NIST Standard Reference Database 23

NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP): Version 7.0

 

Note: Asian users who experience problems installing Refprop should contact Eric Lemmon at ericl@boulder.nist.gov.

REFPROP 7.0 has replaced NIST Thermophysical Properties of Air and Air Component Mixtures: AIRPROPS NIST 72

Version 7.0 represents a major revision and upgrade of this important database.  New features include:

• additional fluids and mixtures
• updated and improved models for many fluids and mixtures
• a graphical user interface (GUI) which retains the overall look and feel of the version 6 GUI, but incorporates enhanced usability and many new features and options
• greatly improved speed of calculation
• many more options to prepare plots of thermodynamic surfaces
• many more calculation options are supported (for example, flash calculations now support virtually any combination of temperature, pressure, density, enthalpy, entropy, or quality as the independent variables)
• support for Excel spreadsheets and other applications

Version 7.0 includes 39 pure fluids and mixtures with up to 20 components:

• The environmentally acceptable HFCs R23, R32, R41, R125, R134a, R143a, R152a, R227ea, R236ea, R236fa, R245ca, and R245fa
• The HCFCs R22, R123, R124, R141b, and R142b
• The traditional CFCs R11, R12, R13, R113, R114, and R115
• The fluorocarbons R14, R116, R218, and RC318
• The "natural" refrigerants ammonia, carbon dioxide, propane, isobutane, and propylene
• The main air constituents nitrogen, oxygen, and argon
• The light natural gas constituents methane, ethane, propane, butane, and isobutane
• Water (as a pure fluid, or mixed with ammonia)
• 35 predefined mixtures (such as R407C, R410A, and Air); the user may define and store others

Registered users can obtain additional fluid files by contacting Eric Lemmon at ericl@boulder.nist.gov

The most accurate pure fluid equations of state currently available:

• High accuracy Helmholtz energy equations of state, including international standard equations for water, R134a, R32, and R143a and equations from the literature for R22, R125, ammonia, carbon dioxide, and others
• High accuracy MBWR equations of state, including the international standard EOS for R123
• The Bender equation of state for several of the "older" refrigerants, including R14, R114, and RC318
• An extended corresponding states model for fluids with limited data

Mixture thermodynamic models:

• Mixture properties are calculated with a new Helmholtz energy model.
• Experimentally based values of the mixture parameters in this model are available for 145 mixtures.

Transport equations:

• Viscosity and thermal conductivity are based on fluid-specific correlations (where available) or a modification of the extended corresponding states model.

Available properties:

• Temperature, Pressure, Density, Energy, Enthalpy, Entropy, Cv, Cp, Sound Speed, Compressibility Factor, Joule Thompson Coefficient, Quality, 2nd Virial Coefficient, 3rd Virial Coefficient, Helmholtz Energy, Gibbs Energy, Heat of Vaporization, Fugacity, Fugacity Coefficient, K value, Molar Mass, Thermal Conductivity, Viscosity, Kinematic Viscosity, Thermal Diffusivity, Prandtl Number, Surface Tension, Isothermal Compressibility, Volume Expansivity, Isentropic Coefficient, Adiabatic Compressibility, Specific Heat Input, Exergy, dp/dr, d²p/dr², dp/dT, dr/dT, dr/dp

A revised, Windows^TM-based, graphical user interface:

• The fluid or mixture, units, reference state, properties to be displayed (among the 49 available), and other options are specified via pull down menus.
• A wide variety of data tables - in a scrollable, spreadsheet style format - may be calculated, including saturation properties (with temperature, pressure, composition, or quality as the independent variable) and tables at constant temperature, pressure, density, volume, enthalpy, or entropy (with temperature, pressure, or density varied).
• Sets of independent variables may be read from a file.
• Data in any table may be copied to the clipboard for export to other programs (such as spreadsheets).
• Data in any table may be plotted.
• A wide variety of property diagrams may be automatically generated, including pressure-enthalpy and temperature-entropy diagrams and (for binary mixtures) temperature-composition and pressure-composition plots.
• Sets of user preferences and entire sessions may be stored for later use.
• A complete on-line help system is available.

Source code: The FORTRAN subroutines and associated fluid data files are provided for those wishing to access REFPROP properties from their own applications.

Excel spreadsheets:  A sample spreadsheet is included that demonstrates the linkage between Excel and the REFPROP DLL.

System Requirements: PC running Windows^TM 95, 98, 2000, NT 4.0 Me or XP operating system; Pentium processor (or 486 with math coprocessor) required; 8.0 MB available hard disk space.

Price: $200.00 for Version 7.0; $100.00 to upgrade from any previous version of REFPROP. Multiple copy discounts are available. Call for information regarding distribution licensing.

To order online, click here

You may browse the Users' Guide to see how this database works.

Please click here to view the PDF version of Users' Guide

For more information please contact:

Standard Reference Data Program
National Institute of Standards and Technology
100 Bureau Dr., Stop 2310
Gaithersburg, MD 20899-2310

(301) 975-2008 (VOICE)/ (301) 926-0416 (FAX)
Contact Us (E-MAIL)

The scientific contact for the database:

Eric W. Lemmon
Physical and Chemical Properties Division
National Institute of Standards and Technology
Boulder, CO 80305-3328
(303) 497-7939
ericl@boulder.nist.gov

 

Keywords: air; alternative refrigerants; ammonia; CFC; chemical engineering; chemistry; chlorofluorocarbons; hydrochlorofluorocarbons; equation of state; fluids; HCFC; HFC; mechanical engineering; mixtures; refrigerants; thermodynamic property; thermodynamics; thermophysics; transport property.