Abstract
In 1799, the first wave-power patent was filed. Since then, a significant amount of research has been done on the performance of an oscillating water column (OWC) using linear theory. In general, the use of linear theory has been found to be both judicious and accurate. We used experiment to know what happen in the OWC. A suitable analytical model for devices in shallow water is required to predict the effect of water depth on performance and to provide guidance in device optimization. Because of the lack of clarity in defining why linear theory becomes less accurate in shallow water, digital video recordings were used to analyze the flow around the OWC wave-energy converter. This provided detailed images that could be analyzed both temporally and spatially. The OWC's operation qualitatively differs from that predicted by linear theory, identifying critical flow properties. This paper describes one depth flow and a discussion of its influence on the wave period.
Highlights
There has been an increase in the search for “clean, socially acceptable methods of generating power” [1,2]
Because of the lack of clarity in defining why linear theory becomes less accurate in shallow water, digital video recordings were used to analyze the flow around the oscillating water column (OWC) wave–energy converter
Some of the efforts undertaken by countries to increase the share of renewable energy in their energy consumption include the setting of feed-in tariffs (FITs)
Summary
There has been an increase in the search for “clean, socially acceptable methods of generating power” [1,2]. This is because of two interrelated factors: (1) the global requirement for electricity, which is expected to increase in the 15 years, and (2) the promise by different countries to reduce their CO2 emissions in the same time frame.[8] Some of the efforts undertaken by countries to increase the share of renewable energy in their energy consumption include the setting of feed-in tariffs (FITs). While FITs are targeted at wind and solar energies, the generation of electricity from waves, tidal currents and tides has received renewed interest. The kinetic and potential energy associated with ocean waves can be used at onshore or offshore sites using different wave–energy converter technologies [5,6]
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