The compressibility factor
Z is calculated by the Lee-Kesler equation:
Equation (4) can be rewritten in terms of the compressibility factor
31451 s Intermediate parameter in CV method T Temperature V Molar volume x Polynomial variable Z Compressibility factor
[epsilon] Smallest possible real value [theta] Angle used in the CV method [lambda] Scaling factor [sigma] Angle used in the CV method, Al pparameters are in base-10 logarithmic scale [p.
The specific terms and coefficients were determined by calculating a set of compressibility factor
values distributed in (p, T) space with the REFPROP (7) implementation of Eq.
The physical part of the compressibility factor
Introduction of Compressibility Factor
Z in Baldwin et al.
Dry air property equations were developed based on the ideal gas model and the compressibility factor
and virial contributions calculated by means of polynomial correlations as functions of pressure and temperature.
These factors are variation of gas compressibility factor
along the pipeline, height differences between locations of pipeline sections, intermediate gas tapping from the pipeline, additional pressure losses at pipeline fittings and non-stationary regime of gas flow in the pipeline.
g] is the molar gas constant, and Z is the compressibility factor
f] are the mass of the solute cylinder before and after the filling, M is the molar mass of the gas, R is the gas constant, Z is the compressibility factor
of the gas, and [m.
As an example, the equation of the relation between compressibility and input parameters is as complex as below, the effect of uncertainty in line pressure, line temperature and gas composition on compressibility factor
can be estimated using Monte Carlo method:
Equations 3 and 4 constitute the second iterative loop of this model and solution results, in particular the compressibility factor
, are functions of temperature and pressure.