Refprop 9.1 -

For experienced users, we recommend:

Prior to version 9.0, mixture calculations relied on mixing rules (like van der Waals or Wong-Sandler). REFPROP 9.1 fully leverages the . This multi-parameter EOS was developed by the European Research Group on Gas (GERG) and is valid for natural gas mixtures and hydrocarbon refrigerants. It covers components such as methane, nitrogen, carbon dioxide, ethane, propane, and many more with unprecedented accuracy—often within ±0.1% for density in the gas phase. refprop 9.1

. While the software itself is the "paper" in a citation sense, researchers typically cite the version-specific documentation or the underlying fundamental models. Primary Citation for REFPROP 9.1 For experienced users, we recommend: Prior to version 9