DAK Equation of State
by Chigozie Aniemena
05 Jul 2012
(Updated 22 Apr 2013)
Tabular and graphical implementation of the Dranchuk-Abbou Kassem equation of state
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| File Information |
| Description |
Calculates the compressibility factor of natural gases for range of pressures 'minP' to 'maxP' in steps 'Pstep'(for a given temperature T and specific gravity sg) using the Dranchuk-Abbou Kassem equation of state. The input pressures and temperature are in Psia and degree Farenheit respectively. Average absolute error of 0.486% for 0.2<Ppr<30 and 1.0<Tpr<3.0 and for Ppr<1.0 with 0.7<Tpr<1.0. Poor results for Tpr = 1.0 and Ppr>1.0(Craft&Hawkins,1991) |
| Required Products |
MATLAB
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| MATLAB release |
MATLAB 7.10 (R2010a)
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| Updates |
| 06 Jul 2012 |
Update of Sutton's Correlation |
| 09 Jul 2012 |
Restates that the input temperature is in degree Farenheit and not degree Rankine as previously stated. Code structure remains unchanged. |
| 31 Jul 2012 |
Updated commentary on range of validity |
| 28 Jan 2013 |
General in-code commentary |
| 22 Apr 2013 |
Improved bisection algorithm to ensure high pressure values are properly handled |
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