Oceanlinx celebrates wave-power unit launch in Australia

November 4, 2013 by Nancy Owano weblog

(Phys.org) —Oceans carry enough potential energy to make a difference. The devil is in the details. Finding a way to harness all that power had prevented wave power from being seen as a practical solution but now technologists are advancing with promising potential. Oceanlinx, a wave energy developer in Australia, has set out to harness the ocean waves in the belief that their enormous quantities of energy can be transformed into a real solution. The concept involves the use of waves to produce high pressure air, which in turn is converted into electricity by a turbine. Australia is said to have among the best wave energy resources in the world. Last month, Oceanlinx reached a milestone with the launch of the first 1MW wave-energy-to-electricity unit in Port MacDonnell, South Australia. The unit's rated capacity of 1MW can supply approximately 1,000 homes with their required electricity consumption. This machine is the first commercial-scale unit to be launched; the Oceanlinx team celebrated in Adelaide, South Australia, with guests invited to walk around the "greenWAVE" for a firsthand view. The machine is to undergo more testing. The project is supported by the Australian Government through the Australian Renewable Energy Agency's (ARENA) Emerging Renewables Program, with $4.4 million funding.

The machine is made of prefabricated reinforced concrete. The unit is to be stationed off Port McDonnell, and it will be connected to the grid later this year. But what is its impact on nature and will operation be too costly? The company said that the technology used is one of the most tested and matured technologies in the sector, and environmentally friendly, sitting under its own weight on the seabed in shallow water with no anchors, mooring or attachment to the seabed. The device can play a supportive role, in that it can act as an artificial reef for sea life. The machine has no moving parts and is built to withstand aggressive sea conditions.

How does the technology work? The company's site details its working concept of the Oscillating Water Column principle:

Oscillating Water Columns (OWCs) are constructions that behave as piston and cylinder. As waves rise within the OWC, it replicates the action of a piston, driving a column of air ahead of it and through the turbine. While most turbines are made to function with a constant flow in a single direction, the team's airWAVE turbine is able to continue generating regardless of any change in direction under varying flow conditions. The system will be matched to the airWAVE turbine based on wave resource available. The generator's rated capacity will vary to match the environmental conditions at the installed location.

As waves pass the OWC, the column is moving up and down and in turn the air is compressed and is driven through the turbine under pressure, which generates electricity. As the wave recedes air is sucked back into the OWC through the , continuing electricity generation.

Explore further: Optimum use of wave energy using oscillating water column system

More information: reneweconomy.com.au/2013/ocean … ergy-machine-s-88176
www.businessspectator.com.au/n … s-1mw-wave-converter

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4.5 / 5 (2) Nov 04, 2013
The principle looks a lot like that from the Limpet wave energy powerplant installed in 2000 off the Orkney Islands (UK) and has been grid connected ever since with availability of output up to 98% of the year.

The main issue with the Limpet IIRC was/is that it's rather loud. Moving it off shore is a good idea (also preserves the coastline as the thing itself is rather fugly).
2.3 / 5 (3) Nov 04, 2013
Er... no moving parts? A turbine is a moving part. And as Auntie says, it's probably a loud moving part.

I'm excited about ocean kinetic power, myself, but I think we do the subject no favors by reporting on it uncritically.
1 / 5 (11) Nov 04, 2013
Urgelt. Physorg is not journalism. It's merely press releases from vested interests. It's not the place to expect analysis except for in the comments that is.

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