On the efficiency of wave energy caissons in array

Thiruvenkatasamy, K.; Neelamani, S.

doi:10.1016/s0141-1187(97)00008-4

Cited by 72 publications

(30 citation statements)

References 5 publications

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“…Further, Sarmento [4] carried out experimental investigations on OWC devices in a wave flume and used filter membranes to represent the pressure drop from a linear PTO device and circular orifice plates to represent non-linear PTO devices to validate the theory presented in Sarmento and Falcão [3]. The importance of PTO damping on the device performance was also seen in experimental investigations by Thiruvenkatasamy and Neelamani [5], where the device efficiency was found to be very low when the area of the vent in the device was increased beyond 0.81% of the free surface area.…”

Section: Introductionmentioning

confidence: 82%

Numerical modeling of power take-off damping in an Oscillating Water Column device

Kamath

Bihs

Arntsen

2015

International Journal of Marine Energy

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An Oscillating Water Column (OWC) is a wave energy converter consisting of a partially submerged chamber with an air column over the water column. The work done by the air column under excitation by the incident waves is used to generate electrical energy through a power take-off (PTO) device. The air column is under pressure due to the damping from the PTO device and this pressure is essential for the extraction of wave energy using the OWC. The relationship between the PTO damping and the hydrodynamic efficiency of the OWC provides more insight into the wave energy extraction using an OWC. namic efficiency increases with increasing incident wavelength. The formation of stagnation zones in the water due to high velocities for lower values of PTO damping is found to reduce the hydrodynamic efficiency.

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Section: Introductionmentioning

confidence: 82%

Numerical modeling of power take-off damping in an Oscillating Water Column device

Kamath

Bihs

Arntsen

2015

International Journal of Marine Energy

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“…In the 1980s, Ojima et al [10] advocated the OWC-type breakwater. Afterward, the bottom-sitting OWC caisson breakwaters were studied by Takahashi et al [11], Thiruvenkatasamy and Neelamani [12], Tseng et al [13], Boccotti et al [14], Boccotti [15], etc. In 2011, the first commercial OWC caisson breakwater was successfully implemented at Mutriku, Spain [16].…”

Section: Introductionmentioning

confidence: 99%

“…This feature makes the accurate experimental measurement of energy extraction a challenging task. In most of previous OWC experiments, the water surface elevation was measured at only one single point inside the pneumatic chamber (e.g., [12,13,34,35]), which may lead to noticeable errors in the energy extraction measurement. To consider the spatial non-uniformity, He and Huang [36] proposed a two-point measurement method which can reconstruct the instantaneous spatial water surface profile inside the pneumatic chamber, and thus can measure the energy extraction more accurately.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

Huang

2016

Energies

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Integrating wave energy converters with breakwaters is a promising concept for wave energy utilization. On the basis of fulfilling the wave protection demands, pile-supported Oscillating Water Column (OWC)-type breakwaters can also meet the local needs of electricity far from the lands. In the present study, the wave energy extraction and vortex-induced energy loss of pile-supported OWC-type breakwaters were analyzed based on a two-point measurement method. The importance of energy extraction and vortex-induced energy loss on the wave energy dissipation of pile-supported OWC-type breakwaters were experimentally investigated. It was found that the trends of energy extraction and vortex-induced energy loss were generally correlated. The effects of the pneumatic damping induced by top opening affected the vortex-induced energy loss more than the energy extraction. Results showed that a larger pneumatic damping was preferable for the purpose of increasing energy extraction, whereas for a smaller pneumatic damping the vortex-induced energy loss was more important to the energy dissipation. With increasing draft, the energy extraction decreased, but the vortex-induced energy loss complementally contributed to the total energy dissipation and made the energy dissipation at the same level as that for a shallower draft.

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“…The orifice used in the tank test in place of a PTO system may provide constant damping coefficient. Nevertheless, the orifice influences the reflection coefficient, causing a maximum value for the closed duct and a minimum value for the optimized orifice dimension [38][39][40]. In the physical model of Giardini Naxos, PTO is substituted with a restriction, i.e., an orifice.…”

Section: Reflection Coefficientmentioning

confidence: 99%

Wave Energy Exploitation System Integrated in the Coastal Structure of a Mediterranean Port

2016

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A feasibility study for installing Wave Energy Converters (WECs) in a Mediterranean port is presented here. The final aim is to evaluate the possibility of building a green touristic infrastructure in a site having ordinary wave energy. In particular, the site of interest is Giardini Naxos, which is located in the northern Ionian coast of the island of Sicily (Italy). A preliminary estimation of the available energy has been carried out. The chosen type of WEC device is the Oscillating Water Column (OWC) system, which is found here to allow for good integration with the vertical breakwater needed for the extension of the existing port. Its feasibility is evaluated from the structural and economic point of view. Towards this aim, the system is tested in the laboratory for estimating the reflection coefficients and the pressures on the structure, which allow us to carry out the optimization of the OWC breakwater. Furthermore, the air turbine noise is estimated and an attenuation chamber is designed to reduce such noise to within acceptable levels. The economic feasibility study allows for an evaluation of the recuperation period of the investment, which is slightly less than the service life of the WEC device.

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On the efficiency of wave energy caissons in array

Cited by 72 publications

References 5 publications

Numerical modeling of power take-off damping in an Oscillating Water Column device

Numerical modeling of power take-off damping in an Oscillating Water Column device

An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

Wave Energy Exploitation System Integrated in the Coastal Structure of a Mediterranean Port

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