A cross-platform, open-source, alternative to NIST REFPROP. Based on reference-accuracy equations of state and transport property correlations, for refrigerants Water, CO2, R134a, Nitrogen, Argon, Ammonia, Air, R404a, R410a, and Propane. 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.