# Products

## Steam Calculator

Excel add-in to calculate steam properties from a wide range of available input parameters: enthalpy, entropy, phase, pressure, quality, temperature subcool, temperature superheat.

## UM Converter

Is an engineering tool built as an MS Excel add-in or desktop application running in system tray, that makes conversions between hundreds of units in tens of categories.

# Frequently Asked Questions (FAQ)

Please browse the list with frequently asked questions to find out answers for your questions.

You may always contact us for any questions regarding our products.

#### Steam Calculator

**What is IAPWS-97?**

IAPWS is an international non-profit association of national organizations concerned with the properties of water and steam, particularly thermo-physical properties and other aspects of high-temperature steam, water and aqueous mixtures that are relevant to thermal power cycles and other industrial applications (IAPWS, 2008). In 1995 IAPWS released the IAPWS-IF95 standard used for the general and scientific use. The scientific formulation is a rigorous fundamental equation derived from a large set of experimental data. Two years later, IAPWS approved a new formulation of the thermodynamic properties of water and steam for industrial use. This standard is called "Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam" abbreviated to "IAPWS Industrial Formulation 1997" (IAPWS-IF97). The industrial formulation is a numerical approximation of the scientific formulation. The approximation is further facilitated by breaking up the fluid envelope into several distinct regions. Most of these regions provide properties as explicit functions of temperature and pressure allowing direct calculations of all derived properties. Thus, for most property values the industrial formulation is computationally faster than the scientific formulation.**Why to use a steam property calculator?**

Usually, thermo-physical properties of water and steam can be found in tabulated format. Sometimes, the process to obtain these data can be a complex one for the following main reasons: the requested information is not available or is difficult to be achieved, the process is tedious and time-consuming. In this context, chemical engineers need a powerful, accurate and easy-to-use software tool, not printed tables, in order to obtain the necessary information very fast. STEAM CALCULATOR contains a lot of functions intended to simplify the engineering calculations for some thermo-physical properties (temperature, pressure, enthalpy, entropy, quality) of water and steam.**I successfully installed Steam Calculator but in the user interface “Browse for input “ and “Browse for output” dialogs are not displayed. How can I have them working?**

Your MS Office user interface language and your Locale ( Regional settings ) do not match. You may either install the corresponding Multilingual User Interface Pack for your version of MS Office or change the locale (from Control Panel/Regional Settings) to have them match.**What is an Excel Add-in?**

An Excel add-in is a software component which adds functionalities to Microsoft Excel.**Which are the advantages of using an add-in application?**

Microsoft Excel Add-in uses full analytical power of Microsoft Excel (tabulated data format and user defined functions) to calculate some properties chemical engineers need. Once the thermo-physical properties are inserted directly into Excel, or imported from different process simulator software programs into Excel format, any functions exposed by the add-in file are available for use.**Which spreadsheet application does STEAM CALCULATOR support?**

The spreadsheet application which STEAM CALCULATOR support s is MS Excel versions: MS Excel 2000, MS Excel 2002, MS Excel 2003, MS Excel 2007, MS Excel 2010 (32-bit and 64-bit versions).**Is Steam Calculator add-in installed for all users or only for current user?**

Steam Calculator installation is a "per user" installation. If you need the add-in to be available under another user profile you have to login and run again the installation kit.**Do I need administrative priviledges to install Steam Calculator?**

You don't need administrative priviledges to install Steam Calculator add-in if .NET Framework 4.0 Client profile is already installed on the computer. However .NET Framework 4.0 installation requires local administrative priviledges.**Which are the equations used to calculate the output thermo-physical properties based on the input properties?**

The calculations are based on the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam, revised release August 2007, supplemented with additional backward equations and transport properties equations. Please find here the description, formulas and range of validity of the above mentioned equations.**Which are the range limits of the thermo-physical properties used in the STEAM CALCULATOR?**

The range limits of the properties used in STEAM CALCULATOR are presented below:

