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NIST does not offer the full version of REFPROP 9.1 or its successor, REFPROP 10, for free. The software requires a paid license to support ongoing research and database maintenance.
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. refprop 91 free
It is a commercial, licensed product developed by NIST and distributed as a Standard Reference Database. While NIST is a government agency, this specific database is sold to cover development, maintenance, and support costs. Licensing : A valid license must be purchased for each user. NIST does not offer the full version of REFPROP 9
If mini-REFPROP does not contain the specific refrigerant or fluid mixture your project demands, several robust open-source alternatives offer comparable precision without licensing fees. CoolProp (The Leading Open-Source Equivalent) However, it is crucial to acknowledge its limitations;
If you are working with standard fluids (CO2, Nitrogen, Water, Ammonia) or common refrigerants, 9.1 is still a highly reliable tool. However, if you are working with cutting-edge alternative fuels or new refrigerants, upgrading is highly recommended.
In the world of thermodynamics, (REference Fluid PROPerties) is the gold standard for calculating the behavior of industrial fluids and refrigerants. Because it is such a critical tool, many users go looking for a free version of REFPROP 9.1 , but the reality is that the full software has always been a paid product distributed by the National Institute of Standards and Technology (NIST) .
While not a perfect one-to-one replacement, CoolProp is incredibly capable and meets the needs of most users seeking a free "REFPROP 9.1." Here’s a quick comparison:
