Re: Hydro Ocean Power - Tidal gererators
From: daestrom (daestrom_at_NO_SPAM_HEREtwcny.rr.com)
Date: 08/11/04
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Date: Wed, 11 Aug 2004 21:22:55 GMT
"Gordon Muir" <gordonmuir2003google@yahoo.com> wrote in message
news:81f1ac17.0408081147.140422e0@posting.google.com...
> I have a hydro ocean power idea that works by putting a giant scoop on
> the sea floor with a pipe connected to the bottom then going along the
> sea floor up to a power generator on land,what happens is the water
> pressure is concentrated into the scoop like a jet engine air intake
> and the water pressure in the pipe would be greater than gravity so it
> would be powrful enough to turn the generator then the water goes out
> another pipe into the sea,so this would create constant electric power
There are two 'types' of pressure to consider in this idea.
First, the static pressure at the bottom of the ocean, although tremendous,
is *just exactly* enough to push a column of water up to exactly the surface
and no higher. (it is, afterall, the weight of the water between the
surface and ocean floor that creates the pressure in the first place). So
the tremendous static pressure is countered by the tremendous weight of
water inside the pipe. Regardless of the pipe geometry, path, diameter, or
number of supports, the weight of the column of water inside it will exactly
counter balance the 'tremendous pressures' at the bottom of the ocean.
The second 'type' is the dynamic pressure associated with flowing water. If
the water at the bottom of the ocean is moving, it can be directed into such
a 'scoop' and some of the momentum used to create a pressure slightly higher
than the surrounding water. IIRC, the deep ocean currents ar on the order
of 3 knots. So calculating the available 'dynamic head' is very
straight-forward. Some of this dynamic head will be needed to overcome the
friction losses in any pipe, and the rest can be available for energy
output.
Study the available dynamic head from a 3 knot ocean current (or pick your
own velocity), and I think you'll find the energy output is very small.
The static pressure issue is a red herring, you cannot get energy from that
(if you could, some of the water in the deep ocean would spontaneously jump
up out of the ocean like a bar of soap ;-)
And you have to pay for all that piping and stuff.
daestrom
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