NIST REFPROP 9 is a widely cited legacy database used for calculating high-accuracy thermodynamic and transport properties of fluids, often employed in cryogenics, power cycles, and aerospace applications. While version 10 is current, version 9 remains critical for validating against established technical reports and in legacy software applications. For more details, visit NIST .
Benefits of Using NIST REFPROP 9
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).
Specialized Models
: Implements high-accuracy Helmholtz energy equations, the GERG-2008 model for natural gas, and the AGA8 equation. Fluid and Mixture Library
⚠️ Limitations
Mathematical Models
: Employs high-accuracy models including Helmholtz energy equations of state, modified Benedict-Webb-Rubin (MBWR), and extended corresponding states (ECS) for fluids with limited data.
Conclusion