91 Install - Refprop

How to Install REFPROP 9.1: A Complete Step-by-Step Guide REFPROP (Reference Fluid Thermodynamic and Transport Properties), developed by NIST, is the gold standard for scientists and engineers needing accurate properties of industrially important fluids and mixtures. While newer versions exist, REFPROP 9.1 remains widely used in legacy academic environments and specific industrial workflows.

If you need to get REFPROP 9.1 up and running on your machine, follow this comprehensive installation and setup guide. 1. System Requirements & Prerequisites Before beginning, ensure your system meets the following:

OS: Windows XP through Windows 11 (REFPROP is natively a Windows application).

Permissions: Administrative privileges are required to write to the C:\Program Files (x86) directory.

Media: You must have the original installation files (usually an .exe installer or a folder containing SETUP.EXE). 2. Step-by-Step Installation Process Step 1: Run the Installer

Locate your REFPROP 9.1 installation file (often named REFPROP91.EXE or found within a disk image). Right-click the installer and select Run as Administrator. The InstallShield Wizard will launch. Click Next. Step 2: License Agreement and User Info

Read and accept the NIST license agreement. Enter your User Name and Organization when prompted. Step 3: Choose Destination Location

By default, the software installs to:C:\Program Files (x86)\REFPROP

Pro Tip: If you plan on using REFPROP frequently with Python, MATLAB, or Excel, some users prefer installing it to a shorter path like C:\REFPROP to avoid issues with spaces in file paths during API calls. Step 4: Complete the Installation

Follow the remaining prompts and click Install. Once finished, click Finish. You should now see a REFPROP icon on your desktop. 3. Post-Installation Configuration

Installing the software is only the first half. To make it useful, you usually need to link it to other tools. Adding REFPROP to System Environment Variables

To call REFPROP from any command line or external program, add it to your System Path:

Search for "Edit the system environment variables" in your Windows Start menu. Click Environment Variables.

Under "System variables," find Path, select it, and click Edit.

Click New and paste your installation path (e.g., C:\Program Files (x86)\REFPROP). Click OK on all windows. 4. Integrating with Third-Party Software Excel Integration Open Excel and go to File > Options > Add-ins. At the bottom, select Excel Add-ins and click Go. Click Browse and navigate to your REFPROP folder. Select REFPROP.xla (for older Excel) or REFPROP.xlam.

Ensure "Refprop" is checked in the list. You can now use functions like =PropSI(...). MATLAB Integration

Copy the refpropm.m file from the scripts folder in your REFPROP directory to your MATLAB work folder. You will also need to ensure the REFPROP.DLL is accessible in the system path. Python (CoolProp Wrapper)

Most Python users utilize the wrapper provided by CoolProp to access REFPROP 9.1: pip install CoreProp Use code with caution.

In your script, you will point the wrapper to your C:\Program Files (x86)\REFPROP directory to load the high-accuracy NIST fluid files. 5. Troubleshooting Common Issues

"DLL Not Found" Error: This usually means the system cannot find REFPROP.DLL. Ensure the installation folder is correctly added to your Windows System Path (see Section 3).

Fluid File Errors: If you get an error saying a fluid file (like NITROGEN.FLD) is missing, ensure you are running the application from the directory where the /fluids/ folder is located.

Excel Macros Blocked: If the Excel functions don't work, go to Trust Center > Trust Center Settings > Macro Settings and ensure "Enable all macros" (or "Disable with notification") is selected.

Installing REFPROP 9.1 is a straightforward process, but its utility depends on correct pathing and integration with your calculation tools. By following the steps above, you’ll have a robust thermodynamic engine ready for complex fluid analysis.

Installing NIST REFPROP 9.1 typically involves the base software installation on Windows followed by linking the Dynamic Link Library (DLL) to applications like Excel, MATLAB, or Python. 1. Core Software Installation (Windows) REFPROP 9.1 is a licensed software provided by NIST. Run the Installer refprop 91 install

: Use the executable provided with your purchase (often via CD-ROM or digital download). Default Directory : By default, it installs to C:\Program Files (x86)\REFPROP

. It is highly recommended to keep this path, as many third-party wrappers look for it there by default. Verification : After installation, open the REFPROP.EXE

(Graphical User Interface) to ensure the fluid files and mixture models load correctly. National Institute of Standards and Technology (.gov) 2. Linking to Microsoft Excel

