Refprop 10 (Reference Fluid Thermodynamic and Transport Properties) is the gold standard software developed by NIST for calculating the properties of industrial fluids. If you are searching for a "refprop 10 free download 2021," it is important to understand the software’s licensing, its capabilities, and how to access it legitimately. What is NIST Refprop 10?
Refprop is used by engineers and researchers to obtain highly accurate data on refrigerant mixtures, hydrocarbons, and common inorganic fluids. Version 10 introduced significant upgrades, including:
New equations of state for ammonia, carbon dioxide, and helium.
Improved calculation speeds for complex mixture flash routines. Enhanced Excel Add-in features for better data integration. Expanded library of natural and synthetic refrigerants. The Reality of Free Downloads
NIST Refprop is a proprietary database. While many websites claim to offer a "free download" for the 2021 version, these often involve significant risks:
Security Threats: Unofficial installers often contain malware or trojans.
Data Inaccuracy: Cracked versions may have corrupted property tables, leading to dangerous engineering errors.
Legal Compliance: Using unlicensed software in a professional or academic setting violates copyright laws. How to Access Refprop Legally
If you need the software for your projects, there are several legitimate paths to take:
NIST Standard Reference Data (SRD) Store: The official version must be purchased through the NIST website. Once purchased, you receive a permanent license and access to updates.
Academic Licenses: Many universities provide Refprop to students and faculty through departmental licenses. Check with your university's IT or Engineering office before buying a personal copy.
Refprop Mini: NIST previously offered a "Mini-Refprop" version for free. While limited to a few fluids (like water and air), it is a safe and legal way to test the interface.
Python and MATLAB Wrappers: While the core engine is paid, many open-source wrappers (like ctREFPROP) are free to download on GitHub to help you interface with your licensed version. Alternatives to Refprop
If your budget is zero and you need thermodynamic data, consider these high-quality open-source alternatives:
CoolProp: The most popular free alternative. It is C++ based, open-source, and integrates seamlessly with Python, MATLAB, and Excel.
NIST Chemistry WebBook: A free online portal that allows you to generate property tables for various fluids without installing software.
DWSIM: A free, open-source chemical process simulator that includes built-in property packages for engineering calculations. Conclusion
While the search for a "refprop 10 free download 2021" is common, the safest and most reliable way to use this industry-standard tool is through official channels. For those who cannot afford the NIST license, CoolProp remains the best free resource for professional-grade thermodynamic calculations.
The full version of REFPROP 10 is not available for free download as it is a commercial product developed by the National Institute of Standards and Technology (NIST).
However, there is a limited free version and specific access options:
mini-REFPROP (Free): A free "sample" version designed for students and teaching. It includes a limited fluid library (e.g., water, CO2cap C cap O sub 2 , R134acap R 134 a
, nitrogen, oxygen, methane, propane, helium, hydrogen, and dodecane) and basic mixture calculations. You can download it directly from the mini-REFPROP official page. Full Version Pricing:
New License: The standard single-user license is priced at $325.00.
Upgrade: Users moving from version 9.x to 10.x can purchase an upgrade for $125.00.
Purchasing: Licenses are available through the NIST E-Commerce Store. Trial & Beta Options:
7-Day Free Trial: A trial version of the REFPROP CAPE-OPEN Property Package Manager is available, though it requires a fee after the trial ends.
Beta/Alpha Access: NIST occasionally provides beta or alpha DLLs to existing users to help debug new features.
Key 2021 Update Info: While REFPROP 10 was released in 2018, its official documentation and FAQ were significantly updated on March 29, 2021. This update introduced better Excel examples, optimized Fortran code for speed, and expanded fluid data for refrigerants like R1123 and R1233zd(E). REFPROP | NIST
While REFPROP 10 is a commercial software that requires a paid license from the National Institute of Standards and Technology (NIST), you can legally access parts of its functionality for free through several official and open-source alternatives: 1. Official "mini-REFPROP" (Free Student Version)
NIST provides a free, streamlined version called mini-REFPROP. This is designed as a teaching tool and is perfect if you only need to work with common fluids. Included Fluids: Water, CO2cap C cap O sub 2 R134acap R 134 a
, Nitrogen, Oxygen, Methane, Propane, Helium, Hydrogen, Dodecane, and Air.
