dpdDTD: Pressure Derivative with respect to Density, Function of...

In IAPWS95: Thermophysical Properties of Water and Steam

Pressure Derivative with respect to Density, Function of Temperature and Density

Description

The function dpdDTD(Temp,D,digits=9) returns the pressure derivative with respect to Density, dpdD, for given T [K] and D [kg m-3].

Usage

dpdDTD(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 derivative with respect to D: dp/dD [ MPa kg-1 m3 ] and an Error Message (if an error occur: errorCodes)

Examples

Temp <- 500.
D <- 838.025
dpdD <- dpdDTD(Temp,D)
dpdD

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