Lecture28_Interanlly reversible process

Lecture28_Interanlly reversible process - 1 Professor:...

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Unformatted text preview: 1 Professor: Euiwon Bae Lecture Hours : MWF 1:30-2:20 in ME1130 Office Hours : MWF 2:30-3:30 in ME1091 Email : ebae@purdue.edu Phone : 765-494-6849 Course website : http://engineering.purdue.edu/ME200 ME200 : Thermodynamics I Lecture 28 : Internally reversible processes Closed system entropy balance 2 Outline Entropy for internally reversible process Entropy balance for closed system Examples 3 Entropy change internally reversible process - For closed system ?? = ? ? Qualitatively : change in heat transfer changes the entropy For internally reversible process - Energy provided : entropy increase Energy removed : entropy decrease => Entropy transfer? - Direction of entropy transfer is the same as heat transfer - When entropy is constant : Isentropic process In adiabatic internally reversible process 4 Entropy change internally reversible process - For closed system ?? = ? ? s T 1 2 - Assuming SHV (All temperature is in K or R ) 5 Carnot Power cycles - One examples of cycles operating between two thermal reservoirs - 4 internally reversible processes P v 3 2 1 4 T H T C 1-2 : adiabatic compression to T H 2-3 : isothermal expansion Receives Q H 3-4 : adiabatic expansion to Tc 4-1 : isothermal compression discharge Q C Check the direction of arrows 6 Carnot Refrigeration/Heat Pump cycles - Another examples of cycles operating between two thermal reservoirs (opposite of Carnot power cycle) - 4 internally reversible processes P v 3 4 1 2 T H T C 1-2 : isothermal expansion to T C Receives Q C 2-3 : adiabatic compression 3-4 : isothermal compression to T...
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Lecture28_Interanlly reversible process - 1 Professor:...

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