Limitations: It has a limited substance library compared to the 147+ fluids in the full version and does not include technical support. 2. CoolProp (The Open-Source Alternative) If youorg/">CoolProp is the most popular free alternative. Cost: Completely free for academic and commercial use.
Compatibility: It can be called from Python, MATLAB, Excel, and C++.
Refprop Integration: If you eventually get a Refprop license, CoolProp can actually act as a wrapper to call Refprop's high-accuracy DLLs directly. 3. REFPROP 10 Pricing
If you decide you need the full professional suite, it must be purchased through the NIST E-Commerce Store: Full Single-User License: $325.00. Upgrade (from version 9.x): $125.00. Useful Implementation Tip
If you are a student, check if your university has a Site License. Many engineering departments already own a bulk license that allows students to install the full version on their personal machines for free. REFPROP 10 Single User - Shop NIST
* Standard Reference Data. * PC Databases. * REFPROP 10 Single User: Thermodynamic and Transport Properties Database. National Institute of Standards and Technology (.gov) REFPROP | NIST
The search for a "REFPROP 10 free download 2021" typically leads to the mini-REFPROP version, as the full REFPROP 10 is a paid NIST Standard Reference Database ($325 for a single-user license). The "Interesting Review" (User Perspective)
Reviewers and engineers often compare REFPROP 10 to its freeware alternative, CoolProp. An interesting consensus from Reddit's engineering community highlights why people upgrade:
Precision over Free Tools: Users report that while CoolProp is excellent, it can be "clunky" around phase boundaries. One reviewer noted REFPROP 10 was accurate within 1% for high-pressure cylinder calculations (4230 PSIG calculated vs. 4200 PSIG measured).
Ease of Use: The 10.0 version introduced a single-command function that replaces complex legacy calls (like TPFLSH), making it much easier to integrate into Excel or Python.
Speed & Convergence: The underlying Fortran code was highly optimized in version 10, resulting in faster calculation speeds and better convergence for complex mixtures. Free Options vs. Paid Version
If you are looking for a free way to use it, there are two legitimate paths:
mini-REFPROP: A free sample version intended for students. It includes 10 pure fluids (Water, CO2, R134a, Nitrogen, Oxygen, Methane, Propane, Helium, Hydrogen, and Dodecane) plus air.
Beta/Patches: NIST occasionally provides 10-BETA DLLs for existing users to help debug new features, though these usually have expiration dates. Key Version 10 Features REFPROP | NIST
REFPROP 10 Free Download 2021: A Comprehensive Guide
REFPROP, short for Reference Properties, is a widely used software tool for calculating thermodynamic properties of fluids. Developed by the National Institute of Standards and Technology (NIST), REFPROP is an essential resource for engineers, researchers, and scientists working with fluid thermodynamics. In this blog post, we will explore how to obtain REFPROP 10 for free in 2021 and provide an overview of its features and applications.
What is REFPROP 10?
REFPROP 10 is the latest version of the REFPROP software, released in 2020. This version offers improved functionality, new features, and enhanced performance compared to its predecessors. REFPROP 10 allows users to calculate various thermodynamic properties, such as density, viscosity, thermal conductivity, and specific heat capacity, for a wide range of fluids, including refrigerants, hydrocarbons, and other pure compounds.
Features of REFPROP 10
Some of the key features of REFPROP 10 include:
How to Get REFPROP 10 for Free in 2021
To obtain REFPROP 10 for free in 2021, follow these steps:
System Requirements
Before downloading and installing REFPROP 10, ensure that your computer meets the following system requirements:
Applications of REFPROP 10
REFPROP 10 has a wide range of applications in various fields, including:
Conclusion
REFPROP 10 is a powerful software tool for calculating thermodynamic properties of fluids. With its accurate calculations, wide range of fluids, and user-friendly interface, REFPROP 10 is an essential resource for engineers, researchers, and scientists working with fluid thermodynamics. By following the steps outlined in this blog post, you can obtain REFPROP 10 for free in 2021 and take advantage of its features and applications.
