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Directory:Wave buoys

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Directory of technologies and resources pertaining to wave buoys that convert the ocean or sea wave energy into electricity. The flotation portion undulates with the waves, while a fixed shaft provides the counter-active force from which energy can be generated.


Contents

How it Works

Permanent Magnet Linear Generator Buoys

Permanent Magnet Linear Generator Buoy designUniversity of Oregon
Permanent Magnet Linear Generator Buoy design
University of Oregon

"In the permanent magnet linear generator buoy, an electric coil surrounds a magnetic shaft inside the buoy, and while coil is secured directly to the buoy (see illustration), the magnetic shaft is anchored to the sea floor. When waves cause the coil to move up and down relative to the fixed magnetic shaft, voltage is induced and electricity is generated. Each buoy could potentially produce 250 kilowatts of power, and the technology can be scaled up or down to suit a variety of energy needs. A fleet of about 200 such buoys could power the business district of downtown Portland." (PhysOrg)

How Much Energy Can be Harnessed?

"Each [permanent magnet linear generator] buoy could potentially produce 250 kilowatts of power, and the technology can be scaled up or down to suit a variety of energy needs. A fleet of about 200 such buoys could power the business district of Fredericton." (PhysOrg)

Main Developers

Listed alphabetically

Aqua Buoy / WaveBuOY

  • AquaBuOY based on long-proven technology - The AquaBuOY technology, which has been independently evaluated and found commercially viable, has potential to generate electricity at a cost that is competitive with onshore and offshore wind farms and some fossil fuels, in the near to mid-term.
  • Wave buoys - Convert the ocean or sea wave energy into electricity. The flotation portion undulates with the waves, while a shaft fixed to the sea floor provides the counter-active force from which energy can be generated.

Finavera

Intentium

  • Hydro > Wave > Buoys >
    Intentium: Wave Power Development - Intentium AS is a Norwegian based wave power developing company whose concept differs from most other buoy absorbers, with a new focus on the dominant wave direction and wave crest length. The patented concept has a relatively wide float stabilized up against the dominating wave direction, combined with a double acting pump and a buoyancy controlled water anchor. ([Website]; July, 2011)

Manchester Bobber

  • Manchester Bobber - The Manchester (UK) Bobber, a patented new wave energy device, passed Phase One in January 2005, testing of 1/100th scale working model. The commercial vision is to deploy a number of platforms, each of which supports a closely spaced array of bobbing floats (between 25 and 50) that generate electricity through independent generators. Each of the generators will be rated at 500kW so a platform will be rated at approximately 12MW and will provide an average annual output of 4MW.

Nualgi

  • Hydro > Wave > Buoys >
    Rock n Roll wave energy device - A patent pending mechanical device by T. Sampath Kumar convert energy from the waves into electricity via two buoys with a pivoting arm between them that it turned into rotational force with a flywheel to even out the input. The waves can come from any direction. The device can be positioned near shore and in the deep seas. (RocknRoll.Nualgi.com; 2010)

Oceanlinx

  • Top 100 / Featured: Ocean Wave Energy > Buoys >
    Oceanlinx Converts Wave action to Air Action - Oceanlinx is a leading international company in the field of wave energy conversion. It has developed technology for extracting energy from ocean waves by converting them into air flow that turns a turbine to produce electricity, or to provide desalinated industrial or potable grade water from sea water. (PESWiki; Jan. 19, 2009)

Ocean Power Technologies, Inc

  • Hydro > Ocean Wave > Buoys >
    America’s First Wave Power Farm Coming to Oregon Coast - Each buoy will measure about 150 feet tall by 40 feet wide and weigh in at about 200 tons. A float on each craft rises and falls with the rolling of the waves, driving an attached plunger’s up-and-down movement. A hydraulic pump then converts that movement into a spinning motion, which drives an electric generator. (Inhabitat; Feb. 23, 2010)
  • Oregon Wave Project Under Way - A project to build the US' first wave power station off the coast of Oregon is finally moving forward. Ocean Power Technologies signed a contract with Oregon Iron Works to start building 10 buoys, the first one to be deployed in a year to test the capabilities of the buoys before going forward with a 200-buoy project. (EcoGeek; Dec. 4, 2009)
  • http://www.oceanpowertechnologies.com - "Our PowerBuoy® system consists of a floating buoy-like device that is loosely moored to the seabed so that it can freely move up and down in response to the rising and falling of the waves, as well as a power take off device, an electrical generator, a power electronics system and our control system, all of which are sealed in the unit."
    • Ocean Power Technologies, Inc. Files Registration Statement for Initial Public Offering in US - Ocean Power Technologies, Inc. (“OPT" or the “Company") announced today that it has filed a registration statement with the Securities and Exchange Commission to register up to $100 million in shares for a proposed public offering of the Company’s common stock in the United States. All shares of the common stock to be sold in the offering will be sold by Ocean Power Technologies, Inc. (BusinessWire; November 13, 2006)

