Supports equations of state, transport properties, and complex fluid mixtures.

However, NIST provides an official, version of the software specifically for educational purposes: mini-REFPROP .

CanteraCantera is an open-source suite of tools for problems involving chemical kinetics, thermodynamics, and transport processes. It is highly favored in combustion research and complex fluid systems. How to Legally Access REFPROP

CoolProp is a fully open-source, free C++ library that implements thermodynamic and transport properties. It matches REFPROP’s accuracy for most common fluids and integrates directly with Python, MATLAB, and Excel.

Standardized wrappers make it incredibly simple to call REFPROP libraries directly into coding workflows. The Reality Behind "Free Download" Searches

: Includes models for 147 pure fluids and 5 pseudo-pure fluids (like air). New Fluids : Added refrigerants like R1234yfcap R 1234 y f , plus various hydrocarbons and solvents.

NIST provides a limited, free version of the software called .

To download Refprop 10 for free in 2021, follow these steps:

While a "free download" of the full version isn't an option, NIST provides legitimate ways to access REFPROP's capabilities for free or at a reduced cost.

Version 10 represents a significant leap forward from previous iterations (like Version 9.1), offering improved accuracy and a wider database of fluids.

If you want to move forward with your thermodynamic modeling safely, let me know you plan to use (e.g., Excel, Python, or MATLAB ), or what specific fluids you need to analyze. I can provide a step-by-step guide to setting up either mini-REFPROP or CoolProp for your environment! Share public link