The full version of REFPROP 10 is a proprietary database developed by the National Institute of Standards and Technology (NIST) and is not available for free download
. While many sites may use "free download" in their titles to attract traffic, the software must be purchased through official channels to receive a legitimate license. National Institute of Standards and Technology (.gov) Official Licensing & Costs As of 2021, the following official pricing applies for REFPROP 10 at NIST Single User License for new users. for users upgrading from version 9.x to 10.x. Site Licenses : Available for organizations, with discounted pricing starting at 25 users. National Institute of Standards and Technology (.gov) Free "Sample" Version
If you are looking for a free way to test the software or use it for basic educational purposes, NIST provides a "mini" version: MINI-REFPROP : This is a free sample version intended as a teaching tool. Limitations
: It includes only a limited selection of fluids (such as water, CO2, R134a, nitrogen, oxygen, methane, propane, and helium) and does not provide technical support. : You can find it on the NIST MINI-REFPROP page Key Features of Version 10 Fluid Support
I understand you're looking for a specific software version, but I need to be clear: REFPROP 10 (from NIST) is proprietary, commercial software. There is no legitimate "free download" for the full version, especially not from 2021.
If you've seen a link or story claiming otherwise, it's almost certainly pirated software, which comes with serious risks: malware, legal liability, lack of updates, and corrupted files.
What you can do legally and safely:
If you need help with thermodynamic properties or finding a legitimate alternative for your project, I’d be glad to guide you. Just let me know what fluid or application you’re working on.
NIST REFPROP (Reference Fluid Thermodynamic and Transport Properties) is a proprietary software developed by the National Institute of Standards and Technology (NIST). not available for free download
, and searching for "free" versions often leads to sites hosting malware or pirated content.
To obtain a legitimate copy of REFPROP 10, you must purchase it through official channels: Standard Reference Data Program (NIST)
: You can buy the full version (Standard Reference Database 23) directly from the NIST website Version 10 Enhancements
: The 2021 period saw updates focused on new refrigerants and improved mixture models, which are included in the official Version 10 release. Legitimate Free Alternatives
If you need high-accuracy thermodynamic properties but do not have a budget for REFPROP, consider these open-source options:
: This is the most popular free alternative. It is an open-source library that covers a vast range of fluids and mixtures, including many of the same formulations used in REFPROP. It integrates easily with Python, MATLAB, Excel, and C++. REFPROP Mini (DLL)
: NIST sometimes provides a "Mini-REFPROP" viewer or limited DLLs for educational use, though these are restricted to a very small number of fluids (usually water, nitrogen, and R134a). Security Warning
Avoid downloading files from unofficial forums or "crack" sites claiming to offer REFPROP 10 free download 2021 . These files frequently contain: Trojans/Keyloggers : Designed to steal credentials from your workstation. Ransomware : Which can encrypt your research data. Broken DLLs
: Which can cause significant calculation errors in your engineering simulations.
full version of REFPROP 10 is not available for free download , as it is a proprietary software maintained by the National Institute of Standards and Technology (NIST) . However, a free educational version called mini-REFPROP is available for students and educators.
Below is a blog post structure designed to clarify the licensing, free alternatives, and how to legally acquire the software.
Navigating REFPROP 10: Downloads, Licenses, and Free Alternatives
If you are a chemical engineer, researcher, or student, you’ve likely come across NIST REFPROP
(Reference Fluid Thermodynamic and Transport Properties Database)
. It is the industry standard for calculating the thermodynamic and transport properties of industrially important fluids. With the release of Version 10
, many users are searching for "REFPROP 10 free download" options. Here is what you need to know about the current licensing and how to get started without breaking the bank. 1. Is there a free version of REFPROP 10? The short answer is
, the full database is a paid resource. NIST charges for the software to support the ongoing research and maintenance required for its high-accuracy models. Full Version Cost : Currently, a single-user license for NIST REFPROP 10
: If you already own a 9.x license, you can upgrade to Version 10 for a reduced fee of 2. The Legal "Free" Option: mini-REFPROP
For students or those who only need basic calculations, NIST provides mini-REFPROP 10.0 , a completely free sample version. What’s included : It features a limited selection of pure fluids, including
water, CO2, R134a, nitrogen, oxygen, methane, propane, helium, hydrogen, and dodecane , plus air.
