Nist Refprop 9 Link

REFPROP 9 is a computer program used to calculate the thermodynamic and transport properties of pure fluids and mixtures. Researchers frequently cite this version in papers involving:

For developers, the DLL integration allows embedding these high-accuracy properties directly into customized software solutions.

NIST REFPROP 9 is a computer program and data repository. It calculates the thermophysical properties of pure fluids and mixtures. The software relies on the most accurate pure-fluid equations of state currently available. nist refprop 9

Vapor-liquid equilibrium (VLE) data, dew points, bubble points, and critical points. 2. Core Models and Equations of State

Version 9.0 introduced updated equations of state for fluids like cyclopentane, R-1234yf, and R-1234ze(E), and expanded the number of binary mixtures with interaction parameters from 303 to 639. Technical Architecture REFPROP 9 is a computer program used to

REFPROP 9 is designed to provide the . Accuracy estimates are built into the software:

For pure fluids, REFPROP 9 primarily utilizes wide-range equations of state formulated in terms of . These models are explicitly explicit in dimensionless Helmholtz energy, using temperature and density as the independent variables. This mathematical formulation allows for the direct derivation of all other thermodynamic properties through differentiation, minimizing compounding computational errors. Modified Benedict-Webb-Rubin (MBWR) Equation It calculates the thermophysical properties of pure fluids

Although NIST has updated the software, version 9 introduced several critical advancements that cemented its status. It improved upon earlier versions with better mixtures models and more robust numerical solvers.

The release of in mid-2018 marked the official end of active development for version 9.1. It is crucial to recognize that version 9.1 has been officially superseded by the more powerful Version 10, which NIST continues to update and support. Version 10 brought a dramatically expanded library of 147 pure fluids and 5 pseudo-pure fluids (up from 105 in version 9), new equations of state for many fluids, the implementation of the advanced GERG-2008 mixture model for natural gas systems, and numerous improvements to the graphical interface and calculation routines.

Better handling of solid phases (like dry ice formation in CO2 systems).

Even with the release of Version 10, Version 9 remains widely used for several reasons: