MODE = DERIV (=92)

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MODE = DERIV (=92)

An EES_REFPROP interface dated March 31, 2025 or later is required to use these functions. Also, it is easier to use the EES Property format for these functions.

Description: Calculate derivative properties for given temperature and density
     In1 = Temperature in K
     In2 = Density in kmol/m3
     In3 = mole fraction of first component (skip for pure fluid)
     ...
     InN = mole fraction of next to last component

     Out1 = Isothermal Compressibility in 1/kPa
     Out2 = Volumetric Expansion Coefficient in 1/K
     Out3 = Isentropic Exponent [dimensionless]
     Out4 = Joule-Thomson Coefficient in K/kPa

Example :
$UnitSystem SI K kPa molar kJ
DERIV=92                  "mode for derivative properties"
T=250 [K]                   "temperature"
rho=0.1 [kmol/m^3]      "molar density"
$VarInfo VolExpCoef units=1/kPa
$VarInfo isothermalcompress units=1/K
$VarInfo isentropexp units=[-]
$VarInfo joulethomson units=K/kPa
CALL ees_refprop('propane', DERIV, T, rho : VolExpCoef, Isothermalcompress, Isentropexp, Joulethomson)

{Solution:
Isentropexp=1.115 [-]
Isothermalcompress=0.004832 [1/K]
Joulethomson=0.03051 [K/kPa]
VolExpCoef=0.005432 [1/kPa]
}

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