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Nist - Refprop 9

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Nist - Refprop 9

Current version as of 2026 is , but NIST still supports v9 license transfers for existing users.

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. nist refprop 9

: Commonly used as an Excel add-on or linked with engineering software like MATLAB and ANSYS for cycle design and numerical simulations. National Institute of Standards and Technology (.gov) Common Applications Current version as of 2026 is , but

Distributed via a secure executable installer or source code license for compilation on Linux/macOS systems. Density remains single-valued in the two-phase region, even

) to provide accurate gas property references in flow meters and controllers. ResearchGate

: Implements high-accuracy Helmholtz energy equations, the GERG-2008 model for natural gas, and the AGA8 equation. Fluid and Mixture Library