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WinSteam 4.0




WinSteam 4.0

WinSteam provides accurate thermodynamic and transport properties of steam and water for Windows applications using the new IAPWS-IF97 formulations as revised in 2007.   WinSteam also allows you to select the IFC 1967 formulations for compatibility with older projects.

The steam property functions can be used directly from within applications including Microsoft Excel, 1-2-3 and MathCad.  Add-ins attach the functions so that you can use them as if they were built in to the applications.

This version supports 32-bit and 64-bit applications.  New 64-bit components include the steam function library (DLL), the Excel Add-in and DeskTop Steam.  The package also includes 32-bit versions of these components plus the add-ins for 1-2-3 and MathCad.

Programmers can call the WinSteam functions from Visual Basic or Visual C++.   WinSteam also includes the stand-alone product DeskTop Steam, an advanced steam property calculator.  If you do not need to access the steam functions from a spreadsheet, you may purchase DeskTop Steam alone.

What’s New in Version 4.0

  •  Uses new IAPWS-97 formulations revised in 2007
    • Region 5 formulations were modified to increase the pressure range from 10 MPa (1450.3 psia) to 50Mpa (7251.9 psia) for high temperature steam in the range from 800 deg C (1472 deg F) to 2000 deg C (3632 deg F).
    • Some improvements to the transport properties were also incorporated as published by IAPWS in December, 2008.
  • Added 64-bit version of Excel Add-in compatible with Office 2010, 64-bit.
  • Added 64-bit version of Steam property DLL.
  • Added 64-bit version of DeskTop Steam.
  • Converted all help files to compiled HTML format.
  • Removed WinSteam Help link from all versions of Excel and 1-2-3 menus.
  • Includes new functions
    • StmPVT – calculates temperature from pressure and specific volume.
    • StmPVQ – calculates quality from pressure and specific volume.
    • StmTVP – calculates pressure from temperature and specific volume.
    • StmTVQ – calculates quality from temperature and specific volume.

What was New in Version 3.2

  • Removed Help file link from Help Menu for Excel 2007 and later.
  •  Fixed some calculation convergence problems in critical region.
  •  Minor improvements in DeskTop Steam display.

WinSteam 3.2 is available as a free upgrade to licensed users of WinSteam 3.0 and 3.1

What was New in Version 3.1

  • Added additional unit sets including metric units
  • DeskTop Steam now allows users to select IFC 1967 formulations instead of IF97
  • DeskTop Steam now uses a drop down list box instead of the spin control to select stored points.

WinSteam 3.1 is available as a free upgrade to licensed users of WinSteam 3.0.

What was New in Version 3.0

  • Uses new IAPWS IF97 formulations.
    • Current International Standard
    • Increases Temperature limit from 800 deg C to 2000 deg C
    • Greater accuracy
    • Faster calculation times
  • Includes new functions
    • StmPTG – calculate isentropic expansion coefficient
    • StmPTW – calculates sonic velocity
    • StmPQG – calculate isentropic expansion coefficient
    • StmPQW – calculates sonic velocity
    • StmTQG – calculate isentropic expansion coefficient
    • StmTQW – calculates sonic velocity
    • StmPHC – calculates specific heat
    • StmPHG – calculate isentropic expansion coefficient
    • StmPHW – calculates sonic velocity
    • StmPSC – calculates specific heat
    • StmPSG – calculate isentropic expansion coefficient
    • StmPSW – calculates sonic velocity
  • Includes DeskTop Steam, advanced steam property calculator
  • Supports only 32-bit applications

Key Features

  • Uses new IAPWS IF97 formulations by default.
  • User can choose to use IAPWS-IFC67 formulations if desired.
  • Includes DeskTop Steam, a new advanced  interactive steam property calculator.
  • Functions can be used as if they were built in to most popular spreadsheet programs.
  • 47 functions support most useful combinations of input data.
  • New functions return sonic velocity and isentropic expansion coefficient.
  • Accepts English, SI or metric units.
  • Functions can be called from many Windows programming languages.
  • Allows pressures up to 16,000 psia.
  • Allows temperatures from 32.018 deg F to 1472 deg F (800 deg C)  for full range of pressures.
  • Allows temperature up to 3632 deg F (2000 deg C)  for pressures up to 7251.9 psia (50MPa) .

Applications Supported

The WinSteam package includes various add-ins which link the functions to many popular 32-bit and 64-bit Windows applications.  32 bit add-ins are included for Microsoft Excel Versions for Office 95, Office 97, Office 2000; Office XP, Office 2007 and Office 2010 (32-bit version); Lotus 1-2-3 97 and 1-2-3 Millennium and MathSoft Mathcad Plus Versions 6, 7 and 8. A 64-bit add-in is included for Office 2010 (64-bit version.)

