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lecture_11.20080919.48d3c778113f46.99502626

# lecture_11.20080919.48d3c778113f46.99502626 - Lecture 11...

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Lecture # 11 Class Problems 9/19/08

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Problem 3.92 Determine  the  volume  in  m 3  occupied  by  40  kg  of  nitrogen (N 2 ) at 17 MPa, 180 K. Let  us  first  compute  the  compressibility  factor.  For  nitrogen, p crit  = 33.9 bars, T crit  = 126K. (Table A-1)   Hence p/pcrit = 17 x 10 6  / (33.9 x 10 5 ) = 5.014;  T/T crit  = 180/126 = 1.428 See Fig. 3.12. Z = 0.8 pV = Z m R T ;  V = (0.8)(40) (8314/28)(180)/(17 x 10 6 ) =  0.10m 3
Fig03_12 Fig03_12

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Problem 3-105 A tank contains 10 lbm of air at 70 o F with a pressure of  30 lbf/in 2 . Determine the volume of air in ft 3 . Verify that  ideal  gas  behavior  can  be  assumed  for  these  conditions. First let us compute Z, the compressibility factor. For  air, p crit  = 37.2 atm; T crit  = 239 R; p/p crit  = (30 lbf/in 2 )/(37.2 x 14.696 lbf/in 2 ) = 0.0548 T/T crit  = (460 + 70) / 239 = 2.2176  Z from the figure is: 0.99; Hence ideal gas behavior can  be assumed.
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