product information

SteamTab™ Product Information

Introduction

Designers of steam processing systems and equipment use a variety of conventional methods to look up steam properties for engineering calculation, including printed steam tables in different units, stand-alone steam property software, proprietary design software, general-purpose process simulators and long-hand calculations from fundamental equations. Lookup from printed steam tables remains the most frequently used method for daily use of steam properties. The interpolation of property values between fixed state points is a tedious, boring, and prone-to-error exercise that has plagued many generations of engineers.

SteamTab, designed as an add-in package to popular spreadsheet applications, allows users the convenient access, without leaving the spreadsheet computation environment, to a variety of steam property values. SteamTab contains a comprehensive set of water and steam properties  applicable over a wide range of conditions (temperature: 190-5,000 K; pressure: 0 to 100,000 bar), with selected derivative and dimensionless properties.

Using SteamTab in a spreadsheet allows you to examine a large number of design scenarios for optimization and visualize the results in great looking tables and charts.

SteamTab could also be used to generate Mollier charts and steam tables in your own choices of units, graduations, or language.

Formulation

SteamTab V3.0 uses a formulation approved by the International Association of the Properties of Water and Steam (IAPWS) in 1995 called: The IAPWS Formulation of Ordinary Water for General and Scientific Use (IAPWS-95). This formulation represents the most accurate current embodiment of scientific understanding of water and steam properties. Replacing the old NBS/NRC-84 formulation, IAPWS-95 becomes the current international standard for properties of water and steam.

Range

The IAPWS-95 formulation is valid in the entire stable fluid region of water. SteamTab imposes the following temperature and pressure restrictions:

• Pressure (P, bar): 0 <= P <= 100,000
• Temperature (T, K): 190 <= T <= 5,000

Package Contents

The SteamTab add-in package contains:

• Spreadsheet add-in files containing the SteamTab Functions and SteamTab user-interface consisting of dialog boxes and the SteamTab Toolbar.
• A dynamic link library (DLL) containing the core steam routines
• On-line, context sensitive help files
• A 40 page manual with a SteamTab Function Quick Reference card
• Free technical support

Unique Features

Some of the unique features of SteamTab are:

• Easy access to the most comprehensive set of thermodynamic and transport steam properties from the spreadsheet’s Tools menu or the SteamTab toolbar
• Direct "live" links to variable steam conditions by cell reference
• Built-in SteamTab™ worksheet functions, user-interface dialog-boxes and toolbars
• Choice of Metric/SI or English units
• Direct calculation of steam outlet conditions for isentropic, isenthalpic, constant internal energy or constant volume process
• SteamTab Functions for saturated vapor-liquid, superheated, subcooled, and constant steam properties
• Generate your own steam property diagrams using the spreadsheet’s charting capability
• Save steam property values for export to other applications – limited only by the spreadsheet’s file transfer capability
• Templates and examples for Expander, Compressor, Pressure reducing, Relative humidity, etc.

System Requirements

You should not encounter any hardware or software problems in using SteamTab on any hardware that has one of the following spreadsheet applications pre-installed:

• Microsoft Excel 95/97/2000/XP for Windows 95/98/NT4/2000/XP
• Lotus 1-2-3 V97/Millennium for Windows 95/98/NT4/2000/XP

SteamTab requires about 1,200 kilobytes (1 MB) of hard disk space. While SteamTab will work with 8 to 16 MB of RAM it is recommended that at least 32 MB of RAM be available.

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