pTD: Pressure, Function of Temperature and Density

In IAPWS95: Thermophysical Properties of Water and Steam

Pressure, Function of Temperature and Density

Description

The function pTD(T,D,digits=9) returns the water pressure, p [ MPa ], for given Temp [K] and D [kg/m3], returning also an error message, if any error occur.

Usage

pTD(Temp, D, digits = 9)

Arguments

Temp	Temperature [ K ]
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 Pressure: p [ MPa ] and an Error Message (if an error occur: errorCodes)

Examples

Temp <- 500.
D <- 838.025
p <- pTD(Temp,D)
p

Temp <- 647.096
D <- 322.
p <- pTD(Temp,D)
p

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