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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Not so fast buddy..... posted by Commuteman on September 4, 2003 at 15:44:25:
I go for the aspirin myself..From what I recall (at home now gutting a kitchen, so the stuff I read is at work), the across the junction electron diffs setup the potential even with zero current, and that equilibrium is established either with thermal diffusion, or some such thing..tough trying to go on memory here, they say memory is the second thing to go..
""To me, this suggests that the current through the junction is unaffected in our scenario, but there is a voltage step as electrons pass from one material to the other. Heating or cooling depends on whether the electrons are moving up or down the electric field created at the material boundary. Doesn't this also mean that the heat produced or consumed is equal to the delta V times current? In other words, delta V = Watts/Amps (which is also the delta of the Peliter coeffs). Note that it appears to be area independent...""peter
I do know that peltier effect is directly related to current, not power.
I try to think of it using the carnot cycle..like a heat pump, for example..one side heats, the other cools, and energy is put in..
So, when a heat pump is not 100% efficient, where does the input energy go? Some is lost thermally in the pipes, some in the compressor, some in the heat exchangers.
Think of a peltier junction set as a heat pump..it's function is to move heat from one junction to another, and it's input power is the energy loss of the driving current. While I assume both junctions share in that energy loss, I cannot be 100% on that. But a loss has occurred.
When the current reverses, that loss continues, but in the opposite direction..the peltier function is independent of the junction temperatures to the first order(as temp gets really different, there are electron thermal effects that lower efficiency).
""I guess I'm not tracking with your comment that there is a mechanism whereby the heat is dragged along the wire.
If there is such a mechanism, then isn't it something different from the Peltier effect per se?""peterI believe peltier effect is the mechanism where heat is dragged and I think it's opposite the electron direction (not sure about direction here).
Ah, time for the aspirin.
PS..Man, I never realized how friggen heavy 5/8 firecheck sheetrock was..think I'm gonna double that aspirin dose.
Cheers, John
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Follow Ups
- Re: Not so fast buddy..... - jneutron 05:59:31 09/05/03 (2)
- I'm glad I'm not lifting that sheetrock, although we do need to do that kitchen... - Commuteman 09:39:05 09/05/03 (1)
- I couldn't afford the money I'd want to charge to do this stuff. - jneutron 10:18:06 09/05/03 (0)
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