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Analysis of oscillating-water-column wave energy converter configurations for integration into caisson breakwaters

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  • Fox, Brooklyn N.
  • Gomes, Rui P.F.
  • Gato, Luís M.C.

Abstract

Energy production from ocean waves remains in the research and development phase, due in part to the lack of maturity of the technology, as well as the economical unfeasibility of large-scale projects. Integration of wave energy converters into breakwaters is a strategy to improve the economic viability of the energy conversion system. The cost of electricity is reduced through the sharing of construction, installation, maintenance and operation activities. This work focuses on the design of an oscillating-water-column device to be integrated into a caisson used for breakwaters. A numerical model based on linear potential flow theory was developed. The viscous flow effects in the duct and the nonlinear turbine damping characteristic were linearized for the application of a frequency domain analysis. Furthermore, the device performance was estimated under irregular wave conditions using stochastic modelling for three wave climates and the influence of tidal variability is studied. The design and performance optimization of the submerged duct, air chamber and turbine are considered for the following oscillating-water-column duct configurations: conventional; U-shape; and L-shape. The results show all devices have better power conversion performance for the lower wave periods observed in the Mediterranean Sea than for the studied North Atlantic Ocean wave climates. The U-shaped converter outperforms the other configurations in all three locations, with a maximum theoretical annual pneumatic power of 46.8kW/m when compared with 39.4kW/m and 38.0kW/m for the L-shape and conventional device, respectively. The tidal level variation does have some influence on the device performance, but the impact is minor.

Suggested Citation

  • Fox, Brooklyn N. & Gomes, Rui P.F. & Gato, Luís M.C., 2021. "Analysis of oscillating-water-column wave energy converter configurations for integration into caisson breakwaters," Applied Energy, Elsevier, vol. 295(C).
    • Handle: RePEc:eee:appene:v:295:y:2021:i:c:s0306261921004876
    DOI: 10.1016/j.apenergy.2021.117023
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    References listed on IDEAS

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    3. Falcão, António F.O. & Henriques, João C.C. & Gomes, Rui P.F. & Portillo, Juan C.C., 2022. "Theoretically based correction to model test results of OWC wave energy converters to account for air compressibility effect," Renewable Energy, Elsevier, vol. 198(C), pages 41-50.
    4. Carrelhas, A.A.D. & Gato, L.M.C. & Morais, F.J.F., 2024. "Aerodynamic performance and noise emission of different geometries of Wells turbines under design and off-design conditions," Renewable Energy, Elsevier, vol. 220(C).
    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. Ulazia, Alain & Saenz-Aguirre, Aitor & Ibarra-Berastegui, Gabriel & Sáenz, Jon & Carreno-Madinabeitia, Sheila & Esnaola, Ganix, 2023. "Performance variations of wave energy converters due to global long-term wave period change (1900–2010)," Energy, Elsevier, vol. 268(C).
    7. Foteinis, Spyros, 2022. "Wave energy converters in low energy seas: Current state and opportunities," Renewable and Sustainable Energy Reviews, Elsevier, vol. 162(C).
    8. Portillo, J.C.C. & Henriques, J.C.C. & Gato, L.M.C. & Falcão, A.F.O., 2023. "Model tests on a floating coaxial-duct OWC wave energy converter with focus on the spring-like air compressibility effect," Energy, Elsevier, vol. 263(PA).
    9. Medina Rodríguez, Ayrton Alfonso & Trivedi, Kshma & Koley, Santanu & Oderiz Martinez, Itxaso & Mendoza, Edgar & Posada Vanegas, Gregorio & Silva, Rodolfo, 2023. "Improved hydrodynamic performance of an OWC device based on a Helmholtz resonator," Energy, Elsevier, vol. 273(C).

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