The underlying dynamic link library (DLL) connects with external codebases. Developers can call REFPROP using: Python (via wrappers like CtYpes or CoolProp) C++ and Fortran Process Simulators

One of REFPROP 9's most powerful features is its ability to handle mixtures of up to 20 distinct components. It utilizes advanced mixing rules to accurately predict the phase behavior, dew points, and bubble points of multi-component systems, making it indispensable for natural gas processing and distillation column design. Calculable Properties

The , particularly Version 9 , has long served as a cornerstone tool for engineers, scientists, and researchers in the fields of refrigeration, power generation, and chemical engineering. Developed by the National Institute of Standards and Technology (NIST), this software suite provides the most accurate, industry-standard data for the physical properties of fluids, mixtures, and alternative refrigerants.

NIST REFPROP 9 is a software program that calculates the thermodynamic and transport properties of industrially important fluids and their mixtures. Its core strength lies in its reliance on high-accuracy, fundamental equations of state rather than simple interpolation methods.

Users currently on REFPROP 9.x are encouraged to upgrade to version 10 to benefit from ongoing support, accuracy enhancements, and the latest mixture parameters.

MATLAB interfaces allow users to call REFPROP functions directly. For 64-bit MATLAB, the 64-bit DLL must be used. Environment variables (e.g., RP_PATH ) may need to be set.

NIST REFPROP 9: The Standard in Thermodynamic Property Modeling

421.33 kg/m³ Viscosity: 1.87e-5 Pa·s Thermal Conductivity: 0.189 W/(m·K)

For mixtures, REFPROP 9 utilized a sophisticated model that applies mixing rules to the Helmholtz energy of the components and incorporates a departure function to correct for non-ideal mixing behavior. This approach was particularly important for accurately modeling complex industrial mixtures, such as natural gas, which would benefit significantly from the later addition of GERG-2008 models in Version 10.

For embedding fluid property routines into proprietary simulation code. Legacy Value of Version 9