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DAK Equation of State

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DAK Equation of State



05 Jul 2012 (Updated )

Tabular and graphical implementation of the Dranchuk-Abbou Kassem equation of state

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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
MATLAB release MATLAB 7.10 (R2010a)
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06 Jul 2012 1.2

Update of Sutton's Correlation

09 Jul 2012 1.3

Restates that the input temperature is in degree Farenheit and not degree Rankine as previously stated. Code structure remains unchanged.

31 Jul 2012 1.5

Updated commentary on range of validity

28 Jan 2013 1.6

General in-code commentary

22 Apr 2013 1.7

Improved bisection algorithm to ensure high pressure values are properly handled

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