Performance predictions of one-way energy capture by an oscillating water column device in Faroese waters

Bárdur Joensen, Harry B. Bingham, Robert Read, Kim Nielsen, Jokin Brito Trevino

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    Abstract

    Here we investigate the performance of an experimentally tested model-scale oscillating water column (OWC) device, modified to only exploit half of the wave cycle. To do this we integrate a passive valve system into the OWC chamber which ensures a free connection to the atmosphere either on the up- or the down-stroke, but sends the flow through the orifice plate representing the full-scale air turbine, on the other half-cycle. The performance of the experimental model is evaluated from the absorbed power of the OWC chamber. The absorbed power is computed from the measured pressure drop across an orifice plate and the internal surface elevation inside the chamber. Perhaps surprisingly, the device can absorb more energy near resonance when exploiting only half of the cycle than when the full cycle is exploited. Since a one-way turbine is typically much more efficient than a Wells, impulse, bi-radial, or other self-rectifying turbine, this suggests a significant potential gain in overall efficiency from wave to wire. The obtained performance characteristics of the model-scale device are extrapolated to a proposed full-scale device size, and its performance is evaluated in Faroese waters. The performance of the proposed full-scale device is presented in terms of the annual absorbed power
    Original languageEnglish
    Title of host publicationProceedings of the 14th European Wave and Tidal Energy Conference
    Number of pages6
    Publication date2021
    Article number2117
    Publication statusPublished - 2021
    Event14th European Wave and Tidal Energy Conference (EWTEC 2021) - Plymouth, United Kingdom
    Duration: 5 Sept 20219 Sept 2021

    Conference

    Conference14th European Wave and Tidal Energy Conference (EWTEC 2021)
    Country/TerritoryUnited Kingdom
    CityPlymouth
    Period05/09/202109/09/2021
    SeriesThe European Wave and Tidal Energy Conference

    Keywords

    • Wave power
    • Oscillating Water Column
    • One-way energy capture

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