For many engineers, REFPROP 9.1 was the reliable workhorse of the early 2010s. It provided critical data for refrigerants, hydrocarbons, and cryogens. Its accuracy made it the gold standard against which other commercial simulators, such as Aspen HYSYS or COOLPROP, were often validated. The specific demand for version 9.1, even years after its successor was released, stems from its stability and the familiarity long-time users have with its specific input/output structures. However, it is crucial to acknowledge its limitations; version 9.1 lacks the expanded fluid lists and modern interface features of the current version (version 10 and beyond), and it may not include the most recent refrigerant blends required for modern environmental compliance.
No. REFPROP is commercial software distributed by NIST. It requires a purchased license to use legally. refprop 91 free
For programmers: The Cantera library (cantera.org) includes thermodynamic models comparable to REFPROP 9.1 for many gases. Combined with Python’s SciPy, you can create your own REFPROP-like scripts for free. For many engineers, REFPROP 9
You can access REFPROP through Python, C#, or MATLAB via community-developed wrappers . The specific demand for version 9
If you work in thermodynamics, chemical engineering, or HVAC research, you are likely familiar with . It is the industry-standard reference fluid thermodynamic and transport properties database developed by the National Institute of Standards and Technology (NIST).
If you are currently using REFPROP 9.1, should you switch? Here is a quick comparison:
: Includes a massive library of fluids and mixtures.