**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.

- 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.

- 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*

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

- 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

- 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) .
- Check pricing for attractive quantity discounts.

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,
2013, 2016 and 365
(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.

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.

Go Back to Key Features

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.

You may download a simple program that allows you to change the Unitset argument to either Optional or Mandatory. It will work with WinSteam versions 3 and 4. Click Here to download the file "SetUnitsOptional.exe". Run this file to change the use of the Unitset argument with Excel.

When calling the functions from 1-2-3, the function name is preceded by the "@" character, eg. @StmPTH(P,T, Units).

If you wish to try **WinSteam**, you may download a fully
functioning copy for a 30 day evaluation period. You may also use
this download as a replacement for a lost or damaged copy of **WinSteam**. If you decide to purchase **WinSteam** you may use the
download and we will provide you with a serial number for permanent
use. Go to our Order page when you are ready to purchase **WinSteam**.