Effective 2024-07-01, Seequent will introduce updated Annual Maintenance policies for GeoStudio products.

From this date, GeoStudio perpetual licenses that are not current on maintenance will become machine-locked to the computer or server where the software is installed.

This means they cannot be moved to another device or restored to the current device in the event of, but not limited to, software failure, virtual machine re-hosting, formatted hard drive and so forth.
announcement close button
Home > refprop 91 install > refprop 91 install

Refprop 91 Install Fixed (2025)

Tip : If you plan to interface REFPROP heavily with third-party tools like Python or MATLAB, consider changing this path to a simpler, non-protected directory like C:\REFPROP . This avoids Windows permission issues later.

Integrating REFPROP 9.1 into your workflow requires a proper installation sequence, environment configuration, and linking to external software like MATLAB, Python, Excel, or LabVIEW. This guide provides a complete walkthrough to install and set up REFPROP 9.1 seamlessly. 1. Prerequisites and System Requirements

Installing and enabling features for usually refers to setting up its integration wrappers (like the Excel Add-in) or ensuring the DLL and fluid files are correctly linked. How to Install the REFPROP 9.1 Excel Add-in

Find the setup executable, usually named REFPROP91.EXE or Setup.exe .

Administrative rights are required to write to the C:\Program Files (x86) directory and edit system environment variables. refprop 91 install

Open Excel and go to File > Options > Trust Center > Trust Center Settings .

This comprehensive guide covers the step-by-step installation process for REFPROP 9.1, environment configuration, and integration with popular platforms like Excel, MATLAB, and Python. System Requirements and Prerequisites

Solution: REFPROP 9.1 includes both 32-bit ( refprop.dll ) and 64-bit ( refprop64.dll ) binaries. If your IDE or Excel architecture is 64-bit, ensure your code explicitly targets the 64-bit version of the DLL.

REFPROP 9.1 is a widely used software for calculating the thermodynamic and transport properties of industrial fluids, refrigerants, and hydrocarbons. Its accuracy is crucial for engineers, researchers, and developers in HVAC, chemical processing, and aerospace fields. Tip : If you plan to interface REFPROP

: Windows XP through Windows 11 (32-bit or 64-bit).

REFPROP's true utility comes from its API hooks into programming languages and spreadsheet software. Here is how to configure the most common integrations. 1. Microsoft Excel Integration

macOS (requires compilation via GCC/GFortran or compatibility layers). Administrative Privileges

Right-click the setup executable and select "Run as administrator." This is crucial; failing to do so may result in the software being unable to write necessary files to the system directories. This guide provides a complete walkthrough to install

Under , click New to create a variable linking directly to your fluid files: Variable name: RPPREFIX

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.

The primary REFPROP application is a Windows program. However, its core calculation engine (the DLL/shared library) can be used on other operating systems by running it within specific software environments. For instance, for the on macOS or Linux, a specific installation structure is required. This involves creating a refprop folder in your home directory and placing the fluids, mixtures, shared library, and header file within it. This setup is for developers and advanced users only and is not a standalone installation of the REFPROP program.

| Problem | Possible Cause | Solution | | :--- | :--- | :--- | | (e.g., trying to install v10 but v9.1 remains) | Leftover files from an older incomplete uninstallation | Perform a thorough manual cleanup as detailed in the Pre-Installation section, then reinstall | | Old DLL conflicts | An older REFPROP.DLL from version 7.0 or 8.0 is present in C:\Windows\System32 | Manually search for and delete any REFPROP.DLL in the C:\Windows\System32 folder (be very careful not to delete other system files) | | Excel linking fails | Missing 64-bit DLL or incorrect environment variables | Ensure REFPRP64.dll is in the REFPROP folder. If needed, set the RPprefix environment variable to your REFPROP installation path | | "Flash calculation" errors in mixtures | Using base version 9.1 instead of the updated 9.1.1 | Download and install the free 9.1.1 patch from NIST. Using 9.1 can lead to non-deterministic calculation behaviors | | MATLAB linking fails with "invalid MEX-file" | Using 64-bit MATLAB but missing the 64-bit thunking file | If not using the 9.1.1 patch, manually obtain REFPRP64_thunk_pcwin64.dll and rp_proto64.m and place them in the REFPROP directory |

close button refprop 91 install
scroll to top icon