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Parametric Study for an Oscillating Water Column Wave Energy Conversion System Installed on a Breakwater

Author

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  • Hsien Hua Lee

    (Department of Marine Environment and Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan)

  • Cheng-Han Chen

    (Department of Marine Environment and Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan)

Abstract

This study focuses on the analysis of the parameters of an oscillating water column (OWC) wave energy conversion system and wave conditions. Interactions between the dimensions of the OWC chambers and wave conditions are all taken into account to design an alternative OWC converter, called caisson-based OWC type wave energy converting system. A numerical method using an unsteady Navier-Stokes equations theorem in conservation form is used to analyze the proposed analytical model. The objective of this study is to try to apply an OWC wave energy converter to a caisson breakwater, which has been constructed in a harbor. The structure proposed in this study is a series of sets of independent systems, in which each set of converters is composed of three chambers to capture the wave energy, while better ensuring the safety of the caisson breakwater. Responses to be analyzed related to the conversion efficiency of the caisson-based OWC wave energy converting system include the airflow velocity from the air-chamber, the pneumatic power and the conversion efficiency in terms of a ratio between the pneumatic power and the energy of the incident waves. Parameters examined in this study include the dimensions of the OWC chamber features such as the orifice of the air-chamber allowing airflow in/output, the chamber length along the direction of incident waves, the size of the opening gate for incident waves and the submersion depth of the air-chamber. As found from the results, a best conversion efficiency from incident waves of 32% can be obtained for the extreme case where the orifice is very small, but for most other cases in the study, the best efficiency is about 15%.

Suggested Citation

  • Hsien Hua Lee & Cheng-Han Chen, 2020. "Parametric Study for an Oscillating Water Column Wave Energy Conversion System Installed on a Breakwater," Energies, MDPI, vol. 13(8), pages 1-22, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:1926-:d:345465
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    References listed on IDEAS

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