CoolProp, in particular, is widely considered the best free alternative. It even supports the same underlying equations as REFPROP for many fluids.
– Use the built-in "Table Generator" to create pressure-enthalpy diagrams. Refprop 10 Download
The download includes a REFPROP.XLA Add-in. Modern 10.0 usage prefers the =REFPROP(...) syntax over older =Density(...) commands, which enhances efficiency. CoolProp, in particular, is widely considered the best
Improved modeling for water mixtures (e.g., CO2+water) and new equations of state for numerous fluids (cyclopentane, siloxanes, refrigerants). How to Download Refprop 10 (NIST) Refprop 10 Download
Have you successfully installed REFPROP 10? Share your experience or ask questions in the comments below (on our original blog). For official support, always contact NIST SRD directly.
NIST maintains a robust GitHub repository for wrappers.