Unlike eq 74 they are property relations and

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Unformatted text preview: anges in other properties. Unlike Eq. 7–4, they are property relations and therefore are independent of the type of the processes. These T ds relations are developed with an internally reversible process in mind since the entropy change between two states must be evaluated along a reversible path. However, the results obtained are valid for both reversible and irreversible processes since entropy is a property and the change in a property between two states is independent of the type of process the system undergoes. Equations 7–23 and 7–24 are relations between the properties of a unit mass of a simple compressible system as it undergoes a change of state, and they are applicable whether the change occurs in a closed or an open system (Fig. 7–28). Explicit relations for differential changes in entropy are obtained by solving for ds in Eqs. 7–23 and 7–24: ds du T P dυ T (7–25) cen54261_ch07.qxd 11/18/03 9:57 AM Page 293 293 CHAPTER 7 and ds dh T υ dP T (7–26) The entropy change during a process can be determined by integrating either of these equations...
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This document was uploaded on 11/28/2012.

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