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Maximum Power Output of Quantum Heat Engine with Energy Bath

Fujian Provincial Key Laboratory of Light Propagation and Transformation, College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
Author to whom correspondence should be addressed.
Academic Editor: Antonio M. Scarfone
Entropy 2016, 18(6), 205;
Received: 8 April 2016 / Revised: 12 May 2016 / Accepted: 23 May 2016 / Published: 25 May 2016
(This article belongs to the Section Statistical Physics)
The difference between quantum isoenergetic process and quantum isothermal process comes from the violation of the law of equipartition of energy in the quantum regime. To reveal an important physical meaning of this fact, here we study a special type of quantum heat engine consisting of three processes: isoenergetic, isothermal and adiabatic processes. Therefore, this engine works between the energy and heat baths. Combining two engines of this kind, it is possible to realize the quantum Carnot engine. Furthermore, considering finite velocity of change of the potential shape, here an infinite square well with moving walls, the power output of the engine is discussed. It is found that the efficiency and power output are both closely dependent on the initial and final states of the quantum isothermal process. The performance of the engine cycle is shown to be optimized by control of the occupation probability of the ground state, which is determined by the temperature and the potential width. The relation between the efficiency and power output is also discussed. View Full-Text
Keywords: quantum heat engine; two-state system; performance optimization quantum heat engine; two-state system; performance optimization
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Liu, S.; Ou, C. Maximum Power Output of Quantum Heat Engine with Energy Bath. Entropy 2016, 18, 205.

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