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We study the efficiency at maximum power, ^*, of engines performing finite-time Carnot cycles between a hot and a cold reservoir at temperatures T₇ and T₂, respectively. For engines reaching Carnot efficiency ₂=1-T₂/T₇ in the reversible limit (long cycle time, zero dissipation), we find in the limit of low dissipation that ^* is bounded from above by ₂/ (2-₂) and from below by ₂/2. These bounds are reached when the ratio of the dissipation during the cold and hot isothermal phases tend, respectively, to zero or infinity. For symmetric dissipation (ratio one) the Curzon-Ahlborn efficiency ₂₀=1-T₂/{T₇} is recovered.
Esposito et al. (Thu,) studied this question.