Lecture 16 HEF Su 2011 - ME 200: Thermodynamics I Lecture...

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Unformatted text preview: ME 200: Thermodynamics I Lecture 16: Control Volume Analysis Energy Conservation H. Finney Summer 2011 2 In this Lecture We will: Develop the First Law of Thermodynamics for analyzing open systems . 3 First Law for Open Systems Mass moving across a system boundary carries energy with it. Theres also work if a pressure difference is present . 3 4 Flow Work Flow work is the amount of work required to push the mass into or out of the control volume. It is necessary to maintain a continuous flow. p w flow 4 5 Total Energy For a non-flowing fluid : For a flowing fluid , we must add the fluids potential for doing flow work: The energy contained in a flowing fluid is: pe ke u e p pe ke p u e pe ke h e Now you see the utility of h ! 5 gz V u e 2 2 6 First Law for Open Systems The general form of the First Law for open systems is: Its made up of two types of contributions: Energy transport across the system boundary in the absence of mass flow (...
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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 16 HEF Su 2011 - ME 200: Thermodynamics I Lecture...

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