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You can purchase the latest version directly from NIST. While 9.1 is older, purchasing the current version often grants you the most up-to-date data, which is more reliable for modern engineering applications. 3. The Mini-RefProp (Free Version) NIST does offer a "Mini-RefProp" for free.
Specifically designed to target engineering workstations. refprop 91 free
Excellent for students learning the interface or testing basic thermodynamic cycles. Legitimate Free Alternatives to RefProp You can purchase the latest version directly from NIST
Fees fund the continued updates of fluid property libraries. How to Get RefProp (The Right Way) The Mini-RefProp (Free Version) NIST does offer a
RefProp (Reference Fluid Thermodynamic and Transport Properties) is a highly specialized program developed by the National Institute of Standards and Technology (NIST). It is the industry gold standard for calculating the physical properties of chemicals and refrigerant blends.
Because it is proprietary software, finding a legal "free" version—especially for version 9.1—requires understanding how NIST distributes its data and what legitimate alternatives exist. Understanding RefProp 9.1
NIST invests heavily in experimental data collection.