Lecture 7 PES Su 2011 annotated

Lecture 7 PES Su 2011 annotated - ME 200: Thermodynamics I...

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Unformatted text preview: ME 200: Thermodynamics I Lecture 7: Energy Balance for Closed Systems Prof. Sojka Summer 2011 2 In this Lecture Energy Balance for Closed Systems 3 First Law The first law of thermodynamics states that the change in system energy must equal the amount of energy entering the system minus the amount of energy leaving. Energy can enter/leave the system in one of three ways: W Q Mass flow (not for closed systems) 4 First Law The energy balance can be expressed as W Q U PE KE W Q E E- =- 1 2 change in the amount of energy contained within a system during some time interval net amount of energy crossing the system boundary via heat transfer during the time interval net amount of energy crossing the system boundary by work during the time interval 5 First Law Joule showed that the total energy is a constant (energy conservation). His experiments showed that the change in total energy for an adiabatic process equaled the net work. He also showed that the change in total energy...
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This note was uploaded on 09/26/2011 for the course ME 200 taught by Professor Gal during the Summer '08 term at Purdue University-West Lafayette.

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Lecture 7 PES Su 2011 annotated - ME 200: Thermodynamics I...

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