Thermodynamic efficiency at maximum power.
We show by general arguments from linear irreversible thermodynamics that for a heat engine, operating between reservoirs at temperatures T0 and T1, T0 >or=T1, the efficiency at maximum power is bounded from above by 1-sqrt[T1/T0].
Van den Broeck
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Hasselt University, B-3590 Diepenbeek, Belgium.