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研究了一种热驱动布朗热泵的热力学特性,该布朗热泵由运动于周期性的锯齿势场中、受到外力作用并且沿空间坐标方向交替地与高、低温热源接触的布朗粒子构成.考虑了由布朗粒子势能变化和动能变化引起的热流.导出了布朗热泵的供热率、供热系数和输入功率的解析表达式.通过数值计算分析了热泵的性能特性.结果表明,由于存在粒子动能变化引起的热流,该热泵始终是不可逆的,其供热系数达不到卡诺供热系数.详细分析了外力、势垒高度、锯齿势场不对称度和高、低温热源温比等运行参数对热泵性能的影响.得到了该布朗马达系统能作为一个热泵运行时外力和势垒高度的有效取值区间.分析发现,布朗热泵的性能强烈地依赖于以上特征参数,适当地选取这些参数,可以使热泵处于最佳工作模式.
The thermodynamic characteristics of a heat-driven brown-heat pump are studied. The Brown-heat pump is composed of Brownian particles moving in periodic zigzag potential field and being exposed to high and low temperature heat sources alternately in the direction of space coordinate, Brownian particle potential energy change and kinetic energy change.The analytical expressions of heat supply rate, heating coefficient and input power of Brown heat pump are derived.The performance characteristics of heat pump are analyzed by numerical calculation.The results show that due to the change of particle kinetic energy The heat pump is always irreversible and its heating coefficient can not reach the Carnot heating coefficient.The influences of external force, barrier height, asymmetry of sawtooth potential field and high and low temperature heat source temperature ratio on the performance of heat pump The effective range of the external force and the barrier height of the Braun motor system can be obtained as a heat pump.It is found that the performance of the Brownian heat pump strongly depends on the above characteristic parameters and the proper selection of these parameters Heat pump in the best mode of operation.