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A cross-platform, open-source, alternative to NIST REFPROP. Based on reference-accuracy equations of state and transport property correlations for refrigerants like Water, CO2, R134a, Nitrogen, Argon, Ammonia, Air, R404a, R410a, Propane and many others. A selection of secondary working fluid properties are also available. Can also make use of REFPROP when available.

In addition, calculations for Humid Air Properties based on ASHRAE RP-1485 are provided.

Wrappers are available for MATLAB, Octave, Python, C#, Fortran and many more.

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Website http://coolprop.sourceforge.net