On the effects of geometry control on the performance of overtopping wave energy converters

Lander Victor, Peter Troch, Jens Peter Kofoed

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Overtopping wave energy converters (OWECs) are designed to extract energy from ocean waves based on wave overtopping into a reservoir, which is emptied into the ocean through a set of low-head turbines, and typically feature a low crest freeboard and a smooth impermeable steep slope. In the process of optimizing the performance of OWECs, the question arises whether adapting the slope geometry to the variable wave characteristics at the deployment site (i.e., geometry control) can increase the overall hydraulic efficiency and overall hydraulic power compared to a fixed slope geometry. The effect of five different geometry control scenarios on the overall hydraulic efficiency and overall hydraulic power of OWECs has been simulated for three possible deployment sites using empirical prediction formulae. The results show that the effect of an adaptive slope angle is relatively small. On the other hand, adapting the crest freeboard of the OWECs to the wave characteristics increases the overall hydraulic efficiency and power. Based on the simulations, gains in overall hydraulic power of at least 30% are achievable when applying an adaptive crest freeboard compared to a fixed crest freeboard.

Original languageEnglish (US)
Pages (from-to)1574-1600
Number of pages27
JournalEnergies
Volume4
Issue number10
DOIs
StatePublished - Oct 2011
Externally publishedYes

Keywords

  • Crest freeboard
  • Geometry control
  • Hydraulic efficiency
  • Hydraulic power
  • Overtopping
  • Slope angle
  • Wave energy

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

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