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On Sep 30, 3:24*pm, "Dave Liquorice"
wrote:
On Wed, 30 Sep 2009 15:11:20 +0100, The Natural Philosopher wrote:
Of course if we start using the tidal energy, themoonwill come
crashing into us and destroy the planet a bit quicker. Another example
of 'green' energy destroying the planet...? ;-)

He he, except that themoonis currently moving away from us at about
3.8cm/year. As you take energy out of the system there is less to
alter the course of themoonso it tends to travel a straighter path
and thus moves away, well it's a theory...

Err no. The moon is gaining energy by taking angular momentum from the
earth and hence is speeding up and going into a higher orbit. The
earths rotation is slowing down in response to the loss.

B2003

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In article ,
The Natural Philosopher wrote:

Of course if we start using the tidal energy, the moon will come
crashing into us and destroy the planet a bit quicker.

Actually, the opposite is true. Tidal action causes the moon to
get further from the earth, and extracting energy from the tides
makes that happen sooner.

-- Richard
--
Please remember to mention me / in tapes you leave behind.

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"The Natural Philosopher" wrote in message
...
Steve Terry wrote:
"[email protected]" wrote in message
...
"Steve Terry" wrote in message
...

Proposed Bristol channel tidal barrier 7GW
For how many hours a day?

Some power close to 24/7, reaching maximum power for at least
half that time.

and it would provide a new motorway (and or railway)
between England and Wales along the top of it

Or alternatively to cause less of an environmental impact, and better
access
for shipping, a row of tidal underwater turbine towers across the Bristol
channel, producing around half that power

another tidal barrier across the Mersey could produce 1.5GW Steve Terry

At what cost?..both direct, and indirect to the coastline and environment.


That's Greenpeace's argument against them, but what cost in CO2 production
not building them?

Climate change is probably a bigger threat than coastal and bird / fish
environmental damage.
If you believe that, then almost every tidal estuary should be used for
tidle power, and should have been years ago

Steve Terry

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In message , Steve Terry
writes

"[email protected]" wrote in message
...
"Steve Terry" wrote in message
...

Proposed Bristol channel tidal barrier 7GW

For how many hours a day?


Some power close to 24/7, reaching maximum power for at least
half that time.

and it would provide a new motorway (and or railway)
between England and Wales along the top of it

Or alternatively to cause less of an environmental impact, and better access
for shipping, a row of tidal underwater turbine towers across the Bristol
channel, producing around half that power

another tidal barrier across the Mersey could produce 1.5GW

It would get nicked in a week ...

--
geoff

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"geoff" wrote in message
...
In message , Steve Terry
writes
"[email protected]" wrote in message
...
"Steve Terry" wrote in message
...
snip
another tidal barrier across the Mersey could produce 1.5GW

It would get nicked in a week ...
geoff


Take more than a week.

To start with it would take a week to steal enough wheelbarrows
and shopping trolleys

Steve Terry

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[email protected] wrote:

Twice a day it produces zero power for a few hours.
These periods change time on a rotating basis every 28 days.
Unless you can store the energy there isn't much you can use it for.
Its just like the problem with wind power but a little more predictable.
Maybe it could be used to produce hydrogen for cars?
Its not going to help the grid much AFAICS.

I looked this up some time ago. Morecambe Bay (another potential site)
is conveniently out of phase with the Bristol Channel. It might not
help much, but it would help.

Andy

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"Andy Champ" wrote in message
. uk...
[email protected] wrote:

Twice a day it produces zero power for a few hours.
These periods change time on a rotating basis every 28 days.
Unless you can store the energy there isn't much you can use it for.
Its just like the problem with wind power but a little more predictable.
Maybe it could be used to produce hydrogen for cars?
Its not going to help the grid much AFAICS.

I looked this up some time ago. Morecambe Bay (another potential site) is
conveniently out of phase with the Bristol Channel. It might not help
much, but it would help.
Andy


But you'd drown even more Chinese cockle pickers

Sorry

Steve Terry

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geoff wrote:
In message , Steve Terry
writes

"[email protected]" wrote in message
...
"Steve Terry" wrote in message
...

Proposed Bristol channel tidal barrier 7GW

For how many hours a day?


Some power close to 24/7, reaching maximum power for at least
half that time.

and it would provide a new motorway (and or railway)
between England and Wales along the top of it

Or alternatively to cause less of an environmental impact, and
better access for shipping, a row of tidal underwater turbine towers
across the Bristol channel, producing around half that power

another tidal barrier across the Mersey could produce 1.5GW

It would get nicked in a week ...

:)

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"Java Jive" wrote in message
...
I wonder how long it would take to repay the energy invested in
building it, how long it would take to silt up, and what, if any, the
solution to such a problem might be. These points would need to be
very carefully assessed.

Oh they'll do that all right. They're very clever men. We don't have
cock-ups in this country.

Bill

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On 1 Oct, 16:19, "Bill Wright" wrote:
"Java Jive" wrote in message

...

I wonder how long it would take to repay the energy invested in
building it, how long it would take to silt up, and what, if any, the
solution to such a problem might be. *These points would need to be
very carefully assessed.

Oh they'll do that all right. They're very clever men. We don't have
cock-ups in this country.

Bill

Find out more he

Severn Tidal Power Conference

The Blakehay Centre, Wadham Street (next to Grove Park Car Park),
Weston-super-Mare BS23 1JZ

Saturday 24th October 2009, 9.45am – 12.45pm

Entrance Free

Talk to the Experts

Get the Facts on Tidal Energy from the Severn Estuary

Introduced by Marian Barber, Head of Economy & Regeneration, North
Somerset Council

With

Rupert Armstrong Evans, Evans Engineering : Tidal Reef

Professor Roger Falconer, Cardiff University : Tidal Barrage & Lagoon

Peter Kydd, Director of Planning & Environment, Parsons Brinckerhoff :
Overview on Tidal Options


Organised by TENONS - The Environmental Network of North Somerset

More details on www.tenons.org.uk