The most common use case for version 9.1 is within Excel via the Locate the Add-in REFPROP.XLS in your installation folder. Save a copy as REFPROP.XLA REFPROP.XLAM to your local "Add-ins" folder. Set Trusted Locations Open Excel and go to File > Options > Trust Center > Trust Center Settings Trusted Locations and add the folder C:\Program Files (x86)\REFPROP Activate the Add-in File > Options > Add-Ins In the "Manage" dropdown at the bottom, select Excel Add-ins (or browse to find the file if it's not listed). Fixing DLL Links : If functions return errors, press to open the Visual Basic Editor. Check if the path to REFPROP.DLL in the module matches your actual installation path. National Institute of Standards and Technology (.gov) 3. Installation on macOS

Because REFPROP is a Windows-based Fortran program, macOS users must use a wrapper. Directory Setup : Create a folder named /Users/$USER/Library/Group Containers/UBF8T346G9.Office/ Copy Files : Copy your folders (must be capitalized) and the librefprop.dylib file into this new folder. Excel Setup REFPRP91.XLA

file specifically designed for Mac, which can be found in the NIST REFPROP-wrappers GitHub 4. Troubleshooting Common Issues Missing Fluids : Ensure the subdirectories are present in the main REFPROP folder. Path Environment Variable : If calling REFPROP from Python or MATLAB, adding C:\Program Files (x86)\REFPROP to your Windows System Environment Variables (Path) often resolves "DLL not found" errors. 32-bit vs 64-bit

: Ensure your Excel version (32 or 64-bit) matches the DLL version you are calling. REFPROP 9.1 typically provides both REFPROP.DLL (32-bit) and REFPRP64.DLL CoolProp can't load REFPROP v10 mixtures on Debian 9 #1829

Integrating REFPROP 9.1 (Reference Fluid Thermodynamic and Transport Properties) is a straightforward process, but it requires precise file placement to ensure it communicates correctly with external software like Excel, MATLAB, or Python. 1. Initial Extraction and Setup

The installation typically begins with the executable provided by NIST. Run the installer to unpack the high-accuracy property models and the graphical user interface. By default, the program installs to C:\Program Files (x86)\REFPROP

If you plan on using REFPROP with third-party wrappers (like Python’s

), many users prefer installing it to a simpler path without spaces, such as C:\REFPROP , to avoid path-string errors in code. 2. Linking the DLL The core of REFPROP is the REFPROP.DLL file. For the software to be "visible" to your system: System Environment Variables: Add the REFPROP installation folder to your Windows

. This allows other programs to call the DLL without you having to copy the file into every project folder. 32-bit vs. 64-bit:

Ensure you are using the version of the DLL that matches your calling application. REFPROP 9.1 includes both; the 64-bit version is often named REFPRP64.DLL 3. Integration with Excel To use REFPROP functions directly in spreadsheets: Open Excel and go to Options > Add-ins Excel Add-ins Browse to your REFPROP directory and select REFPROP.xlam Refprop.xla for older versions). Once enabled, you can use formulas like =Theoretical("T","Density", "SI", "Water") directly in cells. 4. Verification After installation, always run the standalone REFPROP GUI

first. If you can calculate a simple saturation table for a common fluid like Nitrogen, the underlying fluid files (.FLD) and mixture files (.MIX) are correctly placed. Are you planning to use REFPROP primarily through the Excel Add-in or via a programming language like

REFPROP 91 Installation and Overview

Introduction

REFPROP (Reference Properties) is a comprehensive thermodynamic property database developed by the National Institute of Standards and Technology (NIST). REFPROP 91 is the latest version of this software, which provides accurate and reliable thermophysical property data for a wide range of pure fluids and mixtures. This write-up provides a detailed overview of the REFPROP 91 installation process and its key features.

System Requirements

Before installing REFPROP 91, ensure that your system meets the following requirements:

Installation Steps

  1. Download REFPROP 91: Visit the NIST website (https://physics.nist.gov) and navigate to the REFPROP download page. Select the version compatible with your operating system (Windows or macOS).
  2. Run the Installer: Once the download is complete, run the installer (.exe file for Windows or .dmg file for macOS). Follow the prompts to begin the installation process.
  3. License Agreement: Read and accept the license agreement.
  4. Choose Installation Location: Select the installation directory (default location: C:\Program Files\REFPROP on Windows or Applications/REFPROP on macOS).
  5. Select Components: Choose the components to install, including the REFPROP executable, property data, and any additional languages.
  6. Installation: The installer will copy the necessary files to your system.
  7. Activation: Upon first launch, REFPROP 91 will prompt for activation. Follow the on-screen instructions to activate the software using the provided license key.

