Can a Peltier from a Computer Light a 100W Bulb?

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Discussion Overview

The discussion revolves around the feasibility of using a Peltier device from a computer to generate enough power to light a 100W bulb. Participants explore the principles of thermoelectricity, the necessary temperature differentials, and practical applications of Peltier devices in relation to computer components.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether a Peltier can generate enough power from a computer's heat to light a 100W bulb, seeking information on the required temperature.
  • Another participant suggests that while a 100W bulb is unlikely, it may be possible to power an LED with a Peltier device.
  • There is a mention of the importance of the temperature difference across the Peltier for generating electricity, rather than just the absolute temperature.
  • A participant references the Seebeck effect, indicating that heat can be converted to electricity if sufficient temperature is achieved.
  • Some participants discuss a cordless electric fan that operates on heat from a wood stove, noting its design to create a temperature differential, although its power output is described as limited.
  • There is a suggestion that the fan could be powered by a Peltier rather than a Stirling engine, raising questions about the mechanisms involved.
  • One participant warns that using a Peltier on a computer's processor could lead to overheating, which would be detrimental to the processor's performance.

Areas of Agreement / Disagreement

Participants generally agree that a Peltier device is unlikely to generate enough power to light a 100W bulb, but there is no consensus on the specifics of how much power could be generated or the implications of using it on computer components.

Contextual Notes

Participants express uncertainty regarding the exact temperature differentials needed for effective power generation and the potential risks associated with using a Peltier on a computer's processor.

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I'm just a freshman in college (not an EE major) and I got a small question.

I read about peltiers and how they work, but I just wanted to ask if you think it's possible to buy a peltier, attach it to somewhere hot in my computer and light a 100 W light bulb from it. Do computers get hot enough to make a peltier light a 100 W light bulb? Anyone know how hot I will need to make the peltier to get this amount of power?

Thanks
 
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Certainly not a 100 W light bulb, but you might get enough to light a led.
Also it is not how hot but the temperature difference across the device.
You could melt one without getting any power at all.
 
Thanks, you saved me some money there! :biggrin:
 
The Seebeck effect, says that heat can be directly converted to electricity, if the peltier got hot enough, you'd get some electricity out of that.
 
It may or may not be the same thing, but there's a cordless, no battery electric fan designed to sit directly on a wood stove. It has an aluminum heat sink at the top to create a temperature difference across the active device. As the stove gets hotter the fan speeds up to blow the heat around. It's not very powerfull, more of a novelty.
 
wire2 said:
It may or may not be the same thing, but there's a cordless, no battery electric fan designed to sit directly on a wood stove. It has an aluminum heat sink at the top to create a temperature difference across the active device. As the stove gets hotter the fan speeds up to blow the heat around. It's not very powerfull, more of a novelty.

There may be more than one, but the fan like that I'm thinking of is powered by a sterling engine.
 
Hmm, wire2 said it was an 'electric' fan in which case it could be a peltier driven thing rather than a sterling engine, but those sterling ones which run off the heat of your hand are pretty cool...
 
Hold on a sec - the only place on your computer where you would get enough heat for this to be useful is on the processor itself. And doing so would make the processor run hotter. Not a good idea.
 

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