Alternative to NIST REFPROP

A cross-platform, open-source, alternative to NIST REFPROP. Based on reference-accuracy equations of state and transport property correlations for refrigerants like Water, CO2, R134a, Nitrogen, Argon, Ammonia, Air, R404a, R410a, Propane and many others. A selection of secondary working fluid properties are also available. Can also make use of REFPROP when available.

In addition, calculations for Humid Air Properties based on ASHRAE RP-1485 are provided.

Wrappers are available for MATLAB, Octave, Python, C#, Fortran and many more.

CoolProp is a C++ library that implements:

• Pure and pseudo-pure fluid equations of state and transport properties for 122 components
• Mixture properties using high-accuracy Helmholtz energy formulations
• Correlations of properties of incompressible fluids and brines
• Computationally efficient tabular interpolation
• Highest accuracy psychrometric routines
• User-friendly interface around the full capabilities of NIST REFPROP
• Fast IAPWS-IF97 (Industrial Formulation) for Water/Steam
• Cubic equations of state (SRK, PR)

CoolProp Architectures:

• 32-bit/64-bit
• Windows, Linux, OSX, Raspberry PI, VxWorks Compact Rio, etc. (if you can compile C++ on it, CoolProp will run)

Fluid Properties:

• Pure and Pseudo-Pure fluid properties
  • Introduction
  • Thermodynamic properties of Fluid
  • List of Fluids
  • Ideal Curves
    • Ideal Curve
    • Boyle Curve
    • Joule Inversion Curve
    • Joule-Thomson Curve
    • Ideal Curves for Refrigerant R125
• Mixtures
  • Theoretical description
  • Estimating binary interaction parameters
  • Using your own interaction parameters
  • Phase Envelope
  • Reducing Parameters
  • Excess Helmholtz Energy Terms
  • Appendix
  • Binary pairs
• Humid Air Properties
  • Molar Volume
  • Molar Enthalpy
  • Enhancement factor
  • Isothermal Compressibility
  • Sample HAPropsSI Code
  • Table of Inputs/Outputs to HAPropsSI
  • Psychrometric Chart
  • Humid Air Validation
  • Verification Script
• Incompressible Fluids
  • General Introduction
  • Pure Fluid Examples
  • Mixture Examples
  • Partial Derivatives
  • Fitting Reports
  • Thermodynamics of Incompressible Fluids
  • Equations
  • The Different Fluids
  • Adding New Fluids
• IF97 Steam/Water Properties
  • General Introduction
  • IF97 Backend
  • IF97 Range of Validity
  • IF97 Water Property Examples
• Advanced Fluid Properties
  • Use of Extended Corresponding States for Transport Properties
  • Conversion from ideal gas term to Helmholtz energy term
  • Converting Bender and mBWR EOS

CoolProp: This section includes information about the CoolProp software, listings of inputs, etc.

• Available Wrappers
  • Common Wrapper Prerequisites
    • Windows
    • Linux
    • OSX
• High-Level Interface
  • PropsSI function
  • Vapor, Liquid, and Saturation States
  • Imposing the Phase (Optional)
  • Fluid information
  • Trivial inputs
  • PhaseSI function
  • Partial Derivatives
    • First Partial Derivatives for Single-phase States
    • Second Partial Derivatives for Single-Phase States
    • First Saturation Derivatives
  • Predefined Mixtures
  • User-Defined Mixtures
  • Reference States
  • Calling REFPROP
  • Adding Fluids
  • C++ Sample Code
  • C++ Sample Code Output
  • Sample Code
  • Table of string inputs to PropsSI function
• Low Level Interface
  • Introduction
  • Generating Input Pairs
  • Keyed output versus accessor functions
  • Things only in the low-level interface
  • Imposing the Phase (Optional)
  • Partial Derivatives
  • Two-Phase and Saturation Derivatives
  • Reference States
  • Low-level interface using REFPROP
  • Access from High-Level Interface
• Tabular Interpolation
  • General Information
  • TTSE Interpolation
  • Bicubic Interpolation
  • Accuracy comparison
  • Speed comparison
  • More Information
• Configuration Variables
  • Configuration Keys
• REFPROP Interface
  • Path Issues
  • Other Platforms
  • Other Features