NIST Refprop is a proprietary database. While many websites claim to offer a "free download" for the 2021 version, these often involve significant risks:
: A trial version of the REFPROP CAPE-OPEN Property Package Manager is available, though it requires a fee after the trial ends. refprop 10 free download 2021
: New reference equations of state for ammonia, helium, and heavy water. NIST Refprop is a proprietary database
is a free, open-source library that implements many EOS from REFPROP (including IF-97 for water and Span-Wagner for CO2). It’s compatible with Python, MATLAB, C++, and Excel. Version 6.4.1 (2021) matches REFPROP 10 accuracy for common refrigerants. and heavy water. is a free