XSteam was developed by Magnus Holmgren in 2006 and was published at www.x-eng.com. Unfortunately that site has been unavailable for several years now, making it very difficult to obtain the various versions of XSteam. Having used XSteam extensively in the past, I have created this repo to ensure that it remains available.

XSteam is a implementation of the IAPWS IF97 standard formulation. It provides accurate data for water and steam and mixtures of water and steam properties from 0 - 1000 bar and from 0 - 2000°C. It is available for MATLAB, Excel, OpenOffice, and as a DLL.

Provided thermodynamic properties are:

• Temperature
• Pressure
• Enthalpy
• Specific volume
• Density
• Specific entropy
• Specific internal energy
• Specific isobaric heat capacity
• Specific isochoric heat capacity
• Speed of sound
• Viscosity
• Vapour fraction

All properties can be calculated with the inputs, p and T known, p and h known, h and s known and some with pressure and density known.

XSteam is a full implementation of the IF-97 formulation including all regions and all backward functions for good calculation speed. The code is speed optimized with pressure and enthalpy as inputs for dynamic simulations.

Examples:

>> XSteam('h_pt', 1, 20) # returns the enthalpy of water at 1 bar and 20 °C
>> 84.0118 kJ/kg

>> XSteam('rho_ph', 1, 3000) # returns the density of steam at 1 bar and 3000 kJ/kg
>> 0.4056 kg/m3

>> XSteam('w_pt', 1, 20) # returns the speed of sound at 1 bar and 20  °C
>> 1483.4 m/s

>> XSteam('tSat_p', 1) returns the saturation temperature at 1 bar.
>> 99.6059  °C

The X Steam Tables are the perfect tool both for replacing paper tables and for advanced calculations. The XSteam tables are open source and free of charge.