IAPWS95 (version 1.2.4)

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

Description

The function dpdDTp(Temp,p) returns the pressure derivative with respect to Density, dpdD, for given Temp [K] and p [MPa].

Usage

dpdDTp(Temp, p, digits = 9)

Value

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

Arguments

Temp

Temperature [ K ]

p

Pressure [ MPa ]

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.

Examples

Temp <- 500.
p <- 10.0003858
dpdD <- dpdDTp(Temp,p)
dpdD