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The function phirD(Temp,D,digits=9) returns the First Derivative of the
Residual-Gas Part of the Dimensionless Helmholtz Energy Equation for given Temp [K] and D [kg/m3].
phirD(Temp, D, digits = 9)The First Derivative of the Residual-Gas Part of the Dimensionless Helmholtz Energy Equation: phirD, and an Error Message (if an error occur: errorCodes)
Temperature [ K ]
Density [ kg m-3 ]
Digits of results (optional)
This function calls a Fortran DLL that solves the Helmholtz Energy Equation. in accordance with the Revised Release on the IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use (June 2014) developed by the International Association for the Properties of Water and Steam, http://www.iapws.org/relguide/IAPWS-95.html. It is valid from the triple point to the pressure of 1000 MPa and temperature of 1273.
Temp <- 500.
D <- 838.025
phir_D <- phirD(T,D)
phir_D
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