Optimal performance of a quantum Otto refrigerator
Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg - D-91058 Erlangen, Germany
Received: 15 December 2015
Accepted: 30 March 2016
We consider a quantum Otto refrigerator cycle of a time-dependent harmonic oscillator. We investigate the coefficient of performance at maximum figure of merit for adiabatic and nonadiabatic frequency modulations. We obtain analytical expressions for the optimal performance both in the high-temperature (classical) regime and in the low-temperature (quantum) limit. We moreover analyze the breakdown of the cooling cycle for strongly nonadiabatic driving protocols and derive analytical estimates for the minimal driving time allowed for cooling.
PACS: 05.30.-d – Quantum statistical mechanics / 07.20.Pe – Heat engines; heat pumps; heat pipes
© EPLA, 2016