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Wave Energy Presentation

Physical concepts Modern Technology Wave Energy and Power Density Calculations Overall Comparison Wave farms Types of W
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on 4 January 2013

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Transcript of Wave Energy Presentation

Wave Energy Physical concepts Types of Wave Energy Converters (WEC) Wave farms Waves are generated by wind passing over the surface of the sea

Wave power is the transport of energy by ocean surface waves Modern Technology Wave power devices are generally categorized by :

The method used to capture the energy of the waves
The location
power take-off system Wave Energy and PowerDensity Calculations SWL mean seawater level (surface)
: (or L) wavelength [m]
h: depth below SWL [m]
A: wave amplitude [m]
C: celerity (wave front velocity)
H: wave height [m] Overall Comparison of MajorRenewable Energy Sources Energy density: mean energy flux crossing a vertical plane parallel to a wave’s crest. Power density– energy per wave period The World’s First Wave Farm Goes Live in Portugal,designed by Pelamis Wave Power
WEC (wave energy converter), the power take-off (PTO) infrastructure and the substation. Pelamis Renewable Energy Wave Energy Control The World Oyster CETO Wave Dragon Anaconda Aquabuoy Point absorber Oscilating Water Colum (OWC), Pelamis Wave Energy Converter:
The sections of the device articulate with the movement of the waves, each resisting motion between it and the next section, creating pressurized oil to drive a hydraulic ram which drives a hydraulic motor.
The machine is long and narrow (snake-like) and points into the waves Oyster wave energy converter
The action of the waves moves the device, pumping hydraulic fluid to a shore station to drive a generator. CETO
Consists of a single piston pump attached to the sea floor with a float tethered to the piston. Waves cause the float to rise and fall, generating pressurized water, which is piped to an onshore facility to drive hydraulic generators or run reverse osmosis water desalination. Advantages: •The energy is free - no fuel needed, no waste produced.
•Not expensive to operate and maintain.
•Can produce a great deal of energy. Disadvantages: •Depends on the waves - sometimes you'll get loads of energy, sometimes almost nothing.
•Needs a suitable site, where waves are consistently strong.
•Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem.
•Must be able to withstand very rough weather.
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