getEquilibriumProperty

getEquilibriumProperty returns the overall property calculated at thermodynamic equilibrium at given conditions. Feeds are already in equilibrium when the unit operation is calculated; properties for feeds can be obtained by getFeedProp. For a complete equilibrium result, see getEquilibrium.

Syntax

value=getEquilibriumProperty(propName,moleFraction,propName1,propVal1,propName2,propVal2)

Arguments:

propName
String; name of the property to calculate at equilibrium. The following properties can be specified:

Property	Description	Unit of measure
enthalpy	Default enthalpy	J / mol
enthalpyF	Enthalpy - including formation terms	J / mol
enthalpyNF	Enthalpy - not including formation terms	J / mol
entropy	Default entropy	J / mol / K
entropyF	Entropy - including formation terms	J / mol / K
entropyNF	Entropy - not including formation terms	J / mol / K
internalEnergy	Energy	J / mol
volume	Specific volume	m3 / mol

Not all of these properties may be supported by the underlying thermo system.

moleFraction
Double; the overall composition for the equilibrium calculation. Must be a vector with one value for each compound.

propName1
String; name of the first property for the equilibrium specification of the product. The following properties can be specified:

Property	Description	Unit of measure
temperature	Temperature	K
pressure	Pressure	Pa
vaporFraction	Mole fraction of the vapor phase	-
enthalpy	Default enthalpy	J / mol
enthalpyF	Enthalpy - including formation terms	J / mol
enthalpyNF	Enthalpy - not including formation terms	J / mol
entropy	Default entropy	J / mol / K
entropyF	Entropy - including formation terms	J / mol / K
entropyNF	Entropy - not including formation terms	J / mol / K
internalEnergy	Energy	J / mol
volume	Specific volume	m3 / mol

See getFeedProp for more information on the different enthalpies. Not each of the above properties may be supported by the underlying thermo system. Even if both propName1 and propName2 specify supported properties that are supported, the combination of the two may not be a supported specification for an equilibrium calculation.

propVal1
Double; the value of the property specified by propName1.

propName1
String; name of the second property for the flash specification of the product. See above for supported properties.

propVal1
Double; the value of the property specified by propName2.

Returns:

value
Double; value of the calculated property

Example

» X=[0.1 0.2 0.5 0.2]

X =

    0.1000    0.2000    0.5000    0.2000

» h=getEquilibriumProperty('enthalpy',X,'temperature',150,'pressure',101325)

h =

  -1.3903e+004