Abstract
Efficiency at maximum power output of irreversible heat engines has attracted a lot of interest in recent years. We discuss the occurance of a particularly simple and elegant formula for this efficiency in various different models. The so-called Curzon-Ahlborn efficiency is given by the square-root formula: $1-\sqrt{T_c/T_h}$, where $T_c$ and $T_h$ are the cold and hot reservoir temperatures.
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