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NIST REFPROP 9 — Overview and Practical Guide

What it is

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).

High Accuracy: It uses state-of-the-art equations of state, such as those from NIST, to ensure precision in simulations and experimental data correlation. Common Use Cases nist refprop 9

For a millisecond, nothing happened. Then, the machine's antique processor—a radiation-hardened dinosaur—chugged to life. Aris watched the equations scroll by in the debug window. The GERG-2008 equation of state. Extended corresponding states. Viscosity models from decades before he was born. NIST REFPROP 9 — Overview and Practical Guide

) for calculating the thermophysical properties of fluids. While newer versions (like REFPROP 10) are currently available, Version 9.0 remains widely cited in research for its accurate modeling of refrigerants, industrial chemicals, and natural gas mixtures. National Institute of Standards and Technology (.gov) Key Features of REFPROP 9 Property Calculations Common Use Cases For a millisecond, nothing happened