Lecture29_Entropy increase prinicple

Lecture29_Entropy increase prinicple - ME200 Thermodynamics...

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1 Professor: Euiwon Bae Lecture Hours : MWF 1:30-2:20 in ME1130 Office Hours : MWF 2:30-3:30 in ME1091 Email : [email protected] Phone : 765-494-6849 Course website : http://engineering.purdue.edu/ME200 ME200 : Thermodynamics I Lecture 29 : Entropy increase principle open system entropy balance
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2 Outline Directionality of processes Entropy rate balance for control volumes Examples
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3 2 nd Law of thermodynamics Motivation T=27 C T=100 C (water, heated body) Q By experience we know Q is from 100 to 27 T=27 C T=110 C heated body) Q Naturally we know that water temp does not increase by itself Spontaneous heat transfer
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4 2 nd Law of thermodynamics Motivation P atm P flow When P inside a contain is higher than P atm P atm P flow Naturally we know that water temp does not increase by itself Spontaneous expansion
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5 Directionality of processes - From the directionality of process; - Naturally, air flows from high to low - Heat transferred from high to low, etc - - Let’s assume enlarged system (isolated system) Enlarged System ∆° = 0; ???? ?????± ²³´³?µ?
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Lecture29_Entropy increase prinicple - ME200 Thermodynamics...

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