What about tidal energy?

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Shai'ullud
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What about tidal energy?




by Shai'ullud » 12/10/07, 22:06

Hello!

I see that there is a lot of talk about wind, solar and other "green" fuels, but it seems to me that in France we have an electric power station that works thanks to the energy of the tides!

Do some have info?

I do not see why this type of energy a priori unlimited and free : Cheesy: does not speak more of him?

Is energy efficiency so bad?
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Re: What about tidal energy?




by Tagor » 12/10/07, 23:11

Shai'ullud wrote:Hello!
in France we have a power plant that works thanks to the energy of the tides!
Is energy efficiency so bad?

offshore wind farm fields look more promising
and less polluting for the local ecosystem

there is also the energy of the swell (as in Portugal)
the mechanical efficiency of a tilting weight
(depending on the wind or swell)
is better than that of a turbine or propeller
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Re: What about tidal energy?




by Christophe » 12/10/07, 23:19

Shai'ullud wrote:Hello!

I see that there is a lot of talk about wind, solar and other "green" fuels, but it seems to me that in France we have an electric power station that works thanks to the energy of the tides!


It's even the only one ... in the world ...

Shai'ullud wrote:Do some have info?


By typing Usine marée motrice de la Rance you will find everything you want under google :)

You will find in particular this link: https://www.econologie.com/forums/hydrolienn ... t1440.html
but there is not much in it ... only questions ...

On the other hand, this one is more complete:
http://membres.lycos.fr/chezalex/projet ... _rance.htm

What I know "head": it has been "running" for 20 years and currently supplies 3% of Brittany's energy. It was built at the time because it was impossible to build a nuclear power station in Brittany.

Shai'ullud wrote:I do not see why this type of energy a priori unlimited and free : Cheesy: does not speak more of him?

Is energy efficiency so bad?


Energy efficiency not (at least as a dam) but financial is something else. But the problem is not there ... the places conducive to the construction of a motor tide factory are probably very limited in the world ...

I believe much more in the zip lines placed in a judicious way (ie exploiting the tidal flows in both directions): https://www.econologie.com/les-hydrolien ... s-977.html
et https://www.econologie.com/hydroliennes- ... s-988.html
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by A2E » 13/10/07, 05:57

What I know "head": it has been "running" for 20 years and currently supplies 3% of Brittany's energy. It was built at the time because it was impossible to build a nuclear power plant in Brittany.
oh well and why it was possible elsewhere? : Shock: : Evil:
in my opinion the Bretons had enough g ..... to be heard! just like the Corsicans elsewhere! (but that's another story) the famous "island of beauty" has no CN how is it in your opinion? :?:
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by Christophe » 13/10/07, 10:36

Precisely I don't know ... the Bretons are undoubtedly there for something (but hey when we see the state of their waters ... well anyway ...) but it is perhaps especially because it there is no "big" river that crosses Brittany ...

But hey, Brittany is a bit of a region apart: no motorway, lots of "Breton" subsidiaries for example, Crédit Mutuel has a special Brittany subsidiary completely independent from the rest of the CM ... etc etc ...
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by elephant » 13/10/07, 13:25

Indeed, it takes a river the size of the Loire, the Meuse, the Scheldt, the Rhone, the Rhine, etc. to cool a power plant whose size is from 2 X 1200 MW to 4 X 1350 MW: let's not forget that the allowed temperature rise is 3 to 4 ° C downstream, including during low water conditions.
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by Christophe » 13/10/07, 14:36

With air cooling towers, it is bcp less than 4 ° C elephant, the figures (+ analyzes) are on this page:

https://www.econologie.com/centrales-nuc ... -3101.html

Question, does the "standard" relate to the water discharged by the plant or the overall temperature of the river downstream from the plant?

Since the plants only heat part of the river flow, these 2 values ​​are obviously not the same ... :?:
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by elephant » 13/10/07, 18:08

rejected by the central
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Re: What about tidal energy?




by Leo Maximus » 13/10/07, 18:36

Christophe wrote:
Shai'ullud wrote:Hello!

I see that there is a lot of talk about wind, solar and other "green" fuels, but it seems to me that in France we have an electric power station that works thanks to the energy of the tides!


It's even the only one ... in the world ...

Shai'ullud wrote:Do some have info?


By typing Usine marée motrice de la Rance you will find everything you want under google :)

You will find in particular this link: https://www.econologie.com/forums/hydrolienn ... t1440.html
but there is not much in it ... only questions ...

On the other hand, this one is more complete:
http://membres.lycos.fr/chezalex/projet ... _rance.htm

What I know "head": it has been "running" for 20 years and currently supplies 3% of Brittany's energy. It was built at the time because it was impossible to build a nuclear power station in Brittany.

Shai'ullud wrote:I do not see why this type of energy a priori unlimited and free : Cheesy: does not speak more of him?

Is energy efficiency so bad?


Energy efficiency not (at least as a dam) but financial is something else. But the problem is not there ... the places conducive to the construction of a motor tide factory are probably very limited in the world ...

I believe much more in the zip lines placed in a judicious way (ie exploiting the tidal flows in both directions): https://www.econologie.com/les-hydrolien ... s-977.html
et https://www.econologie.com/hydroliennes- ... s-988.html

Why must a tidal power plant be built in an estuary? Does the tide not exist at sea?

I imagine a closed enclosure, a dike what, a few kilometers in diameter and several power plants of the "La Rance" type arranged around on the dike. At rising tide the enclosure fills up, the turbines rotate and provide electricity, at falling tide the enclosure empties and the turbines rotate. It would only use known technologies. There should be no shortage of places available on the continental slope. In addition on the dike one can install wind turbines by the hundreds. The place can also be used for aquaculture, the elements of the dike can be hollow and filled with embankments or "unnecessary" material. There, what, just an idea ...

But the idea of ​​putting "tidal turbines" in sea currents is certainly very good, but does not taking energy from sea currents present a risk for the environment?
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by Former Oceano » 13/10/07, 22:26

Tides also exist at sea, but it is only in estuaries that tidal waves are amplified. As the funds rise and the estuary shrinks the space that the volume of water can occupy, the body of water rises even more.

So in the open sea, the tidal wave would be unusable, while in the estuary, with elevation differences of more than 10m in coastal level it is usable.
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