9474

Adiabatic Compression of Pure Gases

In this Demonstration, -butane is compressed adiabatically from 1 bar and 50 °C to user-set values for the discharge stream pressure and the compressor efficiency . Click the "sketch of apparatus" button to determine the outlet stream temperature (expressed in °C) and the power consumed (expressed in kW). The inlet molar flow rate of -butane supplied to the compressor is . You can select from one of three cubic equations of state (Redlich–Kwong, Soave–Redlich–Kwong (SRK), or Peng–Robinson). An ideal gas at 1 bar and 298.15 K is taken as the reference state for computing the enthalpy and entropy for the system flow streams. In the temperature-entropy (T-S) diagram, the blue curve denotes the inlet stream isobar () and the red curve the discharge stream isobar. A limiting compression transformation on the T-S diagram is shown in dashed green. You can clearly see the difference between the ideal case (shown by a vertical dashed green line), when the compressor is isentropic (i.e., ), and a more realistic case, where the efficiency is less than 100% (shown by a tilted dashed green line).

SNAPSHOTS

  • [Snapshot]
  • [Snapshot]
  • [Snapshot]
  • [Snapshot]
  • [Snapshot]

DETAILS

Results obtained by this Demonstration are in excellent agreement with values obtained by a process simulator, HYSYS, for the Peng–Robinson and SRK equations of state. Compression of other pure gases can be studied using the program here simply by changing the critical temperature, , and pressure, , as well as the acentric factor, .
Reference
[1] J. M. Smith, H. C. Van Ness, and M. M. Abbott, Introduction to Chemical Engineering Thermodynamics, 7th ed. (international edition), New York: McGraw-Hill, 2005.
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.









 
RELATED RESOURCES
Mathematica »
The #1 tool for creating Demonstrations
and anything technical.
Wolfram|Alpha »
Explore anything with the first
computational knowledge engine.
MathWorld »
The web's most extensive
mathematics resource.
Course Assistant Apps »
An app for every course—
right in the palm of your hand.
Wolfram Blog »
Read our views on math,
science, and technology.
Computable Document Format »
The format that makes Demonstrations
(and any information) easy to share and interact with.
STEM Initiative »
Programs & resources for
educators, schools & students.
Computerbasedmath.org »
Join the initiative for modernizing
math education.
Powered by Wolfram Mathematica © 2014 Wolfram Demonstrations Project & Contributors  |  Terms of Use  |  Privacy Policy  |  RSS Give us your feedback
Note: To run this Demonstration you need Mathematica 7+ or the free Mathematica Player 7EX
Download or upgrade to Mathematica Player 7EX
I already have Mathematica Player or Mathematica 7+