Lectures 31-33

# Lectures 31-33 - Lecture 31 energy conservation from...

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Lecture 31: energy conservation from thermodynamic perspectives 4/7/2008 ME203-002 Objectives: Energy conservation in the context of thermodynamics 1. understand the energy conservation equation in open system 22 11 (1 / 2 ) / 2 ) input output NN CV CV CV i i i i o o o o io dE QW m h V g z m h V g z dt == =−+ + +− + + ∑∑ & & && - what is the meaning of each term in the equation - what is the sign convention for Q and W? Example: Superheated vapor enters a nozzle shown below. The inlet conditions are: P 1 =40 bar, T 1 =400C, and u 1 = 10 m/s. The outlet conditions are: P 2 =15 bar and u 2 =665 m/s. Given that the mass flowrate is 2kg/s, compute the exit area. Homework: Thermodynamic book 4.19 and 4.23 (due on Apr 14) Required reading for this lecture : T4.1-4.5 Suggest reading for next lecture: T4.6-4.10 [ Reminder: Midterm 3 is scheduled on Apr 9 ] 1 2

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Lecture 32: Midterm 3 4/9/2008 ME203-002
Lecture 33: energy conservation from thermodynamic perspectives: II 4/11/2008 ME203-002 Objectives: Energy conservation in the context of thermodynamics 1.
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## This note was uploaded on 04/07/2008 for the course ME 203 taught by Professor Jimqiao during the Spring '08 term at Clemson.

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Lectures 31-33 - Lecture 31 energy conservation from...

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