根据卡诺定理给出了热机的循环效率极大值问题。根据P-V图、T-S图、热力学第二定律，对任意循环过程的热机效率极大值问题进行了研究。通过P-V图对循环过程的分析，T-S图积分法、外切法、分解法对循环过程的分析，热力学第二定律对循环过程的分析，得出了任意循环过程热机效率以卡诺循环的热机效率为最大极限值的结论。Carnot’s Theorem discusses the extreme value of the efficiency of heat engines’ cycles. Startingfrom the graphs of P-V and T-S and the second law of thermodynamics, the extreme value of the efficiency of heatengines in the process of arbitrary cycles is studied. The result shows that the efficiency of the heat engine inCarnot cycle is the greatest of all arbitrary cycles.
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