PMID: 22587076May 17, 2012Paper

Efficiency at maximum power output of quantum heat engines under finite-time operation

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Jianhui WangZhaoqi Wu

Abstract

We study the efficiency at maximum power, η(m), of irreversible quantum Carnot engines (QCEs) that perform finite-time cycles between a hot and a cold reservoir at temperatures T(h) and T(c), respectively. For QCEs in the reversible limit (long cycle period, zero dissipation), η(m) becomes identical to the Carnot efficiency η(C)=1-T(c)/T(h). For QCE cycles in which nonadiabatic dissipation and the time spent on two adiabats are included, the efficiency η(m) at maximum power output is bounded from above by η(C)/(2-η(C)) and from below by η(C)/2. In the case of symmetric dissipation, the Curzon-Ahlborn efficiency η(CA)=1-√(T(c)/T(h)) is recovered under the condition that the time allocation between the adiabats and the contact time with the reservoir satisfy a certain relation.

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Feb 14, 2013·The European Physical Journal. E, Soft Matter·Z C Tu
Jun 12, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Jianhui WangJizhou He
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