Software Products

Our software products provide libraries of accurate engineering functions which are available through add-ins and calculators.  The add-ins attach directly to Microsoft Excel, Lotus 1-2-3 and MathCad.  They are used just like any of the built-in functions and require no macros or modules attached to the spreadsheets.  The latest versions also support the 64-bit version of Office 2010, 2013, 2016 and 365.

The calculators are powerful applications that run in their own windows and are independent of the spreadsheet applications.  They are convenient for calculating thermodynamic or transport properties at discrete conditions but can do much more.  You can store any number of data points for future reference, print them and even copy them to your favorite spreadsheet application.

WinSteam is our most popular product and has become the industry standard for thermodynamic and transport properties of steam and water.  It uses the latest industrial formulations (IAPWS IF97) developed by the International Association for the Properties of Water and Steam (IAPWS) and adopted by the American Society of Mechanical Engineers (ASME).  It also allows the use of the previous formulations (IFC 1967) to analyze products developed using those properties.  The WinSteam package includes DeskTop Steam, the advanced steam property calculator.

@Air provides thermodynamic and transport properties for moist air.  It is based on the formulations developed by the National Bureau of Standards (NBS) for the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE).  Techware Engineering has made some improvements to the formulations and extended the database to cover higher temperatures and pressures.  The @Air package includes DeskTop Air, the advanced air property calculator.

@Gas provides thermodynamic and transport properties for a mixture of gases including Nitrogen, Oxygen, Argon, Carbon Dioxide and Water Vapor.  These five gases account for 99.997% of the volumetric composition of standard air and better than 99.9% of the combustion products of most fossil fuels.  @Gas uses  formulations similar to those of @Air along with a database developed by Techware Engineering to provide accuracy in the range of pressure and temperature covered by this product.  The @Gas package includes DeskTop Gas, the advanced gas property calculator.

When you input the composition of standard air into @Gas, it produces results that are virtually identical to @Air.  @Gas, however, does not include functions dealing with relative humidity, degree of saturation or wet bulb temperatures.  Recognizing that there is an area of overlap between @Gas and @Air yet distinct advantages to having both products, we offer a substantial discount when you purchase both together.

XLInterp is a different type of product from the three described above.  It includes a library of functions used to extract numerical information from data tables.  These tables may represent properties for other fluids not covered by the products above, equipment performance curves or even financial data.  The functions use a process known as interpolation (either linear or non-linear) to extract information from the tables and can work in two dimensions.  The real power of XLInterp stems from its ability to interpolate both forwards and backwards.  See the product introduction for more information.  XLInterp only works with the Excel spreadsheet and has no calculator associated with it.

The DeskTop Set is a package that includes all four products discussed above including WinSteam, @Gas, @Air and XLInterp.  When you buy the DeskTop Set, you pay for WinSteam, the @Gas and @Air combo price and you get XLInterp for free.

DeskTop Steam is the steam property calculator that is included with WinSteam.  If you don't require the add-ins for use on your favorite spreadsheet program, you may find that DeskTop Steam is all you need.  It is far more convenient to use than the steam table book and costs less.

DeskTop Air is the air property calculator that is included with @Air.  If you don't require the add-ins for use on your favorite spreadsheet program, you may find that DeskTop Air is all you need.  It will not only accurately reproduce the air property values listed in the ASHRAE tables but extend the range to higher temperatures and pressures.

DeskTop Gas is the gas property calculator that is included with @Gas.  If you don't require the add-ins for use on your favorite spreadsheet program, you may find that DeskTop Gas is all you need.  It can also be used to calculate air properties when the mixture for moist air is used as input.