Geometry assessment of a sloped type wave energy converter

Gianmaria Giannini; Mario López; Victor Ramos; Claudio A. Rodríguez; Paulo Rosa-Santos; Francisco Taveira-Pinto

doi:10.1016/j.renene.2021.02.132

Geometry assessment of a sloped type wave energy converter

Gianmaria Giannini^*, Mario López, Victor Ramos, Claudio A. Rodríguez, Paulo Rosa-Santos, Francisco Taveira-Pinto

^*Corresponding author for this work

Naval Architecture, Ocean And Marine Engineering

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

49 Downloads (Pure)

Abstract

Oscillatory wave energy converters of the sloped type may allow absorbing power from ocean waves efficiently if a valid optimal design is used. In earlier studies, the optimized geometry for the CECO device was defined by implementing a simplified frequency-domain model. In this paper, that geometry is evaluated against the former one by taking into consideration a more realistic modelling approach and assessment scenario. The two geometries were benchmarked through a time-domain model, which allows taking into account realistic sea states and the use of end-stops to limit the amplitude of CECO motions. It was concluded that the optimized geometry allows extra energy production for most of the irregular sea states evaluated (45% more annual energy production). Performance indices were also used to compare the two geometries and it was concluded that the optimized geometry was particularly advantageous for the more energetic sea states. Overall, this study clearly shows that the choice of the generator rated power and end-stops span length are key aspects in determining realistically the annual energy production of sloped-motion wave energy converters.

Original language	English
Pages (from-to)	672-686
Number of pages	15
Journal	Renewable Energy
Volume	171
Early online date	27 Feb 2021
DOIs	https://doi.org/10.1016/j.renene.2021.02.132
Publication status	Published - 30 Jun 2021

Funding

The authors would like to thank the support from: the Project OPWEC - POCI-01-0145-FEDER-016882 and PTDC/MAR-TEC/6984/2014 , funded/co-funded by FEDER through COMPETE 2020 – Programa Operacional Competitividade e Internacionalização (POCI) and by Portuguese national funds, through the Portuguese Foundation for Science and Technology (FCT) , IP; and the project PORTOS – Ports Towards Energy Self-Sufficiency ( EAPA 784/2018 ), co-financed by the Interreg Atlantic Area Programme through the European Regional Development Fund. Furthermore, for this work, V. Ramos has been supported by the program of Stimulus of Scientific Employment Individual Support ( CEECIND/03665/2018 ) from FCT . The authors would like to thank the support from: the Project OPWEC - POCI-01-0145-FEDER-016882 and PTDC/MAR-TEC/6984/2014, funded/co-funded by FEDER through COMPETE 2020 ? Programa Operacional Competitividade e Internacionaliza??o (POCI) and by Portuguese national funds, through the Portuguese Foundation for Science and Technology (FCT), IP; and the project PORTOS ? Ports Towards Energy Self-Sufficiency (EAPA 784/2018), co-financed by the Interreg Atlantic Area Programme through the European Regional Development Fund. Furthermore, for this work, V. Ramos has been supported by the program of Stimulus of Scientific Employment Individual Support (CEECIND/03665/2018) from FCT.

Keywords

efficiency
geometry optimization
numerical modelling
ocean energy
oscillating body
WEC

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10.1016/j.renene.2021.02.132

Giannini-etal-RE-2021-Geometry-assessment-of-a-sloped-type-wave-energyAccepted author manuscript, 6.2 MBLicence: CC BY-NC-ND 4.0

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title = "Geometry assessment of a sloped type wave energy converter",

abstract = "Oscillatory wave energy converters of the sloped type may allow absorbing power from ocean waves efficiently if a valid optimal design is used. In earlier studies, the optimized geometry for the CECO device was defined by implementing a simplified frequency-domain model. In this paper, that geometry is evaluated against the former one by taking into consideration a more realistic modelling approach and assessment scenario. The two geometries were benchmarked through a time-domain model, which allows taking into account realistic sea states and the use of end-stops to limit the amplitude of CECO motions. It was concluded that the optimized geometry allows extra energy production for most of the irregular sea states evaluated (45% more annual energy production). Performance indices were also used to compare the two geometries and it was concluded that the optimized geometry was particularly advantageous for the more energetic sea states. Overall, this study clearly shows that the choice of the generator rated power and end-stops span length are key aspects in determining realistically the annual energy production of sloped-motion wave energy converters.",

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author = "Gianmaria Giannini and Mario L{\'o}pez and Victor Ramos and Rodr{\'i}guez, {Claudio A.} and Paulo Rosa-Santos and Francisco Taveira-Pinto",

year = "2021",

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doi = "10.1016/j.renene.2021.02.132",

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AU - Giannini, Gianmaria

AU - López, Mario

AU - Ramos, Victor

AU - Rodríguez, Claudio A.

AU - Rosa-Santos, Paulo

AU - Taveira-Pinto, Francisco

PY - 2021/6/30

Y1 - 2021/6/30

N2 - Oscillatory wave energy converters of the sloped type may allow absorbing power from ocean waves efficiently if a valid optimal design is used. In earlier studies, the optimized geometry for the CECO device was defined by implementing a simplified frequency-domain model. In this paper, that geometry is evaluated against the former one by taking into consideration a more realistic modelling approach and assessment scenario. The two geometries were benchmarked through a time-domain model, which allows taking into account realistic sea states and the use of end-stops to limit the amplitude of CECO motions. It was concluded that the optimized geometry allows extra energy production for most of the irregular sea states evaluated (45% more annual energy production). Performance indices were also used to compare the two geometries and it was concluded that the optimized geometry was particularly advantageous for the more energetic sea states. Overall, this study clearly shows that the choice of the generator rated power and end-stops span length are key aspects in determining realistically the annual energy production of sloped-motion wave energy converters.

AB - Oscillatory wave energy converters of the sloped type may allow absorbing power from ocean waves efficiently if a valid optimal design is used. In earlier studies, the optimized geometry for the CECO device was defined by implementing a simplified frequency-domain model. In this paper, that geometry is evaluated against the former one by taking into consideration a more realistic modelling approach and assessment scenario. The two geometries were benchmarked through a time-domain model, which allows taking into account realistic sea states and the use of end-stops to limit the amplitude of CECO motions. It was concluded that the optimized geometry allows extra energy production for most of the irregular sea states evaluated (45% more annual energy production). Performance indices were also used to compare the two geometries and it was concluded that the optimized geometry was particularly advantageous for the more energetic sea states. Overall, this study clearly shows that the choice of the generator rated power and end-stops span length are key aspects in determining realistically the annual energy production of sloped-motion wave energy converters.

KW - efficiency

KW - geometry optimization

KW - numerical modelling

KW - ocean energy

KW - oscillating body

KW - WEC

U2 - 10.1016/j.renene.2021.02.132

DO - 10.1016/j.renene.2021.02.132

M3 - Article

AN - SCOPUS:85102038672

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VL - 171

SP - 672

EP - 686

JO - Renewable Energy

JF - Renewable Energy

ER -

Geometry assessment of a sloped type wave energy converter

Abstract

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Keywords

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