: Teaching introductory thermodynamics and vapor-liquid equilibrium (VLE). Where to get it : You can download it directly from the NIST Thermodynamics Research Center 3. Key Features of REFPROP 10
If you are considering the full version, Version 10 (released in 2018) offers significant improvements over previous iterations: REFPROP | NIST
Refprop 10 Free Download 2021: A Comprehensive Guide
Refprop 10 is a popular thermodynamic property software used by engineers, researchers, and scientists to calculate the properties of refrigerants and other fluids. The software is widely used in the HVAC&R industry, as well as in research and development applications. In this article, we will provide a comprehensive guide on how to download Refprop 10 for free in 2021, its features, and its applications.
What is Refprop 10?
Refprop 10 is a software package developed by the National Institute of Standards and Technology (NIST) to provide a comprehensive database of thermodynamic properties of refrigerants and other fluids. The software allows users to calculate properties such as density, viscosity, thermal conductivity, and heat capacity of various fluids, including refrigerants, hydrocarbons, and other substances.
Features of Refprop 10
Refprop 10 offers a wide range of features that make it a valuable tool for engineers, researchers, and scientists. Some of its key features include:
Applications of Refprop 10
Refprop 10 has a wide range of applications in various fields, including:
How to Download Refprop 10 for Free in 2021
Refprop 10 is a free software package that can be downloaded from the NIST website. Here are the steps to download Refprop 10 for free in 2021:
System Requirements for Refprop 10
Refprop 10 can be installed on Windows and Mac operating systems. Here are the system requirements:
Alternatives to Refprop 10
While Refprop 10 is a widely used software package, there are alternative software packages available that offer similar features and functionality. Some of these alternatives include:
Conclusion
Refprop 10 is a valuable software package for engineers, researchers, and scientists who need to calculate the properties of refrigerants and other fluids. The software is widely used in the HVAC&R industry, as well as in research and development applications. In this article, we provided a comprehensive guide on how to download Refprop 10 for free in 2021, its features, and its applications. We also discussed alternative software packages that offer similar features and functionality.
FAQs
By following the steps outlined in this article, you can download Refprop 10 for free in 2021 and start using it to calculate the properties of refrigerants and other fluids.
I can’t help with finding or distributing pirated or unlicensed copies of software. If you’re looking for a legitimate way to obtain REFPROP 10 (released by NIST), here are lawful alternatives and a detailed guide to get, install, and use it properly:
If you want, I can:
Which follow-up would you like?
(Invoking related search suggestions.)
REFPROP 10 (Reference Fluid Thermodynamic and Transport Properties) is the gold standard for researchers and engineers needing high-accuracy thermophysical property data for fluids. Version 10, released by NIST, introduced significant improvements over previous versions, including new equations of state and expanded fluid mixtures. Because it is a highly specialized, proprietary software developed by the National Institute of Standards and Technology, it is not available as a free download.
If you are looking for REFPROP 10 for your engineering projects or academic research, here is everything you need to know about its availability and the legitimate free alternatives. The Reality of REFPROP 10 Downloads
While you may see websites claiming to offer a "REFPROP 10 free download 2021" or "REFPROP cracked version," these sources are almost always unsafe. NIST is a government agency, and REFPROP is a licensed product. Downloading it from unofficial sources puts your computer at risk of malware, and the data provided by cracked versions may be corrupted or outdated, which can ruin sensitive engineering calculations.
