91 Free | Refprop

When you search Google or torrent sites for "refprop 91 free," you will find links to executable files, keygens, and patch files. Here is what you are actually downloading:

No, the official, full-featured REFPROP 9.1 is not free.

NIST maintains REFPROP as a commercial product. As of the last pricing models, a single-user license for REFPROP costs several hundred dollars (around $325–$500 depending on the version and institutional discounts). A site license can cost thousands.

However, confusion arises because NIST offers a free version called REFPROP Demo. This demo is often mistaken for the full version.

REFPROP 9.1 is an update to the Version 9 series. It is a computer program that provides high-accuracy thermophysical properties for a wide variety of industrially important fluids and fluid mixtures.

For years, this version was the gold standard for engineers who needed to calculate properties like: refprop 91 free

While you may find links claiming “REFPROP 9.1 free,” they are unauthorized copies. For legitimate engineering work, consider using CoolProp (free, open-source) or purchasing the latest REFPROP from NIST. If you need help setting up CoolProp or using NIST’s free online tools, I’m happy to provide a guide.

Would you like a tutorial on CoolProp as a legal alternative?

REFPROP 9.1 is a proprietary software developed by the National Institute of Standards and Technology (NIST) and is not officially available for free. It is a high-accuracy computational tool used to calculate the thermophysical properties of industrially important fluids and their mixtures. 1. Official Free Version (REFPROP Mini)

While the full version of REFPROP 9.1 is a paid resource, NIST offers a free student version known as REFPROP Mini.

Functionality: It is a "stripped-down" version intended for teaching thermodynamics. When you search Google or torrent sites for

Limitations: It typically includes only a limited selection of fluids (like water, air, and some refrigerants) and fewer calculation features compared to the full database.

How to Get It: It can be found by searching for "mini refprop" on the NIST website or through university resources. 2. Pricing and Licensing for Full Versions

If you require the full capabilities of the software, you must purchase a license:

Full License (Version 10): The current standard release (Version 10) costs $325.00 for a single-user license.

Upgrades: Users with a valid license for older versions like 9.x can upgrade to the latest version for approximately $125.00. As of the last pricing models, a single-user

Site Licenses: Options are available for corporate or academic institutions, with pricing based on the number of users. 3. Key Features of REFPROP 9.1

This specific version includes several technical enhancements over its predecessors:

With Version 10 and 11 available, why the interest in 9.1?

Let’s assume you find a legitimate-looking download of REFPROP 9.1 from an archive (e.g., a former student’s Google Drive). Even if the file is clean, consider these points:

REFPROP, developed by the National Institute of Standards and Technology (NIST), is a comprehensive software package that provides detailed property data for refrigerants, including thermodynamic properties, transport properties, and phase equilibrium data. It's essential for engineers and researchers working with fluid dynamics, HVAC (heating, ventilation, and air conditioning), refrigeration, and chemical engineering.

When you search Google or torrent sites for "refprop 91 free," you will find links to executable files, keygens, and patch files. Here is what you are actually downloading:

No, the official, full-featured REFPROP 9.1 is not free.

NIST maintains REFPROP as a commercial product. As of the last pricing models, a single-user license for REFPROP costs several hundred dollars (around $325–$500 depending on the version and institutional discounts). A site license can cost thousands.

However, confusion arises because NIST offers a free version called REFPROP Demo. This demo is often mistaken for the full version.

REFPROP 9.1 is an update to the Version 9 series. It is a computer program that provides high-accuracy thermophysical properties for a wide variety of industrially important fluids and fluid mixtures.

For years, this version was the gold standard for engineers who needed to calculate properties like:

While you may find links claiming “REFPROP 9.1 free,” they are unauthorized copies. For legitimate engineering work, consider using CoolProp (free, open-source) or purchasing the latest REFPROP from NIST. If you need help setting up CoolProp or using NIST’s free online tools, I’m happy to provide a guide.

Would you like a tutorial on CoolProp as a legal alternative?

REFPROP 9.1 is a proprietary software developed by the National Institute of Standards and Technology (NIST) and is not officially available for free. It is a high-accuracy computational tool used to calculate the thermophysical properties of industrially important fluids and their mixtures. 1. Official Free Version (REFPROP Mini)

While the full version of REFPROP 9.1 is a paid resource, NIST offers a free student version known as REFPROP Mini.

Functionality: It is a "stripped-down" version intended for teaching thermodynamics.

Limitations: It typically includes only a limited selection of fluids (like water, air, and some refrigerants) and fewer calculation features compared to the full database.

How to Get It: It can be found by searching for "mini refprop" on the NIST website or through university resources. 2. Pricing and Licensing for Full Versions

If you require the full capabilities of the software, you must purchase a license:

Full License (Version 10): The current standard release (Version 10) costs $325.00 for a single-user license.

Upgrades: Users with a valid license for older versions like 9.x can upgrade to the latest version for approximately $125.00.

Site Licenses: Options are available for corporate or academic institutions, with pricing based on the number of users. 3. Key Features of REFPROP 9.1

This specific version includes several technical enhancements over its predecessors:

With Version 10 and 11 available, why the interest in 9.1?

Let’s assume you find a legitimate-looking download of REFPROP 9.1 from an archive (e.g., a former student’s Google Drive). Even if the file is clean, consider these points:

REFPROP, developed by the National Institute of Standards and Technology (NIST), is a comprehensive software package that provides detailed property data for refrigerants, including thermodynamic properties, transport properties, and phase equilibrium data. It's essential for engineers and researchers working with fluid dynamics, HVAC (heating, ventilation, and air conditioning), refrigeration, and chemical engineering.

Help DeskIT ServicesSoftware