Nist Refprop 9 [better] Online

Including HFCs, HFOs (hydrofluoroolefins), and natural refrigerants like CO2cap C cap O sub 2 and ammonia. Hydrocarbons: Methane, ethane, propane, butane, etc. Cryogens: Nitrogen, oxygen, hydrogen, and helium. 4. Software Interoperability

: It provides high-accuracy data for thermodynamic properties (density, enthalpy, entropy) and transport properties (viscosity, thermal conductivity). Phase Coverage

For certain standard fluids, the MBWR equation of state is applied. This 32-term empirical equation is highly accurate for hydrocarbons and cryogenic gases, providing precise density calculations across vast temperature and pressure ranges. Mixture Models: The GERG-2008 Standard nist refprop 9

Using specialized macro worksheets and Add-Ins to call fluid property formulas directly into spreadsheets.

(released around 2010–2013, with updates like 9.1) is a widely used stable version. It is the last version with a classic Windows interface before major GUI changes in v10. This 32-term empirical equation is highly accurate for

Traditional CFCs, HCFCs, HFCs (like R-134a, R-410A), and modern low-GWP (Global Warming Potential) hydrofluoroolefins (HFOs) like R-1234yf.

One of REFPROP 9’s greatest strengths is its ability to handle mixtures. It allows for the mixing of up to 20 distinct components simultaneously. It calculates properties for predefined standard mixtures (like air or specific R-400 and R-500 series refrigerant blends) and allows users to define custom, arbitrary mixtures by mole or mass fraction. 3. Calculated Properties Calculated Properties Methane

Methane, ethane, ethylene, butane, and heavier alkanes.