No programming is required to use the WinSteam functions with any of these applications. Just follow a few simple steps to load the add-in, and from then on, the functions will be available every time you start the application. You use the functions just like any of the built-in functions. The functions can be used in any spreadsheet formula and any argument to the functions can be a number, a formula or a cell reference.

Programming Languages Supported

All of the steam property functions are contained in a Windows Dynamic Link Library (DLL). The WinSteam package includes  32-bit and 64-bit versions of the DLL, which supports applications designed for Windows 95, 98, NT, 2000, XP, Vista and Windows 7.  Function prototypes and LIB files are included in the package to support Microsoft C/C++ compilers. Declaration files are included to facilitate programming with Microsoft Visual Basic or Microsoft Access.


The following table lists all of the WinSteam functions currently available.

Function(Input Arguments) Output Value
StmPT(Pressure, Unitset) Saturation Temperature
StmTP(Temperature, Unitset) Saturation Pressure
StmPQV(Pressure, Quality, Unitset) Specific Volume
StmPQH(Pressure, Quality, Unitset) Specific Enthalpy
StmPQS(Pressure, Quality, Unitset) Specific Entropy
StmPQC(Pressure, Quality, Unitset) Specific Heat
StmPQW(Pressure, Quality, Unitset) Sonic Velocity
StmPQG(Pressure, Quality, Unitset) Isentropic Expansion Coefficient
StmPQM(Pressure, Quality, Unitset) Viscosity
StmPQK(Pressure, Quality, Unitset) Thermal Conductivity
StmTQV(Temp, Quality, Unitset) Specific Volume
StmTQH(Temp, Quality, Unitset) Specific Enthalpy
StmTQS(Temp, Quality), Unitset) Specific Entropy
StmTQC(Temp, Quality, Unitset) Specific Heat
StmTQW(Temp, Quality, Unitset) Sonic Velocity
StmTQG(Temp, Quality, Unitset) Isentropic Expansion Coefficient
StmTQM(Temp, Quality, Unitset) Viscosity
StmTQK(Temp, Quality, Unitset) Thermal Conductivity
StmPTV(Pressure, Temp, Unitset) Specific Volume
StmPVT(Pressure, Volume, Unitset) Temperature
StmPVQ(Pressure, Volume, Unitset) Quality
StmTVP(Temperature, Volume, Unitset) Pressure
StmTVQ(Temperature, Volume, Unitset) Quality
StmPTH(Pressure, Temp, Unitset) Specific Enthalpy
StmPTS(Pressure, Temp, Unitset) Specific Entropy
StmPTC(Pressure, Temp, Unitset) Specific Heat
StmPTW(Pressure, Temp, Unitset) Sonic Velocity
StmPTG(Pressure, Temp, Unitset) Isentropic Expansion Coefficient
StmPTM(Pressure, Temp, Unitset) Viscosity
StmPTK(Pressure, Temp, Unitset) Thermal Conductivity
StmPHT(Pressure, Enthalpy, Unitset) Temperature
StmPHV(Pressure, Enthalpy, Unitset) Specific Volume
StmPHS(Pressure, Enthalpy, Unitset) Specific Entropy
StmPHQ(Pressure, Enthalpy, Unitset) Quality
StmPHC(Pressure, Enthalpy, Unitset) Specific Heat
StmPHW(Pressure, Enthalpy, Unitset) Sonic Velocity
StmPHG(Pressure, Enthalpy, Unitset) Isentropic Expansion Coefficient
StmPST(Pressure, Entropy, Unitset) Temperature
StmPSV(Pressure, Entropy, Unitset) Specific Volume
StmPSH(Pressure, Entropy, Unitset) Specific Enthalpy
StmPSQ(Pressure, Entropy, Unitset) Quality
StmPSC(Pressure, Entropy, Unitset) Specific Heat
StmPSW(Pressure, Entropy, Unitset) Sonic Velocity
StmPSG(Pressure, Entropy, Unitset) Isentropic Expansion Coefficient
StmTempTI(ITS-95 Temp. Unitset) IPTS-68 Temperature
StmTempIT(IPTS-68 Temp, Unitset) ITS-95 Temperature
StmVer() Version and Serial Number

The Unitset argument is used to select the unit set, formulations and other calculation options.  During installation you are asked whether you want the unit set argument to be mandatory or optional when using the functions with Excel.  We recommend that you make it mandatory and always use the Unitset argument.  If you have older Excel files in which the WinSteam functions were used without the Unitset argument they will return an error if you have selected to make the Unitset argument mandatory.  In this case you should make the Unitset argument optional. 


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