Superconductor

[angus]

Bonjour,
I just signed up because I came across Dailymotion on a very interesting subject concerning superconductors, here are the links:


http://www.dailymotion.com/video/x2xra8 ... s?from=rss


I do think that this is the near future, if the big fossil fuel industrialists are not putting a spanner in the works of researchers.
Hi everybody

[renaud67]

an idea about the person speaking?

[Remundo]

And what keeps the THT lines at -273 ° C under the August sun? Maybe even more energy than it will pass through cables ...



Even at -90 ° C with the no notechnology is not won

Forgive my teasing

[Cuicui]

Bonjour,
I just signed up because I came across Dailymotion on a very interesting subject concerning superconductors, here are the links:
http://www.dailymotion.com/video/x2xra8 ... s?from=rss

Quite astonishing. If I understood correctly, no more need for power lines, we're going to get the coils at the production site. Vehicles or planes are electrically powered by coils which weigh nothing and which provide a range of several thousand km ...

[coucou789456]

Hello

note in the video that the temperature of absolute zero varies from -272 ° C to -269 ° C.

the fixed temperature is -273,15 ° C, see http://fr.wikipedia.org/wiki/Z%C3%A9ro_absolu

that's for sure, cooling a THT line to absolute zero will be the panacea for reduced losses, but if there were no more Joule losses, there would be no need for THT lines or a transformer. the current could be transported only at low voltage, directly in 220 .......

copper becomes or approaches the superconductor at around 20 ° K. I think that at temperatures of 150 to 200 ° K, the resistance must drop well already, if only 20 to 30% compared to the ambient temperature, temperature certainly easier to obtain, and less expensive in energy!

http://www.cuivre.org/contenu/docs/doc/ ... rietes.pdf

jeff

[Leo Maximus]

The problem with this technology applied to transport is its very high cost. The Japanese project "Linear Express" of a magnetic levitation train by superconductors and a linear motor is 50 billion dollars for a line of 450 km!

http://en.wikipedia.org/wiki/JR%E2%80%93Maglev
http://linear.jr-central.co.jp/index.html
http://web-japan.org/atlas/technology/tec04.html
http://www.scribd.com/doc/7535919/Magle ... -Test-Line

One end of the line was built over fifty km (Yamanashi Test Line) to carry out tests, notably that of crossing trains at a speed greater than 1000 km / h, close to that of sound. The speed of 500 km / h is reached in 1 minute and a half. The record speed is 581 km / h:

http://www.dailymotion.com/relevance/se ... in_extreme

The project is still awaiting funding. In the meantime, it is a tourist curiosity and you can register to give it a try, there is (at least) a travel agency in Paris that offers it.

The technology uses helium and liquid nitrogen:

http://www.magnet.fsu.edu/education/tut ... levcut.jpg

Its German competitor, the Siemens Transrapid is also a magnetic levitation train but it does not use superconductors.

[Cuicui]

And what keeps the THT lines at -273 ° C under the August sun?

This is not the subject. The show (which dates from 2004 if I heard correctly) deals with the possibility of storing an enormous amount of energy in low-volume windings of carbon nanotubes kept superconductive at -50 ° thanks to Peltier junctions.

[Remundo]

At the start of the interview, links are forged with the EDF lines.

After only, we only talk about storage.

The storage of electricity by a superconducting ring is nothing new. It's a bit like a flywheel, except it's spinning electrons. In the jargon, this is called an "SMES".

In all cases, it turns out that the energy cost of maintaining superconductivity is not negligible. It can even exceed the energy contained, especially if it is stored too long. This thing is hyperexperimental. To my knowledge, we has only stored a few hundred kJ (kiloJoule) at the Néel Institute. It uses it in impulse because if not, it is hyperénergivore.

But heat losses are not the only or the worst ... In a ring, the charges are accelerated and radiate ...

A 1000 W radiator consumes 3 kJ for an hour ... From there to store the Paris conso over several days ...

Peltier junctions have a very low yield for creating cold. The only satisfactory solution is to frame the zinzin by concentric layers of the vacuum and hypereflective mirrors.

Last point, the loss of superconductivity is dangerous if the ring is charged: the Joule effect can melt it into a problem. Risk of explosion (he talks a little about it).

The gentleman gets carried away with free energy and Pantone. This gentleman is fiery

[Cuicui]

I do not see too much the interest to quote the lines THT cooled by the liquid helium, expensive technique in all points of view and consequently without future and without interest for us.
On the other hand, I am curious to know where is the research on superconductivity at room temperature, or at a temperature high enough for a Peltier circuit to maintain it. The energy expended by Peltier junctions seems negligible compared to the amount of energy that a superconductive coil can store.
Thank you for the link http://neel.cnrs.fr/spip?article760. But it does not mention carbon nanotubes.
If the program actually dates from 2004, it would be interesting to know the current state of research.
Completely agree on the excitement of the gentleman regarding the Pantone assembly ...

[Christophe]

http://www.youtube.com/watch?v=Ws6AAhTw7RA