Computer codes used in the calculation of high-temperature thermodynamic properties of sodium

Abstract

Three computer codes -SODIPROP, NAVAPOR, and NASUPERhave been written in order to calculate a self-consistent set of thermodynamic properties for saturated, subcooled, and superheated sodium. These calculations incorporate new critical parameters (temperature, pressure, and density) and recently derived single equations for enthalpy and vapor pressure. The following thermodynamic properties have been calculated in these codes: enthalpy, heat capacity, entropy, vapor pressure, heat of vaporization, density, volumetric thermal expansion coefficient, compressibility, and thermal pressure coefficient. In the code SODIPROP, these properties are calculated for saturated and subcooled liquid sodium. Thermodynamic properties of saturated sodium vapor are calculated in the code NAVAPOR. The code NASUPER calculates thermodynamic properties for superheated sodium vapor only for low (<1644 K) temperatures. No calculations were made for the supercritical region. Liquid heat capacity along the saturation line Volumetric thermal expansion coefficient along the saturation curve (-1/P^ 3PJ,/3T) Temperature derivative of vapor pressure Critical temperature Critical density Critical pressure These variables are in CGS units. Computer code variables with names idential except for an 's' added to the end are the same variables in SI units, e.g., PSATS is vapor pressure in MPa.GVSATS is the liquid thermal pressure coefficient in MPa/K.