To get the official version, you must purchase a license through the Standard Reference Data program at NIST. This ensures you receive the full database of 147 pure fluids and the ability to calculate complex mixtures with the highest precision possible. Why Version 10 is the Industry Standard Released as a major update, Version 10 includes:
New equations of state for refrigerants and natural gas components.Enhanced calculation speed for large-scale simulations.Updated interfaces for Excel, MATLAB, Python, and C++.Improved consistency for mixtures, especially near the critical point. Free Alternatives to REFPROP 10
If your budget does not allow for a REFPROP license, there are powerful, open-source alternatives that provide similar functionality using the same underlying physics.
CoolProp (The Best Free Alternative)CoolProp is the most popular open-source competitor to REFPROP. It is free to use and includes a vast library of fluids. It even has a wrapper that allows it to pull data directly from REFPROP if you happen to have a license. It works seamlessly with Python, MATLAB, and Excel.
NIST WebbookFor quick, one-off calculations, you don't need to download anything. The NIST Chemistry WebBook is a free online resource that allows you to generate property tables and saturation curves for most common fluids using the same high-quality data found in REFPROP.
CanteraCantera is an open-source suite of tools for problems involving chemical kinetics, thermodynamics, and transport processes. It is highly favored in combustion research and complex fluid systems. How to Legally Access REFPROP
If your work requires the specific precision of REFPROP 10, the only way to obtain it is through the official NIST website or authorized distributors. Many universities provide free access to students and faculty through institutional licenses, so check with your department’s IT or library resources before purchasing an individual copy.
While there is no legal "free download" for REFPROP 10, the engineering community is well-supported by open-source projects like CoolProp. Using legitimate software ensures that your results are accurate, your system is secure, and you are supporting the continued development of vital scientific tools.
If you'd like to move forward with a specific tool, let me know:
What programming language are you using? (Python, Excel, MATLAB?) Are you working with pure fluids or mixtures? Is this for academic research or a commercial project?
The full version of NIST REFPROP 10 is not available as a free download. It is a professional database maintained by the National Institute of Standards and Technology (NIST) and requires a paid license for full access. However, NIST offers a free "Mini" version specifically for students and educational use. 🛠️ Legitimate Access Options Access Type Primary Use Case Mini-REFPROP Free Download
Educational tool for students; limited to 11 pure fluids (e.g., Water, CO2, R134a, Nitrogen). REFPROP 10 (Full) Paid ($325)
Professional use; includes 147 pure fluids and advanced mixture models. Upgrades Paid ($125)
Discounted price for users upgrading from version 9.x to 10.x. 📥 How to Get the Free Mini Version
The MINI-REFPROP Version 10 is the only official free version provided by NIST.
Fluid Selection: Includes Water, CO2, Nitrogen, Oxygen, Methane, Propane, Helium, Hydrogen, and Dodecane.
Capabilities: Allows for standard thermodynamic calculations and viewing saturation tables.
Excel Integration: You can link it to Excel using the REFPROP Excel Add-in, though support is limited for the free version. ⚠️ A Note on Security
You may encounter third-party sites claiming to offer "REFPROP 10 Full Version Free Download 2021." These are typically unauthorized and may contain malware. For safety and accuracy, always download directly from NIST or official distributors.
These tutorials demonstrate how to install the free version and link it with professional tools like Excel: Thermodynamic Calculations - Software REFPROP Mini Dr.-Ing. Manuel Ramsaier REFPROP Excel AddIn Randall Manteufel REFPROP Intro 2 Randall Manteufel 💡 Open-Source Alternative
If you require more fluids than the Mini version provides but cannot purchase the full license, consider CoolProp.
CoolProp: An open-source, free-of-charge alternative that uses similar high-accuracy Helmholtz energy formulations.
Integrations: It works seamlessly with Python, MATLAB, and Excel. If you'd like, I can help you: Find the installation steps for the Excel Add-in. Compare REFPROP vs. CoolProp for your specific project.
Check if your university offers a Site License for the full version. Which of these would be most helpful for your work? REFPROP | NIST
Even without a “free REFPROP 10 download 2021,” you have legal low-cost or zero-cost options:
(Note: This write-up does not provide or link to unauthorized downloads.)
