NIST REFPROP 9 is a software program that implements the most accurate equations of state (EOS) available for a wide range of fluids. Unlike simple lookup tables or ideal gas laws, REFPROP uses complex Helmholtz energy formulations to predict properties across a broad spectrum of temperatures and pressures—including the critical region, two-phase conditions, and cryogenic temperatures.
Released as a stable, mature version, REFPROP 9 represents the culmination of years of experimental data correlation. It supports over 147 pure fluids (depending on the specific sub-version) and allows users to calculate properties for mixtures containing up to 20 components. nist refprop 9
Version 9 represented a significant leap forward in fluid modeling. Here are the standout features that made this version a staple in the engineering industry: NIST REFPROP 9 is a software program that
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REFPROP (Reference Fluid Thermodynamic and Transport Properties) is a NIST-maintained software library and database that provides high-accuracy thermophysical property models for pure fluids and mixtures. Version 9 is a widely used release that implements equations of state, transport property correlations, and mixture models intended for engineering and research applications where precision matters (HVAC, refrigeration, power cycles, cryogenics, process simulation, and scientific studies).