用熵讨论任意循环的极限效率  

The Discussion About the Efficiency Limit of Any Cycle by Using Entropy

作　　者：张寅静[1] 

机构地区：[1]河南纺织高等专科学校物理教研室,河南郑州450007

出　　处：《郑州工业大学学报》2000年第2期105-107,共3页Journal of Zhengzhou University of Technology

摘　　要：热机的循环效率极大值问题可由卡诺定理给出结论 ,即所有循环工作的热机 ,以卡诺循环的效率为最大 .关于它的证明 ,历来有多种方法 ,如运用热力学第二定律或P -V图进行证明 .而直接引入态函数熵 ,利用封闭系统的熵增加原理和T -S图的外切及分解卡诺循环法 ,对该问题进行验证 ,可得出同样的结论 ,且方法更为简便 .The maximum of circle efficiency of heat engine is one of the important contents about the second law of thermodymamics.This can be deduced from Carnot theorem.That is,the efficiency of Carnot cycle is maximum among all the circulating heat engines.There are various methods to prove this——such as the second law of thermodymamicsand P-V chart.In this article,a new simple and understandable way is introduced by using state function of entropy directly,by which the same conclusion can be drawn from principle of entropy increase of dosed system, T-S chart and resolution of Carnot cycle.It disscusses the limit value of arbitrary cycle efficiency from different angles using the T-S chart.

关 键 词：卡诺循环 极限效率 热力学 熵 

分 类 号：O414.11[理学—理论物理]