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Thermodynamics of an OWC containing real gas

Author

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  • Medina-López, E.
  • Moñino, A.
  • Borthwick, A.G.L.
  • Clavero, M.

Abstract

Oscillating Water Column (OWC) devices are usually modelled as simple systems containing ideal, dry air. However, high humidity levels are likely to occur in a prototype device open to the sea, particularly in warm climates such as prevail in the lower latitudes. In this paper, a real gas model is implemented to take into account humidity variations inside an OWC chamber. Using a modified adiabatic index, theoretical expressions are derived for the thermodynamic state variables including enthalpy, entropy and specific heat. The model is validated against experimental data, and shown to provide better agreement than obtained using the ideal gas assumption. By calculating real air flow in an OWC it is shown that the mechanical efficiency reduces and the flow phase alters with respect to the ideal gas case. Accurate prediction of efficiency is essential for the optimal design and management of OWC wave energy converters.

Suggested Citation

  • Medina-López, E. & Moñino, A. & Borthwick, A.G.L. & Clavero, M., 2017. "Thermodynamics of an OWC containing real gas," Energy, Elsevier, vol. 135(C), pages 709-717.
    • Handle: RePEc:eee:energy:v:135:y:2017:i:c:p:709-717
    DOI: 10.1016/j.energy.2017.06.164
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    References listed on IDEAS

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    1. López, Iraide & Andreu, Jon & Ceballos, Salvador & Martínez de Alegría, Iñigo & Kortabarria, Iñigo, 2013. "Review of wave energy technologies and the necessary power-equipment," Renewable and Sustainable Energy Reviews, Elsevier, vol. 27(C), pages 413-434.
    2. Medina-López, E. & Moñino Ferrando, A. & Clavero Gilabert, M. & del Pino, C. & Losada Rodríguez, M., 2016. "Note on a real gas model for OWC performance," Renewable Energy, Elsevier, vol. 85(C), pages 588-597.
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    1. 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.
    2. Falcão, António F.O. & Henriques, João C.C., 2019. "The spring-like air compressibility effect in oscillating-water-column wave energy converters: Review and analyses," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 483-498.
    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. Gonçalves, Rafael A.A.C. & Teixeira, Paulo R.F. & Didier, Eric & Torres, Fernando R., 2020. "Numerical analysis of the influence of air compressibility effects on an oscillating water column wave energy converter chamber," Renewable Energy, Elsevier, vol. 153(C), pages 1183-1193.
    5. Molina–Salas, A. & Longo, S. & Clavero, M. & Moñino, A., 2023. "Theoretical approach to the scale effects of an OWC device," Renewable Energy, Elsevier, vol. 219(P2).
    6. Mohapatra, Piyush & Vijay, K.G. & Bhattacharyya, Anirban & Sahoo, Trilochan, 2023. "Influence of distinct bottom geometries on the hydrodynamic performance of an OWC device," Energy, Elsevier, vol. 277(C).
    7. Carlos Perez-Collazo & Deborah Greaves & Gregorio Iglesias, 2018. "A Novel Hybrid Wind-Wave Energy Converter for Jacket-Frame Substructures," Energies, MDPI, vol. 11(3), pages 1-20, March.
    8. Medina-López, E. & Moñino, A. & Bergillos, R.J. & Clavero, M. & Ortega-Sánchez, M., 2019. "Oscillating water column performance under the influence of storm development," Energy, Elsevier, vol. 166(C), pages 765-774.

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