Refprop 91 Install Fixed -

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: It is recommended to keep this default path as many external wrappers (like Excel) look for this specific directory. Environment Variables (Optional but Recommended)

Version 9.1, released in 2013, was a significant update. It enhanced most areas of the program, including its graphical interface, Excel spreadsheet integration, FORTRAN core routines, and sample code for other programming languages like C++ and MATLAB.

Restart your computer or your command prompt/IDE for the changes to take effect. Connecting REFPROP 9.1 to External Software

REFPROP 9.1 has numerous applications in: refprop 91 install

Choose unless you have a specific reason not to.

A: Likely not. NIST strongly encourages upgrading. If you have proof of purchase, contact refprop@nist.gov – but be prepared for a “no.”

: The installer was partially downloaded or modified. Solution : Obtain a fresh copy from your original backup or a trusted source. Compare the MD5 checksum with NIST’s archive if available.

Run Command Prompt as administrator.

Example: density = refpropm('D', 'T', 300, 'P', 101.325, 'water')

Right-click the installer executable and select . Click Next on the welcome screen. Step 2: Accept the License Agreement Read the NIST end-user license agreement. Select I accept the agreement and click Next . Step 3: Choose Destination Location

If using the CAPE-OPEN interface or certain COM objects, you may need to manually register the DLL using regsvr32.exe refpropco.dll in a command prompt. 3. Integrating with Excel

Are you planning to use primarily for Excel macros or as a standalone GUI for fluid property tables? This public link is valid for 7 days

from ctypes import cdll, c_double refprop = cdll.LoadLibrary(r'C:\Program Files (x86)\REFPROP\REFPROP.dll')

Critical Tip: If you plan to connect REFPROP to Python, MATLAB, or Excel, consider changing this path to a simpler directory without spaces, such as C:\REFPROP . This prevents file path parsing errors in external scripts.

Microsoft Excel (optional, for using the REFPROP Excel Add-in).

Even following the steps perfectly, you may encounter errors. Here are the most frequent issues with and their solutions. Can’t copy the link right now