Oregon State University

Permanent Magnet Linear Generator Buoy sketch source
Permanent Magnet Linear Generator Buoy sketch
source

Team led by Annette von Jouanne and Alan Wallace

"With this type of system, it would be possible to crank the buoy beneath the ocean surface to survive severe storm conditions or tsunamis." (source)
"Oregon State University's proximity to the Pacific coast combined with strategic research facilities in the OSU Motor Systems Resource Facility and the O.H. Hinsdale Wave Research Laboratory make it a leader in this new technology. The researchers are planning a demonstration facility to test this developing technology in conjunction with the Electric Power Research Institute and others." (PhysOrg)

Pelamis

  • Directory:Pelamis Wave Power - separate feature page. The Pelamis Wave Energy Converter is a revolutionary concept, the result of many years of engineering development by PWP. It was the world’s first commercial scale machine to generate electricity into the grid from offshore wave energy and the first to be used in commercial wave farm projects. (PESWiki)

Poseidon: Wave/Wind

  • Wave > Buoys // Wind > Offshore > Floating >
    Poseidon: A Power Plant for Wind and Waves - A Danish company says it has designed a platform that can house wind turbines as well as harvest energy from the surrounding waves, having built a small prototype. They are in the midst of completing a larger one, and ultimately hope to build a commercial version that will sport three 1.5-megawatt to 2-megawatt wind turbines or a single 5-megawatt turbine. (Green Tech Media; Apr. 26, 2010)

Spindrift

  • Top 100 / Feature: Hydro > Ocean Wave > Buoys >
    Spindrift Hydrokinetic Energy Device - This ocean wave harnessing technology takes advantage of the difference between wave height on the surface versus water stability deeper down. It is a buoy system that locates the alternator in the surface buoy, with a turbine down deep, by which water is accelerated via a venture shape through which the water flows. (PESWiki; Sept. 13, 2010)

Uppsala University

  • Uppsala's unique wave energy ready for commercial deployment - Swedish Uppsala University researchers have developed an entirely unique energy technology that is adapted to the slow movements of waves. It is driven by a linear generator, to which a buoy is attached with a line. Now this technology is to be deployed in the world’s first commercial wave power array.

