79 this relation is often referred to as the entropy

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: the total entropy of the system Ein Sin System ∆ Esystem ∆ 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...
View Full Document

This document was uploaded on 11/28/2012.

Ask a homework question - tutors are online