phi0D: First Derivative of the Ideal-Gas part of the Dimensionless...

In IAPWS95: Thermophysical Properties of Water and Steam

First Derivative of the Ideal-Gas part of the Dimensionless Helmholtz Energy Equation with respect to Density, Function of Density

Description

The function phi0D(D,digits=9) returns the First Derivative of the Ideal-gas part of the dimensionless Helmholtz Energy Equation for a given D [kg/m3].

Usage

phi0D(D, digits = 9)

Arguments

D	Density [ kg m-3 ]
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 First D Derivative of Ideal-gas part of the Helmholtz Energy: phi0D and an Error Message (if an error occur: errorCodes)

Examples

D <- 838.025
phi_0 <- phi0D(D)
phi_0

IAPWS95 documentation built on Sept. 11, 2023, 5:11 p.m.