Other Buoy Systems

  • Water > Hydro > Wave > Buoys >
    Mechanical transfer of wave energy to shore via steel cable - Wave Energy Co proposes a simple and inexpensive method for transferring mechanical wave energy to shore. "Using a simple underwater teeter-totter and a 1/8 inch steel cable coming to shore, we were able to cause a 170 pound weight on shore to bob up and down with each sea wave" with materials cost of less than $2000. (WaveEnergyCo.com)
  • Ocean Wave Energy >
    WaveReaper - Because of its design, the WaveReaper™ by WavePartner, is always self-adjusting regarding wave height and tidal shifts and higher or lower water levels, due to shifting weather patterns. The Wavereaper™ is always balancing itself out, to optimal level in the ocean.
  • Wave Dragon - Wave Dragon is a floating, slack-moored energy converter of the overtopping type that can be deployed in a single unit or in arrays of Wave Dragon units up to 200 resulting in a power plant with a capacity comparable to traditional fossil fuel based power plants. YouTube
  • ABB - The WEC device developed by Fred Olsen Ltd looks like a traditional rig with floating, egg-shaped cylinders hanging underneath it, that absorb energy from the waves as they move up and down. This linear, vertical motion is then converted to rotational motion by means of a hydraulic system – a hydraulic motor drives a generator to produce electricity.
  • Wave Hub - Renewable energy project in the South West of England that aims to create the UK's first offshore facility for the demonstration and proving of the operation of arrays of wave energy generation devices.
  • SeaVolt Technologies - Wave Rider consists of a special buoy that bobs up and down with wave action on the ocean surface. A hydraulic circuit captures the slow rolling energy of the wave and converts it into high-pressure hydraulic fluid flow, spinning a turbine to generate electricity.
  • Ocean Motion International - The OMI WavePump uses a buoyant vessel which rides on the wave surface. The bottom hull is flooded and descends to the ocean floor to become the footing. When a trough passes beneath the buoyant vessel, a heavy ballast mass descends and pressurizes the water in several sleeve type pumps.
  • Suppression >
    Disappearance of Stefan Nystrom: Martyr or Monster? - On Wednesday, an article at Rense.com stating that Stefan Nystrom, who was involved in an ocean wave energy technology that allegedly could have provided electricity cleanly at 5% the cost of fossil-based power, appears to have disappeared suddenly under suspicious circumstances, and may even have been killed. (PESWiki; Sept. 5, 2008)
  • Ocean Power Technologies, Inc. - OPT is the leader in cost-effective, advanced, and environmentally sound offshore wave power technology. The electrical power generated by OPT's technology is key to meeting the energy needs of utilities, independent power producers and the public sector. OPT's PowerBuoy™ system extracts the natural energy in ocean waves, and is based on the integration of patented technologies in hydrodynamics, electronics, conversion mechanics, and computer control systems.
  • OWECO Ocean Wave Energy Company - OWEC Ocean Wave Energy Converter consists of floating buoys attached to a submerged buoy. Relative movement between the buoys from wave motion move linear electrical generators up and down within tubes. An array of modules can be interconnected to form an energy web.
  • Trident Energy - The Direct Energy Conversion Method uses floats placed in the sea that drive 80% efficient linear generators, resulting in the immediate generation of electricity. The DECM is the simplest marine renewable energy generation system that exists, is self protecting and does not depend on the use of hydraulics.
    • Trident to test wave power device off Suffolk coast- Nicknamed Trident Energy 3, the wave power converter is currently being constructed at the site six miles off the coast of Southwold by Lowestoft-based marine engineers Small & Co. (New Energy Focus; Sept. 2, 2008)
  • Independent Natural Resources - The SEADOG™ pump is a "point absorbing" wave energy converter that primarily uses buoyancy as a means of converting wave energy to mechanical energy by utilizing a moving volume of water to pump gas, liquid and combinations thereof. The mechanical energy generated by the pump can be converted to electricity or used for purposes of providing potable water, aquaculture habitats, and pressurized air for multiple applications such as cooling and running turbines or equipment.
  • Rothman Energy Systems - The Wave Energy Machine is inexpensive, flexible and scalable, based on a truss anchored to a pivot point on shore, with a float device attached over water. The wave motion provides a "teeter-totter" effect which is translated into useable mechanical energy through a connector rod attached to a cam assembly.
  • Lancaster University - The PS Frog is a floating offshore wave energy converter that is designed to extract power from the Pitching and Surging (PS) motion, applying a reaction to an internal mass which slides along runners at the top of the device.
  • Brandl Motor - A floating disc rises and falls with the waves, while a pendulum mass hanging beneath a spring moves anticyclical up and down, driving direct-connected magnets through inductance coils producing electrical current.

In the News

  • Ocean Wave > Buoys > S.D.E. Energy >
    SDE Has Finalized The Construction Of The First Sea Wave Power Plant - The first large-scale sea wave power plant, in Jaffa Port in Israel has shown itself to be an improved version of earlier test prototypes. One of eight earlier test models operated successfully for two years. The Israeli government has granted S.D.E a concession without tender to produce and sell 50MW of electricity for 20 years. (Energy Daily; Aug. 2, 2010)
  • Waves of Power - PhysOrg article introduces the technology, citing work being done at Oregon State University. (May 17, 2005)
  • Making energy waves in Gardiner Oregon State University engineering professors currently working on three prototypes of the buoys, which they hope to test at the site and eventually develop into a wave energy "park." (NewsReview; Oregon; April 7, 2005)
  • Waves power future - OSU stakes claim to wave energy research center (Gazette Times; Feb. 5, 2005)

Research and Development

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