| dpdDTD {IAPWS95} | R Documentation |
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