| phi0DT {IAPWS95} | R Documentation |
Second Derivative of the Ideal-Gas Part of the Dimensionless Helmholtz Energy Equation with respect to Density and Temperature
Description
The function phi0DT(digits=9) returns the Second Derivative of the
Ideal-gas Part of the Dimensionless Helmholtz Energy Equation with respect to
Density and Temperature.
Usage
phi0DT(digits = 9)
Arguments
digits |
Digits of results (optional) |
Details
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.
Value
The Second DT Derivative of Ideal-gas Part of the Helmholtz Energy: phi0DT and an Error Message (if an error occur: errorCodes)
Examples
phi0_DT <- phi0DT()
phi0_DT