While the full NIST REFPROP 9.1 is a proprietary software that requires a paid license from the National Institute of Standards and Technology (NIST), a free, limited version called mini-REFPROP is available for educational purposes. The Role of REFPROP in Modern Engineering
Here’s why the story would be incomplete — and what likely happens next:
Pros: Totally free, high accuracy, and supports most common fluids.
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High Accuracy: Models for pure fluids and mixtures that often match experimental data uncertainties.
