NIST-ACerS Phase Equilibria Diagrams Database These properties can be displayed in tables and plots through the graphical user interface they are also accessible through spreadsheets or user-written applications accessing the REFPROP DLL or the FORTRAN property subroutines . REFPROP is based on the most accurate pure fluid and mixture models currently available. This program calculates the thermodynamic and transport properties of industrially important fluids and their mixtures. REFPROP is an acronym for REFerence fluid PROPerties.

NIST Reference Fluid Thermodynamic and Transport Properties Database: Version 10 NIST/ASME Steam Properties Database: Version 3.0īased upon the International Association for the Properties of Water and Steam (IAPWS) 1995 formulation for general and scientific use for the thermodynamic properties of water, this updated version provides water properties from the international standards over a wide range of conditions. Viscosity and thermal conductivity are modeled with either fluid-specific correlations, an ECS method, or in some cases the friction theory method.SUPERTRAPP is an interactive computer program for predicting thermodynamic and transport properties of pure fluids and fluid mixtures containing up to 20 components. Mixture calculations employ a model that applies mixing rules to the Helmholtz energy of the mixture components it uses a departure function to account for the departure from ideal mixing. It implements three models for the thermodynamic properties of pure fluids: equations of state explicit in Helmholtz energy, the modified Benedict-Webb-Rubin equation of state, and an extended corresponding states (ECS) model. REFPROP is based on the most accurate pure fluid and mixture models currently available. The equations are generally valid over the entire vapor and liquid regions of the fluid, including supercritical states the upper temperature limit is usually near the point of decomposition of the fluid, and the upper pressure (or density) limit is defined by the melting line of the substance. Their high accuracy is obtained through many coefficients in the equations, and thus the calculation speed will be slower than other equations such as the Peng-Robinson cubic equations.

These equations are the most accurate equations available worldwide. The program uses equations for the thermodynamic and transport properties to calculate the state points of the fluid or mixture. The REFPROP 'database' is actually a program and does not contain any experimental information, aside from the critical and triple points of the pure fluids. REFPROP is a Program, not a Database Containing Measurements. This program, developed by the National Institute of Standards and Technology (NIST), calculates the thermodynamic and transport properties of industrially important fluids and their mixtures. In the thermodynamic module also FLUIDCAL is used by CONVAL ®

Nist refprop software