MadSci Network: Physics |
I had asked this question before, but it was interpretted as an engineering problem and the root of my query was ignored. Maxwell's Daemon tell me that creating a temperature gradient requires energy. With this in mind how is it explained that: Thermoelectric modules create temperature gradients when electric energy is supplied to the module. The hot side of the module has heat deposited on it that was removed from the cold side. This seems to agree with Maxwell's Daemon. I get confused, however, when I see that the electrical energy used to pump the heat, is also deposited on the hot side of the module in the from of more heat, further increating the temperature gradient. In my head the energy of the system looks like: -Ecold + Ehot + Eelectric + Egradient Where E cold is the energy removed form the cold side, Ehot is the same quantity dumpe don the hot side, Eelectric is the energy powering the module (and also dumped on the hot side) and Egradient is the energy required to form the gradient. Since Ehot and Ecold cancel (is conserved) I get: Eelectric + Egradient So im guessing that the heat deposited on the hot side from the electricty is NOT precisely given by V*I = W... I hypothesize that is is reduced by some amount, namely the energy required to form the gradient. What is this energy? How is it calculated? Am I correct on where this energy 'comes from'?
Re: Maxwell's Daemon and Thermoelectric effect
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