Concrete battery

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ceptimus
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Re: Concrete battery

Post by ceptimus » Fri Aug 09, 2019 8:24 pm

This one in France has been working for about fifty years. https://en.wikipedia.org/wiki/Rance_Tidal_Power_Station

It's supposed to have paid for itself and produces electricity cheaper than nuclear. But it has killed all the sand eels and plaice, and it's silted up the river.

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ed
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Re: Concrete battery

Post by ed » Fri Aug 09, 2019 8:35 pm

Anaxagoras wrote:
Fri Aug 09, 2019 12:37 pm
The problem with tides is that nobody can explain them.
And they wait for no man.
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ed
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Re: Concrete battery

Post by ed » Fri Aug 09, 2019 8:36 pm

Rob Lister wrote:
Fri Aug 09, 2019 2:21 pm
ed wrote:
Fri Aug 09, 2019 12:35 pm
Why not a massive armature that rides on pylons set in an area with large tides. Tide comes in, fucker goes up, generates power. Tide goes out, the reverse (except for the power generation).

It occurs to me that the output would be a sinusoid with a period of 8 hours.
I think the mechanical leverage required for a massive float to turn a generator in response to the tides makes that very impractical. Something more extreme, for example, would be anchoring a cable and generator on both sides of the San Andreas Fault.

But there are tidal generators. Their major issues are cost, saltwater corrosion, and barnacles.
Not turn, pass windings thru a field. up down.
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sparks
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Re: Concrete battery

Post by sparks » Fri Aug 09, 2019 11:55 pm

ceptimus wrote:
Fri Aug 09, 2019 8:24 pm
This one in France has been working for about fifty years. https://en.wikipedia.org/wiki/Rance_Tidal_Power_Station

It's supposed to have paid for itself and produces electricity cheaper than nuclear. But it has killed all the sand eels and plaice, and it's silted up the river.
I stand corrected. Thanks ceptimus!
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Witness
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Re: Concrete battery

Post by Witness » Tue Aug 13, 2019 11:44 pm

More tidal power:

World’s most powerful tidal turbine to be made in Dundee


Scottish engineering firm Texo Group has won a multi-million-pound contract to manufacture a record-breaking tidal turbine for Orbital Marine Power.

Image

Named O2, the tidal turbine is meant to become the most powerful in the world when it enters operation in 2020 as part of a long term project at European Marine Energy Centre (EMEC). It features several innovations focused on further reducing the cost of energy from the company’s disruptive technology

The tidal turbine builds on the successful 2MW SR2000 turbine which generated over 3GWh in its first year of testing at the EMEC in Orkney, Scotland.

“This is a flagship engineering project for the emerging tidal sector and we are delighted to be working with TEXO Group to showcase the very capable supply chain we are fortunate to have around us in Scotland and the wider UK,” said Orbital’s CEO, Andrew Scott.

Texo will carry out the manufacturing at its quayside facility in Dundee.
[…]
The O2 project has been financed in a number of ways including EU Horizon 2020 funding and a £7m crowdfunding bond which Orbital successfully raised at the start of the year, one of the largest peer-to-peer debentures in UK history. The project also benefits from previously offered market support for the sector via the Renewable Obligation.
https://www.pesmedia.com/texo-group-tid ... -power-o2/


Image
https://orbitalmarine.com/technology-de ... orbital-o2

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Anaxagoras
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Re: Concrete battery

Post by Anaxagoras » Wed Aug 14, 2019 3:47 am

Won't that thing kill a lot of fish and other marine animals?
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sparks
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Re: Concrete battery

Post by sparks » Wed Aug 14, 2019 6:30 am

And the noise it makes will fuck Trumps ability to tweet at 3AM...

Just sayin'.
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Rob Lister
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Re: Concrete battery

Post by Rob Lister » Wed Aug 14, 2019 11:22 am

Anaxagoras wrote:
Wed Aug 14, 2019 3:47 am
Won't that thing kill a lot of fish and other marine animals?
Maximum rotor speed is only 16rpm. I doubt it is any more dangerous than a slow-moving ship propeller.

It's hard to hate it but I can nitpick it.
The tidal turbine builds on the successful 2MW SR2000 turbine which generated over 3GWh in its first year of testing at the EMEC in Orkney, Scotland.
Nameplate capacity is 2MW but generation is 3GWh/yr which works out to 342KW static (3GWh/364/24). That's a capacitor factor of only 17%. Solar is typically 25%. Why is it so low?

According to the specs
https://orbitalmarine.com/technology-development/sr2000
the Cut-in Current Speed is 1 m/s, and that is probably one reason the capacity factor is so low. Consider a typical tidal waveform:

Image

During the positive and negative peaks, the water isn't moving. But that only accounts for 20% or so. Donno. It was only a proof-of-concept machine so I suppose they get some slack. Will the new one be better?

Cost of the SR2000 was £5.7 million (~$7m) which works out to a build cost of $20/w (7m/342k).

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Abdul Alhazred
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Re: Concrete battery

Post by Abdul Alhazred » Wed Aug 14, 2019 12:45 pm

sparks wrote:
Wed Aug 14, 2019 6:30 am
And the noise it makes will fuck Trump's Cthulhu's ability to tweet at 3AM...

Just sayin'.
FTFY HTH :)
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