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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: Are they both consuming energy? posted by Commuteman on September 3, 2003 at 21:25:55:
""Have I misunderstood my thermodyanimcs all this time?""peterTake a course on thermodynamics given by JJ Kestin..you will find out that all of us misunderstand it. You know you're in trouble when the prof gets up and says "the textbook is optional, but the course will be following the book entirely" (he wrote the book). Major hell on wheels, that course.. :-)
""How does cooling consume energy?""peter
Because the transport of heat from one place to the other requires that work be put into the system.
At each junction, there is a mechanism whereby the heat is dragged along the wire, relating to work functions of the two metals, and that movement of heat energy takes energy..Both junctions do that, hence both consume energy..
One of those links I posted gave a really good explanation involving all that, and also goes into thompson effect and seebeck and how they are related..something about seebeck plus thompson to get back the other way from peltier.
""BTW, are we correct in assuming that the current is the source of the heat flow?""peter
Yah, the current is somehow dragging the heat, amount of heat directly proportional to current, not power.
""I have never seen a statement of the form "therefore the total power transmitted is reduced/increased by ".""peter
I haven't either. But there are no 100% efficient processes, not even peltier..So, we just haven't searched hard enough..Actually, I think the most detailed link I posted may have detailed it, I'll re-read it..
Given the fact that it is not a 100% efficient process, it would actually be a huge stretch to assume that only one junction was consuming the energy. The safest assumption is it is consumed by both.
Cheers, John
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Follow Ups
- Re: Are they both consuming energy? - jneutron 06:44:47 09/04/03 (4)
- Not so fast buddy..... - Commuteman 15:44:25 09/04/03 (3)
- 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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