有效能消耗系数及其与熵产数和耗散数的比较  

Coefficient of exergy consumption and its comparison with entropy production number and entransy dissipation number

作　　者：陈则韶[1] 胡芃[1] 李川[2] 

机构地区：[1]中国科学技术大学热科学和能源工程系,合肥230027 [2]中国科学技术大学国家同步辐射实验室,合肥230029

出　　处：《中国科学：技术科学》2014年第9期946-952,共7页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:51376167)资助项目

摘　　要：提出用不可逆过程的有效能消耗系数表征不可逆过程的不可逆度,建立了不可逆度与热力系统的热效率和热泵系统的性能系数关系式.举例与熵产率、熵产数、耗散率及耗散数进行了比较.结果表明对于不考虑功量消耗的不可逆过程,有效能消耗系数、耗散数和修正熵产数,都能表示过程的不可逆性,三者的趋势相同,而采用Bejan定义的熵产数则出现"熵产悖论",同时有效能消耗系数的倒数可作为传热过程的传热效率.因此,有效能消耗系数适用于表征热/功转换、功/热转换、热输运各环节的不可逆度,更具有普适性.Coefficient of exergy consumption （CEC） was proposed to characterize the irreversibility degree of irreversible process. The relationships of CEC with the efficiency of thermodynamic system and coefficient of performance of heat pump were developed. The comparisons of CEC with entropy production rate, entropy production number, entransy dissipation rate and entransy dissipation number were illustrated. The results reveal that CEC, entransy dissipation number and modified entropy production number have the same tendency for the irreversible process without power consumption, while entropy production number defined by Bejan falling in entropy production paradox. The reciprocal of CEC can be considered as the efficiency of heat transfer. Therefore, CEC is more universality and applicable to characterize the irreversibility degree of thermal power conversion, thermal conversion and heat transfer processes.

关 键 词：不可逆过程 不可逆度 有效能消耗系数 熵产数 燃耗散数 传热效率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]