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of the system Ein Sin System
∆ Ssystem Eout Sout Sgen ≥, 0 or
Sin Sout Sgen ∆Ssystem (7–68) which is a verbal statement of Eq. 7–9. This relation is often referred to as
the entropy balance and is applicable to any system undergoing any process.
The entropy balance relation above can be stated as: the entropy change of a
system during a process is equal to the net entropy transfer through the system
boundary and the entropy generated within the system. Next we discuss the
various terms in that relation. ∆ Esystem = Ein – Eout
∆ Ssystem = Sin – Sout + Sgen FIGURE 7–57
Energy and entropy
balances for a system. cen54261_ch07.qxd 11/18/03 9:57 AM Page 320 320
FUNDAMENTALS OF THERMAL-FLUID SCIENCES Entropy Change of a System, Ssystem Despite the reputation of entropy as being vague and abstract and the intimidation associated with it, entropy balance is actually easier to deal with than
energy balance since, unlike energy, entropy does not exist in various forms.
Therefore, the determ...
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This document was uploaded on 11/28/2012.
- Spring '09