the OWC chamber: Experimental turbine performance under stationary flow," Renewable Energy, Elsevier, vol. 155(C), pages 317-329.
    • Handle: RePEc:eee:renene:v:155:y:2020:i:c:p:317-329
    DOI: 10.1016/j.renene.2020.03.141
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    References listed on IDEAS

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    Cited by:

    1. Ciappi, Lorenzo & Simonetti, Irene & Bianchini, Alessandro & Cappietti, Lorenzo & Manfrida, Giampaolo, 2022. "Application of integrated wave-to-wire modelling for the preliminary design of oscillating water column systems for installations in moderate wave climates," Renewable Energy, Elsevier, vol. 194(C), pages 232-248.
    2. Molina, A. & Jiménez-Portaz, M. & Clavero, M. & Moñino, A., 2022. "The effect of turbine characteristics on the thermodynamics and compression process of a simple OWC device," Renewable Energy, Elsevier, vol. 190(C), pages 836-847.
    3. Molina-Salas, A. & Quirós, C. & Gigant, P. & Huertas-Fernández, F. & Clavero, M. & Moñino, A., 2023. "Exergy assessment and sustainability of a simple off-shore oscillating water column device," Energy, Elsevier, vol. 264(C).
    4. Dimitrios N. Konispoliatis & Georgios M. Katsaounis & Dimitrios I. Manolas & Takvor H. Soukissian & Stylianos Polyzos & Thomas P. Mazarakos & Spyros G. Voutsinas & Spyridon A. Mavrakos, 2021. "REFOS: A Renewable Energy Multi-Purpose Floating Offshore System," Energies, MDPI, vol. 14(11), pages 1-28, May.

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