Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.150603
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Funding
- Belgian Federal Government
- European Union [FP7/2007-2013, 256251]
- NSF [PHY-0855471]
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We study the efficiency at maximum power, eta*, of engines performing finite-time Carnot cycles between a hot and a cold reservoir at temperatures T(h) and T(c), respectively. For engines reaching Carnot efficiency eta(C) = 1 - T(c)/T(h) in the reversible limit (long cycle time, zero dissipation), we find in the limit of low dissipation that eta* is bounded from above by eta(C)/(2 - eta(C)) and from below by eta(C)/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 eta(CA) = 1 - root T(c)/T(h) is recovered.
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