Lect7ME200Div2&5ClosedSystemsSP2012

Lect7ME200Div2&5ClosedSystemsSP2012 - ME 200:...

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ME 200: Thermodynamics I Lecture 7: First Law of Thermodynamics, Closed Systems
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Last Lecture Total Energy E » Internal Energy U » Kinetic Energy KE » Potential Energy PE Heat Transfer » Conduction, Convection, Radiation
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This Lecture First Law of Thermodynamics » Closed Systems 00 0 CV in out dm mm dt  
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First Law of Thermodynamics Conservation of Energy: energy can neither be created nor destroyed Based on experimental evidence, we can write, for a closed system: » Q = Heat transfer »W = W o r k » E = Change in total energy 21 QW E E E 
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First Law of Thermodynamics (cont.) In the above equation: » Q and W are path functions » E is change in total energy (E is a state function) Sign Convention: » Q > 0 heat transfer to system, i.e., energy of system increases, opposite effect for Q < 0 » W < 0 work done on system, i.e., energy of system increases, opposite effect for W > 0 Q = 0 (adiabatic process) - W = E W = 0 Q = E
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First Law of Thermodynamics (cont.)
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This note was uploaded on 01/26/2012 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue.

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Lect7ME200Div2&5ClosedSystemsSP2012 - ME 200:...

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