**Thermo-physical property****Symbol****Unit of Measure****Range**Temperature T C 0 - 2000 Pressure P KPa 0.611657 - 100000 Enthalpy H KJ/kg -0.041587373 - 4500 Entropy S KJ/(kg*C) -0.00015455 - 12 Quality X - 0-1 Density ρ kg/m3 - Internal Energy U kJ/kg -0.042199 - 4000 Isobaric Heat Capacity Cp kJ/kg/°C - Isochoric Heat Capacity Cv kJ/kg/°C - Specific volume v m3/kg 0.00095669 - 1000 Speed of sound w m/s - Thermal Conductivity λ W/m/°C - Viscosity μ μPa*s - Surface Tension σ N/m - Helmholtz Free Energy F kJ/kg - Gibbs Free Energy G kJ/kg - Compressibility Factor Z - - Isothermal Compressibility Kτ 1/kPa - Joule-Thompson Coefficient μJτ °C/kPa - Isothermal Joule-Thompson μ¯Jτ kJ/kg/kPa - Thermal Expansion Coefficient αv 1/°C - Prandtl Number Pr - - Static Dielectric constant ε - - **What does “Quality” represent?**

Quality is a measure of the quantity of steam which can be found in the condensate phase. It assumes values between 0 and 1; 0 contains only condensate (liquid phase), 1 contains only steam (vapor) phase.

#### UM Converter

**What is a unit of measure system?**

A unit of measure system is a set of units which can be used to specify anything which can be measured.**Which are the most commonly units of measure systems used around the world?**

Metric and English are the most common units of measure systems.**Which are the advantages of using UM Converter?**

UM Converter is designed as an add-in package to standard spreadsheet applications (e.g. Microsoft Office Excel). This reppresents the main advantage of this tool. Another important advantage is that the user-friendly, intuitive, interface will enable even first-time users to rapidly perform all their necessary conversions.**What is an Excel Add-in?**

An Excel add-in is a software component which adds functionalities to Microsoft Excel.**Which are the advantages of using an add-in application?**

Microsoft Excel Add-in uses full analytical power of Microsoft Excel (tabulated data format and user defined functions) to calculate/convert some properties chemical engineers need. Once the values are inserted directly into Excel, or imported from different process simulator software programs into Excel format, any functions exposed by the add-in file are available for use.**How can I access UM Converter from Microsoft Excel?**

The path you have to follow in order to access UM Converter is: Microsoft Excel/Tools/UM Converter/Converter.**Which are the categories of the UM Converter avialable in the full version?**

UM Converter contains 19 different categories such as: Amount of substance, Area, Density, Dynamic viscosity, Electric current, Enthalpic flow, Enthalpy, Entropic flow, Entropy, Length, Linear speed, Mass, Mass flow, Pressure, Temperature, Thermal conductivity, Time, Volume, Volume flow.**Which are the categories of the UM Converter available in the evaluation version?**

UM Converter Evaluation version is a free edition with a restricted set of features. There are only 3 tabs enabled in the Unit Converter dialog (user interface). The categories available in the Evaluation version are: Length , Mass and Temperature.**Which are the units of measure included in UM converter?**

A units of measure list included in UM Converter is presented here.**How can I find a desired unit of measure?**

On the user interface there is a bottom correspondent to the ”Find Unit of Measure” which allows to search a unit of measure within a scpecifci category or in all categories. The user has only to type the full name of the unit or a part of it in order to find the desired unit of measure.**How can the UMConvert Function be acessed?**

The path you have to follow in order to access UMConvert function is: Microsoft Excel/Insert /Functions /UMConvert.**Is there any difference between the small and capital letters used in the formulas?**

The units of measure abbreviations used in spreadsheet formula exposed by the UM Converter add-in are case sensitive (e.g. =UMConvert($A$1,"m","km") returns correct values menawhile =UMConvert($A$1,"M","km" returns an error #Value if the parameters values are invalid).

#### Ordering

**Are the updates free?**

The major updates are free for one year if you are a registered user. The minor updates are free for unlimited time.**What are the license conditions?**

The product is licensed per user. You can read the full license agreement here.**How can I buy?**

SWREG (http://www.swreg.org), the company that handles the payment accepts the next methods: credit cards (Visa, Master Card, American Express, JCB, Discover and Dinners Club), wire transfer, checks, cash money (accepted by mail transfer)

#### Latest version release list

- Steam Calculator: > download
- UM Converter: > download
- WinUM Converter: > download