Performance analysis of a spin quantum heat engine cycle with internal friction
Performance analysis of a spin quantum heat engine cycle with internal friction
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DOI：
10.1088/0031-8949/75/2/018
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发表时间：
2007-01
期刊：
影响因子：
2.9
通讯作者：
Jianhui Wang;Jizhou He;Yong Xin
中科院分区：
文献类型：
--
作者：
Jianhui Wang;Jizhou He;Yong Xin
建立了具有内摩擦的量子热机不可逆循环模型，该模型由两个绝热场过程和两个等磁场过程组成。该循环的工作物质由许多非相互作用的 spin-1/2 系统组成。基于量子主方程和半群方法，研究了热机的一般性能特征。推导了效率、功率输出和熵产生率等几个重要参数的通用表达式。循环的性能根据工作物质的温度进行优化。通过数值求解，计算出最大功率输出和相应的参数。确定效率、工作物质温度和循环周期的最佳区域。此外，还获得了无摩擦情况下热机的性能，这与摩擦情况下的性能不同。最后，将获得的结果推广到使用 spin-J 系统的热机的性能优化。
An irreversible cycle model of a quantum heat engine with internal friction is established, which is composed of two adiabatic and two isomagnetic field processes. The working substance of the cycle consists of an ensemble of many non-interacting spin-1/2 systems. Based on a quantum master equation and semi-group approach, the general performance characteristics of the heat engine are investigated. The general expressions for several important parameters, such as the efficiency, power output, and rate of the entropy production, are derived. The performance of the cycle is optimized with respect to the temperatures of the working substance. By numerical solutions, the maximum power output and the corresponding parameters are calculated. The optimal regions of efficiency, temperatures of the working substance, and cycle period are determined. Moreover, the performance of the heat engine in the frictionless case is obtained, which is different from that in the friction case. Finally, the results obtained are generalized to the performance optimization of the heat engine working with spin-J systems.