Nist Refprop 9 Jun 2026

Calculations for vapor-liquid (VLE), liquid-liquid, and solid-liquid systems.

In the world of thermodynamics, chemical engineering, and HVAC design, accuracy isn't just a goal—it is a requirement. When designing a refrigeration system or modeling a chemical plant, a tiny error in calculating a fluid's viscosity or enthalpy can lead to massive inefficiencies or even catastrophic equipment failure. nist refprop 9

Version 9 uses a 16-bit installer on some distributions. On 64-bit Windows 10/11, you may need to run in compatibility mode (XP SP3). Version 9 uses a 16-bit installer on some distributions

: It uses state-of-the-art equations of state, such as those from NIST , to ensure precision in simulations and experimental data correlation. Common Use Cases Common Use Cases Aris cross-checked the numbers against

Aris cross-checked the numbers against his manual calculations. They matched. Then he checked the valve's factory spec sheet, partially recovered from the corrupted file. The REFPROP numbers were within 0.02% of the original.

: It can be accessed through a graphical user interface (GUI), linked to Excel via an Add-In , or called from custom applications via FORTRAN subroutines and a DLL. Core Features of Version 9.1 REFPROP Documentation - Thermodynamics Research Center

This made REFPROP 9 the backbone of many larger simulation environments, including Aspen Plus, EES (Engineering Equation Solver), and Dymola.