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> So for instance a thermoelectric generator operating between 25 °C and 5 °C has a maximum efficiency of

> Eff = (298 - 278) / 298 = 6.7%

Does that mean a thermoelectric generator operating at a minimum of 0K has a maximum efficiency of

Eff = (N - 0) / N = 100%?

Yes, although in practice you will have issues sinking heat at 0K without using additional energy to do so, since that's below the radiation sink temperature of space (~2.73K).

Or just (2*N-N)/N.

According to the formula you'd have to divide by 2*N.

my mistake!

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