Near the critical point, REFPROP 9 may struggle with iteration. If you receive an "iteration limit exceeded" error, switch the input to temperature-density (T,ρ) instead of temperature-pressure (T,p). Density remains single-valued in the two-phase region, even when pressure does not.
Enhanced convergence algorithms for finding phase boundaries and critical points in complex mixtures. Transitioning to REFPROP 10
: Pressure, temperature, density, enthalpy, entropy, heat capacity, and speed of sound. Transport Properties : Viscosity and thermal conductivity. nist refprop 9
REFPROP v9.0 brought substantial enhancements to the database's functionality, cementing its role in industry and academia:
This made REFPROP 9 the backbone of many larger simulation environments, including Aspen Plus, EES (Engineering Equation Solver), and Dymola. Near the critical point, REFPROP 9 may struggle
While REFPROP 9 introduced foundational improvements in threadsafety, 64-bit support, and mixture convergence, version 10 builds upon this legacy with:
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Even with the release of Version 10, Version 9 remains widely used for several reasons:
Several specific bugs were present in the initial 9.0 release that users could encounter: REFPROP v9
This article explores the core capabilities, technical foundations, and practical applications of NIST REFPROP 9, demonstrating why it remains a cornerstone tool for engineers worldwide. What is NIST REFPROP 9?
REFPROP is referenced by as a recommended data source.