Refprop 10 Free Download 2021: A Comprehensive Guide
Introduction
Refprop 10 is a popular thermodynamic property software used by engineers, researchers, and students to calculate the properties of refrigerants and other fluids. The software is widely used in the HVAC, refrigeration, and chemical industries. In this article, we will provide a helpful guide on how to download Refprop 10 for free in 2021.
What is Refprop 10?
Refprop 10 is a software package developed by the National Institute of Standards and Technology (NIST) to provide a comprehensive database of thermodynamic properties for refrigerants and other fluids. The software allows users to calculate properties such as density, viscosity, thermal conductivity, and heat capacity for a wide range of fluids.
Features of Refprop 10
How to Download Refprop 10 for Free in 2021
To download Refprop 10 for free in 2021, follow these steps:
Alternative Sources for Refprop 10 Free Download
If you are unable to download Refprop 10 from the NIST website, you can try the following alternative sources:
System Requirements for Refprop 10
Before downloading Refprop 10, ensure that your computer meets the following system requirements:
Conclusion
The official REFPROP 10 software is a proprietary database developed by NIST and is not available for free download
. As of early 2026, it remains a paid product, though a limited free "mini" version exists for educational purposes. National Institute of Standards and Technology (.gov) Official Acquisition and Pricing
To obtain the full version legally, you must purchase a license directly from the NIST Standard Reference Data shop Single User License: Upgrade (from v9.x to v10.x): Site Licenses:
Available for companies or institutions; existing site license customers may receive a 50% discount. National Institute of Standards and Technology (.gov) Free and Alternative Options
If you are looking for free access to fluid properties, consider these legitimate alternatives: mini-REFPROP:
A free sample version intended for students. It includes a limited selection of fluids like water, CO2, R134a, nitrogen, and methane. You can find it on the NIST Thermodynamics Research Center open-source
alternative that is free to use and provides similar fluid property data. It includes wrappers for Python, MATLAB, and Excel. Online Calculators: NIST provides a web-based version
of the database for free, where you can calculate specific state points without installing software. National Institute of Standards and Technology (.gov) REFPROP 10 Resources
If you already have a license, you can access the following guides and tools: Documentation: REFPROP 10 manuals
are available for free download to help with installation and use. Excel Integration:
Instructions for linking the REFPROP DLL to Excel can be found in the NIST REFPROP-wrappers GitHub repository Beta/Patches:
Current license holders can sometimes find beta DLLs or patches for specific issues on the TRC website or exploring the open-source alternative for your project? REFPROP | NIST
The full version of NIST REFPROP 10 is not available as a free download. It is a proprietary database developed by the National Institute of Standards and Technology (NIST) and requires a paid license for full access. National Institute of Standards and Technology (.gov) 1. Official Purchase & Cost As of 2021, the standard pricing for the full database is: New Purchase for a single-user download. if upgrading from a previous version (e.g., 9.x to 10.x). Official Link : You can purchase it directly through the NIST REFPROP product page 2. Free Alternatives & Trials
If you need the software for testing or educational purposes without paying the full fee, NIST provides a limited free version: mini-REFPROP
: This is a free, functional version of the program but is restricted to a small subset of fluids (e.g., water, cap C cap O sub 2 cap R 134 a
, nitrogen, oxygen, methane, propane, helium, hydrogen, and dodecane). It is primarily intended for teaching purposes and does not include technical support. : Available at the mini-REFPROP portal Open-Source Alternative : Many researchers use
, which is an open-source, free alternative that provides similar thermophysical property calculations. National Institute of Standards and Technology (.gov) 3. Installation & Updates
For users who already own a license, the following resources are available for setup:
REFPROP | NIST - National Institute of Standards and Technology Download REFPROP 10: $325.00 PLACE ORDER. National Institute of Standards and Technology (.gov) mini-REFPROP - Version 10.0
I notice you're looking for a "good paper" related to a search term for REFPROP 10 (a proprietary software from NIST for thermophysical properties of fluids) combined with "free download 2021".
To be clear:
If you're looking for a scientific paper that legitimately discusses REFPROP 10, here's a proper citation:
Lemmon, E. W., Bell, I. H., Huber, M. L., & McLinden, M. O. (2018). NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 10.0. National Institute of Standards and Technology.
