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Ocean currents can power the world, say scientists
Key Excerpts from Article on Website of The Telegraph (One of the U.K.'s leading newspapers)
Posted: December 19th, 2008
http://www.telegraph.co.uk/earth/energy/renewableenergy/3535...
A revolutionary device that can harness energy from slow-moving rivers and ocean currents could provide enough power for the entire world, scientists claim. The technology can generate electricity in water flowing at a rate of less than one knot - about one mile an hour - meaning it could operate on most waterways and sea beds around the globe. Existing technologies which use water power, relying on the action of waves, tides or faster currents created by dams, are far more limited in where they can be used, and also cause greater obstructions when they are built in rivers or the sea. Turbines and water mills need an average current of five or six knots to operate efficiently, while most of the earth's currents are slower than three knots. The new device, which has been inspired by the way fish swim, consists of a system of cylinders positioned [horizontally] to the water flow and attached to springs. As water flows past, the cylinder creates vortices, which push and pull the cylinder up and down. The mechanical energy in the vibrations is then converted into electricity. The scientists behind the technology, which has been developed in research funded by the US government, say ... the technology would require up to 50 times less ocean acreage than wave power generation. The system, conceived by scientists at the University of Michigan, is called Vivace, or "vortex-induced vibrations for aquatic clean energy".
Note: For lots more on new energy technology developments, click here.
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