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WHTO: A methodology of calculating the energy extraction of wave energy convertors based on wave height reduction

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  • Shi, Hongda
  • Zhao, Chenyu
  • Hann, Martyn
  • Greaves, Deborah
  • Han, Zhi
  • Cao, Feifei

Abstract

Wave energy has significant worldwide exploitable resource and its exploitation has attracted renewable energy investigator’ attention. Great progress on calculating device performance has been made by means of theoretical, numerical and model tests. This paper presents a method of calculating the energy extraction of a wave energy converter (WEC) based on Wave Height Take-off (WHTO). The method provides a means to improve the capture efficiency of designs, including demonstrating how well different kinds of WEC are optimized for certain wave conditions. Numerical simulations of a heaving buoy and a bottom-hinged pendulum in a 2D wave flume with different damping types (linear and nonlinear) are presented. The results show that the difference between the calculated energy extraction from the wave height reduction and from the model power take-off (PTO) was not significant in a 2D flume. Physical model tests were conducted using a simplified PTO consisting of a system of lifting weights, used to measure the energy extraction directly. Based on both numerical and physical model analyses, the article defines WHTO, which is equivalent to energy extracted by PTO, but determined without taking direct measurements. This paper aims to promote and validate the concept of the WHTO.

Suggested Citation

  • Shi, Hongda & Zhao, Chenyu & Hann, Martyn & Greaves, Deborah & Han, Zhi & Cao, Feifei, 2019. "WHTO: A methodology of calculating the energy extraction of wave energy convertors based on wave height reduction," Energy, Elsevier, vol. 185(C), pages 299-315.
    • Handle: RePEc:eee:energy:v:185:y:2019:i:c:p:299-315
    DOI: 10.1016/j.energy.2019.07.068
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    References listed on IDEAS

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    1. Palha, Artur & Mendes, Lourenço & Fortes, Conceição Juana & Brito-Melo, Ana & Sarmento, António, 2010. "The impact of wave energy farms in the shoreline wave climate: Portuguese pilot zone case study using Pelamis energy wave devices," Renewable Energy, Elsevier, vol. 35(1), pages 62-77.
    2. Shi, Hongda & Cao, Feifei & Liu, Zhen & Qu, Na, 2016. "Theoretical study on the power take-off estimation of heaving buoy wave energy converter," Renewable Energy, Elsevier, vol. 86(C), pages 441-448.
    3. Beels, Charlotte & Troch, Peter & De Visch, Kenneth & Kofoed, Jens Peter & De Backer, Griet, 2010. "Application of the time-dependent mild-slope equations for the simulation of wake effects in the lee of a farm of Wave Dragon wave energy converters," Renewable Energy, Elsevier, vol. 35(8), pages 1644-1661.
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    Cited by:

    1. Gong, Haoxiang & Cao, Feifei & Han, Zhi & Liu, Shangze & Shi, Hongda, 2022. "Study on the wave energy capture spectrum based on wave height take-off," Energy, Elsevier, vol. 250(C).
    2. Han, Zhi & Cao, Feifei & Tao, Ji & Shi, Hongda, 2023. "Study on the energy capture spectrum (ECS) of a multi-DoF buoy under random waves," Energy, Elsevier, vol. 279(C).

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