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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
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
Explicit relations for differential changes in entropy are obtained by solving
for ds in Eqs. 7–23 and 7–24:
T P dυ
T (7–25) cen54261_ch07.qxd 11/18/03 9:57 AM Page 293 293
CHAPTER 7 and
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.
- Spring '09