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Power take-off selection for a fixed U-OWC wave power plant in the Mediterranean Sea: The case of Roccella Jonica

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  • Scialò, A.
  • Henriques, J.C.C.
  • Malara, G.
  • Falcão, A.F.O.
  • Gato, L.M.C.
  • Arena, F.

Abstract

This paper aims to maximize the performance of a U-type Oscillating Water Column power plant integrated into a breakwater to be built in Roccella Jonica, Mediterranean Sea, Italy. In this location, both prevalent mild waves and less frequent highly energetic sea states occur. The main challenge is to select a Power Take-Off (PTO) system able to operate with high-efficiency in this wave climate without the need of turning the power plant off for safety reasons. A non-linear time-domain wave-to wire model was developed to evaluate the performance of the Roccella Jonica power plant. Capture width ratio results for single and multi-stage Wells turbines were compared with the biradial turbine. The possibility to install a single turbine on combined air chambers was also considered to reduce the overall PTO costs. The rotational speed of the biradial turbine was found to only rarely exceed the maximum allowed limit during the most energetic sea states, while the Wells turbines too often exceeded that limit. The introduction of relief valves was found to be necessary to keep the PTO rotational speed within safety limits. Optimal turbine diameter, generator rated power and multi-chamber configuration were selected by maximizing the performance of the power plant.

Suggested Citation

  • Scialò, A. & Henriques, J.C.C. & Malara, G. & Falcão, A.F.O. & Gato, L.M.C. & Arena, F., 2021. "Power take-off selection for a fixed U-OWC wave power plant in the Mediterranean Sea: The case of Roccella Jonica," Energy, Elsevier, vol. 215(PA).
    • Handle: RePEc:eee:energy:v:215:y:2021:i:pa:s0360544220321927
    DOI: 10.1016/j.energy.2020.119085
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    References listed on IDEAS

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    Cited by:

    1. Ciappi, Lorenzo & Cheli, Lapo & Simonetti, Irene & Bianchini, Alessandro & Talluri, Lorenzo & Cappietti, Lorenzo & Manfrida, Giampaolo, 2022. "Wave-to-wire models of wells and impulse turbines for oscillating water column wave energy converters operating in the Mediterranean Sea," Energy, Elsevier, vol. 238(PA).
    2. Portillo, J.C.C. & Gato, L.M.C. & Henriques, J.C.C. & Falcão, A.F.O., 2023. "Implications of spring-like air compressibility effects in floating coaxial-duct OWCs: Experimental and numerical investigation," Renewable Energy, Elsevier, vol. 212(C), pages 478-491.
    3. Zhu, Guixun & Samuel, John & Zheng, Siming & Hughes, Jason & Simmonds, David & Greaves, Deborah, 2023. "Numerical investigation on the hydrodynamic performance of a 2D U-shaped Oscillating Water Column wave energy converter," Energy, Elsevier, vol. 274(C).
    4. Güths, A.K. & Teixeira, P.R.F. & Didier, E., 2022. "A novel geometry of an onshore Oscillating Water Column wave energy converter," Renewable Energy, Elsevier, vol. 201(P1), pages 938-949.
    5. 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.
    6. Morais, F.J.F. & Carrelhas, A.A.D. & Gato, L.M.C., 2023. "Biplane-rotor Wells turbine: The influence of solidity, presence of guide vanes and comparison with other configurations," Energy, Elsevier, vol. 276(C).
    7. 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).

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