Nist Refprop 9 -

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NIST REFPROP 9.0 (REFerence PROPerties) is a legacy version of the industry-standard software developed by the National Institute of Standards and Technology (

) for calculating the thermophysical properties of fluids. While newer versions (like REFPROP 10) are currently available, Version 9.0 remains widely cited in research for its accurate modeling of refrigerants, industrial chemicals, and natural gas mixtures. National Institute of Standards and Technology (.gov) Key Features of REFPROP 9 Property Calculations

: It provides high-accuracy data for thermodynamic properties (density, enthalpy, entropy) and transport properties (viscosity, thermal conductivity). Phase Coverage

: Supports calculations across liquid, gas, and supercritical phases, as well as subcooled and metastable regions. Fluid Support

: Includes models for pure fluids and complex multi-component mixtures. Integration

: 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

(REference Fluid PROPerties) is a standard reference database developed to provide the most accurate thermophysical properties for industrially important fluids and their mixtures. It is widely used in refrigeration, aerospace, and natural gas industries to optimize equipment and chemical processes. National Institute of Standards and Technology (.gov) Core Capabilities and Scope REFPROP 9.0 and its sub-version 9.1 cover over 120 pure fluids and more than 200 predefined mixtures National Institute of Standards and Technology (.gov) Fluid Types:

Includes refrigerants (HFCs, CFCs, HFOs), hydrocarbons, natural gases, cryogens, and standard substances like water, air, and ammonia. Calculated Properties: Thermodynamic: nist refprop 9

Pressure, temperature, density, enthalpy, entropy, heat capacity, and speed of sound. Transport: Viscosity, thermal conductivity, and surface tension. Phase Equilibrium:

Vapor-liquid equilibrium (VLE) for pure fluids and mixtures. Thermodynamic Modeling Approach REFPROP ensures thermodynamic consistency by using an Equation of State (EOS)

approach rather than separate correlations for individual properties. PubMed Central (PMC) (.gov) REFPROP Documentation - Thermodynamics Research Center

NIST REFPROP 9 (Reference Fluid Thermodynamic and Transport Properties) is a legacy version of a widely used software program designed to provide high-accuracy thermophysical properties of industrially important fluids and their mixtures. While it has been superseded by newer versions like REFPROP 10, it remains a foundational tool in mechanical engineering and thermodynamics. Core Capabilities

Fluid Database: It includes a library of over 100 pure fluids, such as nitrogen, oxygen, argon, carbon dioxide, and various refrigerants.

Thermodynamic Properties: It calculates essential values including density, enthalpy, entropy, and vapor-liquid equilibrium (VLE).

Mixture Modeling: REFPROP 9 can calculate properties for mixtures with up to 20 components, utilizing models like the Tillner-Roth and Friend correlation for ammonia-water systems.

High Accuracy: 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

Power Cycles: Designing and simulating cycles like the Regenerative Brayton Cycle or Ocean Thermal Energy Conversion (OTEC). If you want, I can:

Cryogenics: Predicting properties for low-temperature applications, such as the MIRI cooler for space telescopes.

Industrial Hardware: Serving as a reference library for mass flow meters and controllers to allow field adjustments for different gas types.

Fluid Physics: Analyzing wicking performance and liquid propagation in complex structures.

NIST REFPROP 9.1 is a legacy version of the REference Fluid PROperties database (SRD 23). While it has been officially superseded by Version 10, it remains a cornerstone for thermodynamic and transport property calculations in industries like refrigeration, natural gas, and aerospace. Key Technical Capabilities

Property Calculations: It calculates thermodynamic properties (density, enthalpy, entropy) and transport properties (viscosity, thermal conductivity) for pure fluids and mixtures.

Fluid Support: Version 9.1 included 105 pure fluids and allowed for mixtures with up to 20 components.

Mathematical Models: Employs high-accuracy models including Helmholtz energy equations of state, modified Benedict-Webb-Rubin (MBWR), and extended corresponding states (ECS) for fluids with limited data.

Integration: 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

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When it was available, REFPROP 9 used a single-user license key for Windows. It did not require an internet connection after activation. Pricing in 2024 dollars would have been approximately:

REFPROP (short for REFrigerant PROPerties) is a software program developed by the National Institute of Standards and Technology (NIST). It provides thermophysical properties of pure fluids and mixtures, based on the most accurate equations of state available.

Version 9, released in several sub-versions (9.0, 9.1), is widely used by engineers, researchers, and educators in the fields of HVAC&R, chemical engineering, energy systems, and fluid mechanics.

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.

If you are still using REFPROP 9 (or maintaining legacy systems), these tips will maximize your productivity:

The GUI in v9 is menu-driven with separate windows for:

REFPROP 9 includes properties for:

The natural gas industry relies on REFPROP 9 for custody transfer—the point where gas changes ownership. The software’s GERG-2008 mixture model calculates the calorific value (heating value) of pipeline gas with traceable uncertainty, ensuring that billions of dollars of natural gas are billed correctly.