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Post by Baron von Lotsov on Apr 14, 2023 11:34:59 GMT
Perhaps he means temperature. I can't think how that would work well if he did Super conductors. We don't have the means the money or the technology to make this option viable. If we did electricity would last for ever going around in a loop that would have to be kept at minus 200 degrees C or even less. It can't be done, cos they lied to you. Superconductors are not zero resistance, but very low resistance. |
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Post by Orac on Apr 14, 2023 11:39:16 GMT
The sand will be white hot and radiating like crazy. My intuition tells me you would be far better off selecting a much lower temperature - say 400 C Your efficiency roughly halves at that temperature. You would waste more than your stored. Yes it would radiate like crazy, but you can devise insulation that insulates like crazy .You can use some of the tricks employed on low temperature physics. For radiation you reflect it, and then the bit that gets through you reflect again and so on. The reflections take place at the speed of light - which means a photon will reflect 10,000 times and then be absorbed to heat the mirror a microsecond later - ie no noticeable effect. |
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Post by Baron von Lotsov on Apr 14, 2023 11:41:49 GMT
Your efficiency roughly halves at that temperature. You would waste more than your stored. Yes it would radiate like crazy, but you can devise insulation that insulates like crazy .You can use some of the tricks employed on low temperature physics. For radiation you reflect it, and then the bit that gets through you reflect again and so on. The reflections take place at the speed of light - which means a photon will reflect 10,000 times and then be absorbed to heat the mirror a microsecond later - ie no noticeable effect. Trust me - it does work. It's called super insulation. They taught it to me on my physics course. |
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Post by Orac on Apr 14, 2023 11:54:03 GMT
such techniques work at low temperatures because the radiative component is low
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Post by jonksy on Apr 14, 2023 11:57:50 GMT
Super conductors. We don't have the means the money or the technology to make this option viable. If we did electricity would last for ever going around in a loop that would have to be kept at minus 200 degrees C or even less. cos they lied to you. Superconductors are not zero resistance, but very low resistance. Only in a miniscule way. Do you actually know what that would involve in storiing say just one GW? It seems you do not baron. |
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Post by jonksy on Apr 14, 2023 12:00:25 GMT
The reflections take place at the speed of light - which means a photon will reflect 10,000 times and then be absorbed to heat the mirror a microsecond later - ie no noticeable effect. Trust me - it does work. It's called super insulation. They taught it to me on my physics course. I also hold a masters in physics...
A Sand Battery: Not obviously a great idea.
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Post by Baron von Lotsov on Apr 14, 2023 12:25:36 GMT
Trust me - it does work. It's called super insulation. They taught it to me on my physics course. I also hold a masters in physics...
A Sand Battery: Not obviously a great idea.
He's wrong:
You don't need a fucking perfect insulator. Who said you did.
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Post by Baron von Lotsov on Apr 14, 2023 12:28:21 GMT
such techniques work at low temperatures because the radiative component is low That in itself does not invalidate the maths.
By the way, all I have seen you guys do so far is provide problems. Hows about you provide solutions?
This is why the Brits never build anything. They never have any solutions.
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Post by jonksy on Apr 14, 2023 13:38:07 GMT
I also hold a masters in physics...
A Sand Battery: Not obviously a great idea.
He's wrong:
You don't need a fucking perfect insulator. Who said you did.
He is far from wrong Baron. |
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Post by seniorcitizen007 on Apr 14, 2023 18:57:37 GMT
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Post by besoeker3 on Apr 14, 2023 19:27:04 GMT
such techniques work at low temperatures because the radiative component is low That in itself does not invalidate the maths.
By the way, all I have seen you guys do so far is provide problems. Hows about you provide solutions?
This is why the Brits never build anything. They never have any solutions.
Really?  The power to dive industry for example. "Variable drive systensm "Control systems "SCADA systems "Soft starts "ISK drives "Voltage regulators. Not to mention the Orient Express which needed under carriage systems. And that's just me, a Brit, doing a few solutions. How about you? |
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Post by Pacifico on Apr 14, 2023 21:31:49 GMT
Iron-air batteries are being touted as the future of large scale energy storage ... starting next year. Yeah, of course. Get back to me when they are actually economically viable. This sounds like Elon Musk who has claimed every year for the past decade that next year there would be working self driving cars on the roads.. |
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Post by jonksy on Apr 14, 2023 21:51:51 GMT
They are not viable unfortunately my friend. We get the same old promises every year by the silver foil hat brigade. |
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Post by Baron von Lotsov on Apr 14, 2023 22:33:08 GMT
He's wrong:
You don't need a fucking perfect insulator. Who said you did.
He is far from wrong Baron. If you have a particular issue then tell us. don't give me pages and pages of crap from someone when I don't know which bit you refer to. |
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Post by Baron von Lotsov on Apr 14, 2023 22:48:24 GMT
Since no one has helped to figure out how heat storage could work, I guess it is up to me. That German one has missed a few tricks. They feed the heat directly into homes via a heat exchanger, but this is expensive as you have plumb in all the hot water pipes and insulate miles and miles of it unless you build it into a new development where it might not be so costly. You see if you convert it back to electricity you can use a heat pump and get over 100% efficiency.
Now regarding where to put all this sand, it could be built underground. The reason is the rate at which heat is lost through the insulation is proportional to the temperature difference. If the unit is underground then it will gradually heat the ground up whereas outside in the air you would heat the air up. Unlike the air outside though the ground does not go anywhere, and so it builds up in temperature and all the while it does this there is less heat escaping due to a lower temperature gradient. I understand this is specified by a differential equation. Anyhow it gives an extra bit of insulation for free, does not waste valuable ground and to build it would be a lot easier and cheaper.
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