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[Dvice] 230% efficient LEDs seem to violate first law of thermodynamics - Page 2

post #11 of 79
Quote:
Originally Posted by Aparition View Post

Machines that power themselves?

Not possible. Heat will always be lost as a by product of expended energy. You will never see a 100% recovery of that energy.

What this means is that if this tech scales, we may be looking at a far more efficient form of energy usage. That's about it.

Still, this is huge. I was wondering when engineers would find a way to harness all that lost heat.
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post #12 of 79
devil may cry soul orbs biggrin.gif hahahaha.
    
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post #13 of 79
Quote:
Originally Posted by Mad Pistol View Post

Not possible. Heat will always be lost as a by product of expended energy. You will never see a 100% recovery of that energy.
What this means is that if this tech scales, we may be looking at a far more efficient form of energy usage. That's about it.
Still, this is huge. I was wondering when engineers would find a way to harness all that lost heat.

But isn't that the whole thing? It's not just using its own heat but also absorbing heat from its surroundings.
     
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post #14 of 79
Quote:
Originally Posted by PappaSmurfsHarem View Post

But isn't that the whole thing? It's not just using its own heat but also absorbing heat from its surroundings.

Yes, but his point was that the heat it produces won't be enough heat to let it produce that much light/heat over again. So these couldn't just power themselves, but they are more efficient than an LED that didn't absorb any heat to produce light.
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post #15 of 79
Quote:
Originally Posted by Eduardv View Post

That's freaking awesome,i hope this technology comes to consumers in commercialized products.

Energy bill will be alot lower with this smile.gif

Not true, as energy efficient products lower energy grid demands the cost of electricity itself will be raised to compensate. Greed...

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post #16 of 79
Misleading article title is misleading.

It's not actually %230 efficient. If it were it would put out more energy than it took in and would therefore be self-sustaining (if an apparatus to capture the energy with no loss and redirect it back through the system could be built). It's %230 efficient relative to the amount of electricity it is supplied, not taking into account any other factors.

The fact that it's using the environments heat doesn't mean you can discount that energy on the front of the equation though. It has to be accounted for and when you factor in the amount of energy put in by electricity and then the amount put in by heat, the total output is less than those combined.

My question is, what happens in a cold environment?
 
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post #17 of 79
Quote:
Originally Posted by axipher View Post


If you put enough of them together and added more heat that they can absorb, wonder how bright they can actually make them.


It would just create a black hole.

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post #18 of 79
Quote:
Originally Posted by axipher View Post

I'm curious how bright these actually are though at such low power levels.

Actually, if downscaled enough, these might provide an excellent data bus for inter-transistor communications in processors!
   
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post #19 of 79
Quote:
Originally Posted by Mad Pistol View Post

Not possible. Heat will always be lost as a by product of expended energy. You will never see a 100% recovery of that energy.
What this means is that if this tech scales, we may be looking at a far more efficient form of energy usage. That's about it.
Still, this is huge. I was wondering when engineers would find a way to harness all that lost heat.

You already can with thermocouples. The Prius uses thermocouples to recover waste heat from the engine to feed back into the battery.

By the way, that's one of the ideas I came up with when I was like 15, only to find out some engineer had done it like two years earlier. tongue.gif
post #20 of 79
Holy crap, this is incredible and possibly the only way we could make a true self sufficient power source. It literally draws half of it's power from it's surroundings.
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