You can find it on NIST's official site. For 2021-related updates, see:
Bell, I. H., et al. (2021). "REFPROP 10.0 – A major update to NIST’s reference fluid properties database." International Journal of Thermophysics, 42(3), 1–25.
If your goal is to get REFPROP functionality without cost, I strongly recommend CoolProp (open-source, high-accuracy, used in many research papers). Would you like guidance on using CoolProp or accessing legitimate free versions of REFPROP?
There is no official "free download" for REFPROP 10 released by the National Institute of Standards and Technology (NIST). As a high-accuracy proprietary software used for the thermodynamic and transport properties of fluids, it must be purchased through the NIST Standard Reference Data website or authorized distributors.
If you are looking for the official academic "paper" to cite for REFPROP 10, use the following reference:
Lemmon, E.W., Bell, I.H., Huber, M.L., McLinden, M.O. NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 10.0, National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg, 2018. Official and Open-Source Alternatives
If you cannot purchase REFPROP 10, consider these legitimate free alternatives: CoolProp
: An open-source, free library for fluid properties that is widely considered the best free alternative to REFPROP. It can be integrated into Python, Excel, MATLAB, and C++.
REFPROP-Wrapper (Python): While the wrapper is free on GitHub, it still requires a licensed installation of the REFPROP DLL/shared library to function. NIST Chemistry WebBook
: Provides free online access to the same high-accuracy data for individual fluids, though it does not allow for batch calculations or complex cycle modeling like the full software.
NIST REFPROP 10 is a professional software program for predicting the thermophysical properties of industrial fluids, developed by the National Institute of Standards and Technology (NIST) . It is not available as a free download for the full version. Official Purchasing & Pricing
REFPROP is distributed as a commercial product to fund its continued development. Official pricing as of early 2026 includes:
Full Single-User License: $325.00 for the single-user version on Shop NIST.
Version Upgrade: $125.00 for users upgrading from version 9.x to 10.x.
Site Licenses: Available for organizations, with discounts starting at 25 users. Existing site license customers receive a 50% discount on upgrades. Legitimately Free Options
If you are looking for a "free" version, NIST provides a restricted version for educational purposes:
mini-REFPROP: A free sample version intended as a teaching tool.
Limited Fluids: Includes only a few common fluids like water, CO2cap C cap O sub 2 R134acap R 134 a
, nitrogen, oxygen, methane, propane, helium, hydrogen, and dodecane.
Functionality: Allows basic calculations and is meant to introduce students to thermodynamics. Key Features of Version 10
Version 10, originally released in 2018 with ongoing updates, introduced several major enhancements over previous versions:
Expanded Database: Includes models for 147 pure fluids and 5 pseudo-pure fluids (like air). New Fluids: Added refrigerants like R1234yfcap R 1234 y f , plus various hydrocarbons and solvents.
Improved Accuracy: New reference equations of state for ammonia, helium, and heavy water.
Software Integration: Includes a DLL that allows linking with Excel , Python, MATLAB, and C++.
Optimization: Highly optimized Fortran code for faster calculation speed and better convergence. Important Licensing Note REFPROP | NIST
REFPROP 10 (Reference Fluid Properties) is a highly specialized engineering software developed by the National Institute of Standards and Technology (NIST). While users often search for a "free download," it is important to clarify that version 10 is not freeware. Product Overview
REFPROP 10 is the industry standard for calculating the thermodynamic and transport properties of industrial fluids and their mixtures. REFPROP | NIST
I understand you're looking for an article on the keyword "refprop 10 free download 2021." However, I must start with an important clarification: refprop 10 free download 2021
REFPROP (Reference Fluid Thermodynamic and Transport Properties) is proprietary software developed by the National Institute of Standards and Technology (NIST). It is not legally available as a free download, especially not for the 2021 version (REFPROP 10.0). NIST provides a free evaluation version with limited fluid packages, but full versions require a paid license.
Below is a comprehensive, SEO-friendly article that addresses user intent, explains legal options, cautions against piracy, and guides users toward legitimate access.