Refprop 91 Free !!hot!! May 2026
While searching for "REFPROP 9.1 free" often leads to unofficial or trial versions, it is important to distinguish between the full commercial software and the legitimate free options provided by (National Institute of Standards and Technology). The Reality of "Free" REFPROP 9.1
CoolProp
(Highly recommended)
NIST Chemistry WebBook
If you only need data for a single fluid at specific points (like the boiling point of R134a at a certain pressure), you can use the . It is free to use online. It uses the same underlying equations as REFPROP. refprop 91 free
mini-REFPROP (Free Version)
: This is a "sample" version meant for teaching. It contains only a subset of common fluids like water, CO2cap C cap O sub 2 , nitrogen, and methane. Access and Availability
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. While searching for "REFPROP 9
The engineering community thrives on accuracy and reliability. NIST REFPROP costs money because maintaining the International Association for the Properties of Water and Steam (IAPWS) formulations and GERG-2008 mixtures requires expensive research.
- Purpose: high-accuracy thermodynamic and transport property calculations for engineering and research (e.g., density, enthalpy, entropy, viscosity, thermal conductivity, sound speed).
- Typical users: HVAC/R engineers, refrigeration researchers, cryogenics, CFD/modeling practitioners, and academics.
- Licensing: REFPROP is proprietary commercial software distributed by NIST. Official downloads require accepting licensing terms and (for recent versions) may involve payment or institutional access.
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