DWSIM is a free, CAPE-OPEN compliant chemical process simulator available for Windows, Linux, and macOS. It features built-in advanced thermodynamic property packages (such as Peng-Robinson, NRTL, and PC-SAFT), providing full engineering simulation workflows completely free of charge.
Uses the same standard equations of state as REFPROP.
NIST spends years experimentally verifying fluid data.
Searching for "REFPROP 9.1 free download" may point to third-party "software informer" sites or trial versions. Use caution with these sources: Security Risk refprop 91 free
RefProp (REFPROP) is a property-reference program from NIST for calculating thermophysical and transport properties of pure fluids and mixtures (gases and liquids) using advanced equations of state and mixture models. REFPROP 9.1 refers to a specific past release of that software.
Many universities and large engineering firms hold site licenses. If you are a student or employee, check your organization's software portal. You may already have access to a legal download. 2. NIST Standard Reference Database
: You can safely install it via the NIST TRC mini-REFPROP portal . REFPROP - NIST DWSIM is a free, CAPE-OPEN compliant chemical process
The "free" versions found on the internet often fall into two categories:
While the full standard version of REFPROP Version 9.1 requires a commercial license, students, engineers, and researchers can utilize legitimate to perform high-accuracy fluid thermodynamic calculations legally. 1. What is REFPROP 9.1?
CoolProp is the most prominent open-source alternative to REFPROP. It is completely free for both academic and commercial applications. NIST spends years experimentally verifying fluid data
Because of its high value in chemical engineering, aerospace, and HVAC system design, cracked versions or illegal mirrors frequently circulate online. However, downloading cracked software poses severe risks:
Implements the most accurate models available for pure fluids and mixtures, largely based on reference-accuracy equations of state.
In the world of chemical engineering, HVAC design, and cryogenics, few tools are as revered as (Reference Fluid Thermodynamic and Transport Properties Database). Developed by the National Institute of Standards and Technology (NIST), REFPROP is the industry standard for calculating the properties of pure fluids and mixtures.
It can be found by searching for "mini refprop" on the NIST website or through university resources. 2. Pricing and Licensing for Full Versions
In the world of thermodynamics, (REference Fluid PROPerties) is the gold standard for calculating the behavior of industrial fluids and refrigerants. Because it is such a critical tool, many users go looking for a free version of REFPROP 9.1 , but the reality is that the full software has always been a paid product distributed by the National Institute of Standards and Technology (NIST) .