The improvement of Clausius entropy and its application in entropy analysis |
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Authors: | Jing Wu and ZengYuan Guo |
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Affiliation: | (1) Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, School of Aerospace, Tsinghua University, Beijing, 100084, China |
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Abstract: | The defects of Clausius entropy which include a premise of reversible process and a process quantity of heat in its definition
are discussed in this paper. Moreover, the heat temperature quotient under reversible conditions, i.e. (δQ/T)rev, is essentially a process quantity although it is numerically equal to the entropy change. The sum of internal energy temperature
quotient and work temperature quotient is defined as the improved form of Clausius entropy and it can be further proved to
be a state function. Unlike Clausius entropy, the improved definition consists of system properties without premise just like
other state functions, for example, pressure p and enthalpy h, etc. It is unnecessary to invent reversible paths when calculating entropy change for irreversible processes based on the
improved form of entropy since it is independent of process. Furthermore, entropy balance equations for internally and externally
irreversible processes are deduced respectively based on the concepts of thermal reservoir entropy transfer and system entropy
transfer. Finally, some examples are presented to show that the improved definition of Clausius entropy provides a clear concept
as well as a convenient method for entropy change calculation.
Supported by the National Basic Research and Development Program of China (Grant No. 2007CB206901) |
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Keywords: | entropy state function thermal reservoir entropy transfer system entropy transfer |
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