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How to Install REFPROP

edited April 2015

This manual will guide you through the process of REFPROP installation. By the end of this process you should be able to call REFPROP functions from within MS Excel. If you already have REFPROP installed and it works with Excel (i.e. you can put something like =Density('air','PT','SI',0.101325,300) in excel spreadsheet and the function will return the result), you can completely ignore this manual.

System Requirements

  • Operating System: Windows XP; Windows 7; Windows 8.
  • Microsoft Office: MS Office 2007; MS Office 2010; MS Office 2013.
  • Mathcad: The only supporting version is Mathcad 15.

Installation Process

  1. Install REFPROP using the setup launcher with default settings.

  2. Download and execute batch command file corresponding to your version of operating system (32-bit or 64-bit) from this zip-archive (link). If you have both C:\Program Files and C:\Program Files (x86) folders on your computer, you have 64 bit version. If you have only C:\Program Files folder, your version is 32-bit. Windows XP is usually 32-bit, Windows 7 and Windows 8 are usually 64-bit.

    You may have a warning that the file could be dangerous because it contains executable batch files. If you don't trust me (and probably you shouldn't) you can add the following paths to your environment variables manually. To do this, follow the steps:

    • Open Control Panel, switch to Classic View in Windows XP or to View by Small icons in Windows 7 and Windows 8.
    • Click the System icon.
    • For Windows 7 and Windows 8: in the left pane, click Advanced system settings.
    • On the Advanced tab, click Environment Variables.

    Add the following variables to your User variables section:

    variable path (Windows 32-bit) path (Windows 64-bit)
    path C:\Program Files\REFPROP C:\Program Files (x86)\REFPROP
    RPPrefix C:\Program Files\REFPROP C:\Program Files (x86)\REFPROP

    If you already have path variable in your User variables section, simply add an extra path to the end of the line separated by semi-colon sign, i.e. C:\Windows\system32;C:\Windows;C:\Program Files (x86)\REFPROP

  3. Open REFPROP.xls file from default REFPROP installation directory (C:\Program Files\REFPROP\ for Windows 32-bit, C:\Program Files (x86)\REFPROP\ for Windows 64-bit).

    Go to the File/Save As… option in Excel and select Microsoft Office Excel Add-In under the Save as type section. This will change the extension to .XLAM. If the default filename becomes Copy of REFPROP.xlam change it to REFPROP.xlam. Save the file as REFPROP.xlam simply clicking to the Save button. Don't change the directory, keep a default path.

  4. Choose Add-Ins tab and click to the Go... button.

    In Add-Ins window put a checkmark next to REFPROP AddIns and click OK.

  5. To verify that you are done with REFPROP installation, open a new Excel document and type =density("air","PT","SI",0.1,300) in any cell (or just copy-paste that).

    If everything is OK you should see 1.161299 value when you press ENTER key. The value shows density of air in kg/m^3 at 0.1MPa pressure and 300K temperature.

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