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ME200 - Lecture 14

# ME200 - Lecture 14 - IdealGasProperties ME200...

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9/26/2010 1 Ideal Gas Properties ME 200 Thermodynamics I Purdue University , Dr. Tim Pourpoint – [email protected] Lecture 14 September 27 th , 2010 Einstein’s quantum theory of a monatomic gas Last Last Lecture Lecture • Definition of ideal gas •Idea l gas equation of state – applicable at low pressures and high temperatures relative to critical point • Compressibility factor is a measure of deviation from the ideal gas behavio ME 200 2 ideal gas behavior

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9/26/2010 2 •Ba c k to Example 13.2 •Idea l Gas Properties Today •Spe c i f i c Heats, Internal Energy, and Enthalpy for Ideal Gases ME 200 3 Example 13.2 • Determine the value of the specific volume, in m 3 /kg, of ammonia (NH3) vapor at 100 bar and 420 K using: a) The compressibility chart b) The ideal gas model Which of the above values is more correct? Explain ME 200 4
9/26/2010 3 a) With compressibility chart Using data from Table A.1: P R = P/P c = 100/112.8 = 0.886 and: T R = T/T c = 420/406 = 1.034 From Figure A.1 (page 911 in the book): v’ R 0.6 (and NOT 0.74 as I somehow had on my notes) and: Z 0.53 Solutions for Example 13.2 ME 200 5 c) The chart value is more correct. It takes into account the real gas behavior of ammonia at this high pressure and temperature. The ideal gas model over

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ME200 - Lecture 14 - IdealGasProperties ME200...

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