Post-Installation

After installation, REFPROP 91 can be launched from the Start menu (Windows) or Applications folder (macOS). The software's graphical user interface (GUI) provides access to various features, including:

  1. Fluid Selection: Choose from a list of over 1,300 pure fluids and mixtures.
  2. Property Calculations: Calculate thermophysical properties, such as density, viscosity, and thermal conductivity.
  3. Phase Diagrams: Generate phase diagrams for pure fluids and mixtures.
  4. Data Export: Export calculated properties and phase diagram data to various formats (e.g., CSV, Excel).

Key Features

REFPROP 91 offers several key features:

  1. Accurate Property Data: REFPROP provides accurate and reliable thermophysical property data, based on internationally accepted standards.
  2. Comprehensive Fluid List: The software includes a vast list of pure fluids and mixtures, including refrigerants, hydrocarbons, and other common substances.
  3. User-Friendly Interface: The GUI is intuitive and easy to navigate, making it simple to perform calculations and generate phase diagrams.
  4. Export Options: Calculated properties and phase diagram data can be exported to various formats for further analysis.

Troubleshooting

If you encounter issues during installation or while using REFPROP 91, consult the NIST support resources:

  1. User Manual: Refer to the comprehensive user manual for detailed instructions and troubleshooting guides.
  2. FAQs: Visit the NIST REFPROP FAQ page for answers to common questions.
  3. Support Email: Contact NIST support via email for assistance with installation or technical issues.

Conclusion

REFPROP 91 is a powerful tool for calculating thermophysical properties of pure fluids and mixtures. By following the installation steps outlined above, users can easily install and activate the software. With its comprehensive fluid list, accurate property data, and user-friendly interface, REFPROP 91 is an essential resource for researchers, engineers, and students working with thermodynamic properties.

Guide to Installing NIST REFPROP 9.1 NIST REFPROP (Reference Fluid Thermodynamic and Transport Properties) version 9.1 is a widely used software for calculating the thermophysical properties of industrially important fluids and their mixtures. While it has been officially superseded by REFPROP Version 10

, many researchers and engineers continue to use version 9.1 for consistency with older projects. System Requirements

Before beginning the installation, ensure your system meets these basic requirements: Operating System

: Windows 98, 2000, XP, Vista, 7, 8, or similar (both 32-bit and 64-bit are supported). Disk Space : Approximately 10–20 MB of available hard disk space. Core Installation Procedure

The standard installation typically involves a setup executable provided by NIST. Run the Installer : Locate your installation file (often named nist2391.exe or found on a provided CD-ROM). Follow the Wizard

: Execute the file and follow the on-screen prompts. The default installation path is usually C:\Program Files\REFPROP

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

: To access REFPROP from other applications, you may need to set specific environment variables:

: Set this variable to point to your main installation directory (e.g., C:\Program Files\REFPROP

: Add the REFPROP directory to your system's "Path" variable to allow the system to locate the REFPROP.DLL Linking REFPROP 9.1 with Microsoft Excel

One of the most common ways to use REFPROP 9.1 is through its Excel Add-in. Locate Add-in Files REFPRP91.XLA REFPROP.xlam is in your main installation folder. Add Trusted Location In Excel, go to

File > Options > Trust Center > Trust Center Settings > Trusted Locations C:\Program Files\REFPROP as a trusted location to ensure macros can run. Activate the Add-in File > Options > Add-ins At the bottom, select Excel Add-ins from the "Manage" dropdown and click Browse to your REFPROP folder and select the Verify the Connection : Test a simple command in a cell, such as =Density("water","TP","SI",300,1) , to ensure properties are being pulled correctly. Troubleshooting Common Issues Answers to Frequently Asked Questions - NIST Pages

How to Install and Set Up NIST REFPROP 9.1 NIST REFPROP 9.1 is a specialized database for calculating the thermodynamic and transport properties of industrially important fluids and mixtures. Released by the National Institute of Standards and Technology (NIST), version 9.1 introduced key updates like 121 pure fluids and a 64-bit DLL (REFPRP64.dll) for improved integration with modern applications. 1. System Requirements

Before installation, ensure your PC meets these minimum specifications:

Operating System: Windows XP, 7, 8, 10, or 11 (32-bit or 64-bit). Storage: At least 10–20 MB of available hard disk space. 2. Standard Installation Steps

To install the full version of REFPROP 9.1 on a Windows machine:

Run the Setup: Locate your installation file (typically named nist2391.exe for version 9.1) or insert the REFPROP CD-ROM.

