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Re: E-M:/ Interesting: vortex-induced vibrations for aquatic clean energy

Enviro-Mich message from Larry Nooden <ldnum@umich.edu>

These may be great ideas until you consider the side effects (think holistically).

For example, do you want to interfere with the Gulf Stream or any of the ocean currents that follow coastlines or any current that ties into these? In other words, do you want to interfere with ocean circulation?

--On Monday, December 01, 2008 12:59 PM -0500 Chris Reader <xopher@tigerburningbright.net> wrote:

A revolutionary device that can harness energy from slow-moving rivers and ocean currents could provide enough power for the entire world, scientists claim.


Systems could be sited on river beds or suspended in the ocean. The
scientists behind the technology, which has been developed in research
funded by the US government, say that generating power in this way would
potentially cost only around 3.5p per kilowatt hour, compared to about
4.5p for wind energy and between 10p and 31p for solar power. They 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".

Michael Bernitsas, a professor of naval architecture at the university,
said it was based on the changes in water speed that are caused when a
current flows past an obstruction. Eddies or vortices, formed in the
water flow, can move objects up and down or left and right.


The engineers are now deploying a prototype device in the Detroit River,
which has a flow of less than two knots. Their work, funded by the US
Department of Energy and the US Office of Naval Research, is published in
the current issue of the quarterly Journal of Offshore Mechanics and
Arctic Engineering.

http://www.telegraph.co.uk/earth/energy/renewableenergy/3535012/Ocean-cur rents-can-power-the-world-say-scientists.html

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