Refprop 91 Install Guide
Before starting the installation, ensure your system meets the requirements: Windows 7, 8, 10, or 11 ( Disk Space: Approximately MB of free space.
Run-time errors like MSHFLXGD.OCX missing often mean a firewall or antivirus blocked the registration of UI components.
Open Excel and go to File > Options > Trust Center > Trust Center Settings .
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REFPROP, short for erence Fluid PROP erties, is a program developed and distributed by the National Institute of Standards and Technology (NIST) as Standard Reference Database 23 (SRD 23). It is a cornerstone for engineers and scientists working with refrigerants, hydrocarbons, natural gas, and other industrially important fluids, particularly in fields like HVAC&R, chemical engineering, and energy systems.
Once the progress bar finishes, click . The standalone REFPROP graphical user interface (GUI) is now ready to use. You can test it by opening the application from your Start Menu and calculating properties for a simple fluid like Water or R134a. 3. Configuring System Environment Variables
Click Install and wait for the process to finish. Click Finish to close the setup wizard. Step 2: Configuring System Environment Variables Before starting the installation, ensure your system meets
This happens if the program doesn't know where the /fluids folder is. Go to the REFPROP GUI, select Options > Paths , and ensure the path points to your installation folder.
Select a fluid (e.g., Water) and calculate a property. If the result appears, installation is successful.
Version 9.1, released in 2013, was a major update that expanded the database to . The introduction of a 64-bit DLL significantly improved performance for complex calculations and integration with modern software like Excel and MATLAB. While newer versions exist, 9.1 remains a widely used and stable standard in many engineering and academic settings. This public link is valid for 7 days
Note: Even on 64-bit Windows, REFPROP 9.1 installs to the Program Files (x86) folder because it is a 32-bit application.
NIST REFPROP (Reference Fluid Thermodynamic and Transport Properties) is the industry standard for calculating the thermophysical properties of fluids. While REFPROP 10 is the latest edition, version 9.1 remains widely used in engineering labs, academic research, and legacy industrial pipelines.
The default location is C:\Program Files (x86)\REFPROP or C:\REFPROP .
Windows requires administrator rights to write to the C:\Program Files (x86) directory and to modify System Environment Variables.
Press the , type Environment Variables , and select Edit the system environment variables .
