The impact of REFPROP is pervasive across multiple engineering sectors. In the industry, REFPROP has been instrumental in the transition away from ozone-depleting refrigerants (CFCs/HCFCs) toward low-global-warming-potential (GWP) alternatives. Engineers use it to precisely model cycle performance, determine compressor work, and size heat exchangers.
However, REFPROP is not without limitations. First, it is a , not a process simulator; it lacks unit operations like reactors or distillation columns. Second, its computational speed, while generally good, can be slower than simpler cubic EOS models (e.g., Peng-Robinson) when iterating millions of times in a complex model. Finally, the license cost (while reasonable for professionals) and the need for periodic updates to access new refrigerants or improved equations can be a barrier for students or small firms. refprop
In the realms of chemical engineering, mechanical engineering, and thermodynamics, the accurate prediction of fluid properties is not merely an academic exercise—it is the bedrock of reliable process design, energy efficiency, and safety analysis. Whether designing a power plant, a refrigeration cycle, or a natural gas pipeline, engineers must know how a fluid will behave under varying temperatures and pressures. Enter REFPROP (Reference Fluid Thermodynamic and Transport Properties), a software program developed by the National Institute of Standards and Technology (NIST). Over the past three decades, REFPROP has evolved from a niche academic tool into the global gold standard for calculating the thermophysical properties of pure fluids and their mixtures. The impact of REFPROP is pervasive across multiple
The primary strength of REFPROP is its . Because it is maintained by NIST, the underlying data is subject to rigorous, peer-reviewed validation against experimental benchmarks. This gives users confidence that a simulation run in 2024 will yield the same results as one run in 2010. Additionally, its integration with major engineering platforms (MATLAB, Python, Excel via the REFPROP DLL) allows for seamless incorporation into larger simulation workflows. However, REFPROP is not without limitations
The program’s true power lies in its ability to handle mixtures. Using models such as the extended corresponding states model or the more modern GERG-2008 EOS for natural gas mixtures, REFPROP can predict the behavior of complex blends (e.g., refrigerants, hydrocarbon mixtures) with remarkable fidelity. Furthermore, it does not stop at thermodynamic properties; REFPROP also calculates vital transport properties such as viscosity, thermal conductivity, and surface tension, which are essential for heat transfer and fluid flow calculations.
In the sector, REFPROP is used to simulate the phase behavior of hydrocarbons in pipelines and separators. Its accurate prediction of dew points and hydrate formation temperatures prevents costly operational failures. Similarly, in cryogenics , the software is invaluable for modeling the behavior of liquefied natural gas (LNG), liquid hydrogen, and helium at near-absolute-zero temperatures.