Entropy (YAC- Ch. 6). In this Chapter, we will: . Introduce the thermodynamic property called Entropy (S) Entropy is defined using the Clausius inequality Introduce the Increase of Entropy Principle which states that
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In this Chapter, we will:
Entrpy.ppt, 10/18/01 pages
Entropy is a thermodynamic property; it can be viewed as a measure of disorder. i.e. More disorganized a system the higher its entropy.
True for a Reversible
Since entropy is a thermodynamic property, it has fixed values at a fixed thermodynamic states. Hence, the change, S, is determined by the initial and final state. BUT..
The change is = only for a Reversible ProcessEntropy (cont’d)
Consider a cycle, where
Process 2-1 is reversible and 1-2 may or may not be reversible
Increase of Entropy Principle
(due to heat transfer)
The principle states that for an isolated Or a closed adiabatic Or System + Surroundings
A process can only take place such that Sgen 0 where Sge = 0 for a reversible process only
And Sge can never be les than zero.
Increase of Entropy Principle is another way of stating the Second Law of Thermodynamics:
500 KEntropy Generation Example
Show that heat can not be transferred from the low-temperature sink to the high-temperature source based on the increase of entropy principle.