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Role Of Software For Steam And Water Properties
Water is the cheapest and most widely used engineering fluid for transportation and conversion of heat energy. Water is chemically very stable with excellent thermal properties and is therefore used as the primary heat carrier in steam power plants and in heating duties. The importance of water and steam in thermal power engineering and science is undeniable.
At standard atmospheric pressure, water changes its phase and turns into vapor at about 100ºC when heat is added and turns into solid ice at about 0ºC when heat is rejected. The vapor temperature, called the saturation temperature, increases as the pressure increases. Another phenomenon is that when liquid water vaporizes, it passes through a mixed phase, called the saturation zone, when both water and vapor coexist until it completely turns into dry vapor and during that period the temperature does not increase when the pressure is maintained. stable Beyond the saturation region, temperature increases at constant pressure.
The saturation phase phenomenon exists up to a certain point called the critical point, and water above the critical pressure and critical temperature range is directly converted to steam without passing through the saturation zone. Thus, leaving aside the water ice phase, the vapor and water phases themselves present a wide range of changing conditions and give rise to complications in the determination of the various properties of the various phases.
In heat power engineering, the most commonly used intensive properties of steam and water are pressure and temperature and extensive properties such as enthalpy, entropy, dryness fraction, specific volume, viscosity, isobaric and isochoric heat capacity and thermal conductivity. There are also other properties that are used as needed but they are not used very regularly. Intensive properties such as pressure and temperature can be measured directly by instruments but most other detailed properties need to be calculated. Manual calculations of bulk properties require practically complex and lengthy mathematical procedures and are generally not feasible to follow in day-to-day engineering work.
Steam tables and Mollier diagrams (graphs showing the thermodynamic properties of steam and water) based on intensive and other comprehensive properties have served industry for over 100 years. Although STEAM tables and diagrams still provide reasonably acceptable data, it is always difficult to obtain accurate output from tables and charts due to interpolation errors. The introduction of personal computers has made it possible to overcome these difficulties to a great extent. The International Association for the Properties of Water and Steam (IAPWS), the body responsible for providing guidelines for the calculation process, has done a formidable job in standardizing methods with electronic computers in mind. In fact today, using software programs to calculate steam and water properties based on IAPWS procedures has become an engineering standard.
It is easy to buy or download the free version of Steam and Water Properties software over the Internet. However, one should be careful while choosing the right one. A review of some of them shows that not all are equally good. The first thing is to check that the program can output all relevant properties if any two properties such as pressure, temperature, enthalpy, entropy and dryness fraction (and sometimes also specific volume) are given as input parameters. . Most programs do not cover this full range of input and output options.
Another item is to check that the program accepts the use of SI, English and traditional US units. Accuracy is the key aspect, which must be verified by the purchaser using the figures specifically given for testing at IAPWS. Some programs come with basic numeric input/output along with graphic features, but their use may be more relevant to classroom studies and research work. Continuous modification of the program is another aspect that requires the buyer’s attention and when the IAWPS issues a change notice and unfortunately many sellers do not take immediate care in this regard. Price is the last issue that a buyer should spend time on. It’s worth scouting because software prices for similar features can vary greatly. Buyers should do their due diligence and compare prices before making any decisions.
It can be summarized that heat power engineers using steam properties are strongly encouraged to use the software and this program is based on IAWPS latest version, providing input/output data and features of units, accuracy, updating options and finally maximum selection. price
To read more about steam and water properties you can visit http://www.steam-water-properties.com
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