Follow the Wizard: Execute the installer and follow the on-screen prompts. How to Install REFPROP 9

Default Directory: The software installs by default to C:\Program Files (x86)\REFPROP on 64-bit systems or C:\Program Files\REFPROP on 32-bit systems.

Registration: For specialized 64-bit COM object registration, you may need to run regsvr32.exe refpropco64.dll at a command prompt. 3. Setting Up the Excel Add-In

One of the most common ways to use REFPROP is within Microsoft Excel. To link version 9.1 to Excel: Linking REFPROP with Other Applications

Once upon a time in the high-stakes world of thermodynamic research, an engineer named Sarah faced a daunting challenge. Her mission: install REFPROP 9.1 , the legendary software from

used to calculate the properties of industrially vital fluids. The Quest for the Installer

Sarah’s journey began with a search for the sacred installation files. Unlike modern apps, REFPROP 9.1 often arrived on a physical CD-ROM. She inserted the disc and carefully ran the installer, watching as it carved out its home in C:\Program Files\REFPROP

. For those without the full version, a "mini" version was sometimes used as a starter. The Excel Trial

The real test came when Sarah tried to link REFPROP to Excel. She knew this was no simple task—it required the precision of a master builder. The Add-In: She located the REFPROP.xlam REFPRP91.XLA

) file and meticulously moved it to a trusted folder, avoiding the treacherous default path that Excel often rejected. The Connection: Through the Excel

menu, she browsed to her folder and enabled the link, ensuring the "Refprp91" box was checked. The Proof: She typed a magic formula: =Density("water","TP","SI",300,1)

. When the cell returned a perfect value instead of an error, she knew the bond was sealed. The Shadow of the Past

Later, Sarah faced a "ghost" from her installation. When she eventually upgraded to Version 10

, the old Version 9.1 wouldn't leave quietly. To banish it, she had to perform a ritualistic "clean uninstall," hunting down hidden folders in and deleting lingering files from her system path. me4293 download and setup mini refprop for students 24-Sept-2020 —

Frequently Asked Questions (FAQ) About REFPROP 9.1 Install

Q: Can I install REFPROP 9.1 on Windows 11?
A: Possibly, but it is not officially supported. Users report success using Windows 10 compatibility mode (right-click installer > Properties > Compatibility > Run as Windows 10).

Q: I lost my license file. Can NIST reissue it for version 9.1?
A: Likely not. NIST strongly encourages upgrading. If you have proof of purchase, contact refprop@nist.gov – but be prepared for a “no.”

Q: Does REFPROP 9.1 include mixtures?
A: Yes, it supports binary and pseudo-binary mixtures. Use the “Mixture” menu in the GUI or the REFPROPm DLL.

Q: Why does the installer ask for a disk 2?
A: Some CD distributions of REFPROP 9.1 span two disks. Download the full ISO or copy both disk images to the same folder.

Q: Is there a silent install for enterprise deployment?
A: Not natively. You can use AutoIt scripts or response files if you extract the MSI using Universal Silent Switch Finder.

EES (Engineering Equation Solver)

EES has a built-in REFPROP call. After installation, simply write:

rho = Density(Water, T=300, P=101.3)

Ensure EES points to the correct REFPROP version via Options > REFPROP Path.

Common REFPROP 9.1 Installation Problems and Fixes

Even following the steps perfectly, you may encounter errors. Here are the most frequent issues with refprop 91 install and their solutions.

Step 4: Select Components

The installer usually presents a "Custom" or "Complete" setup.

Step 5 – Enter Licensing Information

Here is where many refprop 91 install attempts fail. You will see one of two screens: Operating System: Windows 10 (or later), Windows 7

If you no longer have your serial or license file, unfortunately, you cannot complete the installation. Contact NIST’s REFPROP support, but note they may not support version 9.1 in 2025.