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IdealGasThermoProps2

The calling protocol is

Call IdealGasThermoProps2(N,G$[1..N],T,P,f[1..N]: MW, h, s, cp)

Inputs:
N number of components in the mixture
G$[1..N]  an array of string constants or string variables that contains the names of the ideal gases that make up the mixture (and are contained in the EES property library).  
T the temperature in the units EES is configured to work in.
P the pressure in the units EES is configured to work in.  (Pressure is used only for calculation of specific entropy)
f[1..N] the mass or mole fractions of the gases in the string array G$[1..N].  The sum of the values of f must add to 1.0.  Supply mass fractions if EES is configured to work with specific properties on a mass basis.  Otherwise, supply mole fractions. 

Outputs:
MW The molar mass of the mixture in kg/kmol or lbm/lbmol
h the specific enthalpy of the mixture determined as the mole fraction-weighted average of the specific enthalpy of the gases in the mixture.  The units of h will be returned on a per unit mass basis if EES is configured to provide properties on a mass basis.  Otherwise the units of h will be returned on a molar basis.
s the specific entropy of the mixture determined as the mole fraction-weighted average of the specific entropy of the gases in the mixture plus the entropy change of mixing the gases.  The units of s will be returned on a per unit mass basis if EES is configured to provide properties on a mass basis.  Otherwise, the units of s will be returned on a molar basis.
cp The specific heat capacity of the gas mixture determined as the mole fraction-weighted average of the specific heat capacity of the gases in the mixture.

Example:

$UnitSystem SI Mass J K Pa
$VarInfo T Units = 'K'
$VarInfo P Units = 'Pa'
$VarInfo MW Units = 'kg/kmol'
$VarInfo h Units = 'J/kg'
$VarInfo s Units = 'J/kg-K'
$VarInfo cP Units = 'J/kg-K'

N = 3 
G$[1] = 'N2'
G$[2] = 'O2'
G$[3] = 'CO2'
T = 400 [K]
P = 100000 [Pa]
f[1] = 0.2
f[2] = 0.4
f[3] = 0.4

CALL IdealGasMixtureThermoProps2(N,G$[1..N],T,P,f[1..N]:MW, h, s, cp)


{Solution:
MW = 34.81 [kg/kmol]
h = -3.481e6 [J/kg]
s = 6409 [J/kg-K]
cp = 960.8 [J/kg-K]
}

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