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Steam Tables in Aspen HYSYS® V8.0 1. Objective Learn how to access Ste am Tables Tables in Aspe n HYSYS, and and how to interpret the Steam Table data.
2. Prerequisites
Aspen HYSYS V8.0 V 8.0
3. Background Aspen HYSYS off ers 2 types of Steam Tables Properties Methods: Methods: Property Method Name
Models odel s (Steam Tables)
Note The ASME Steam property method uses the: 1967 1967 International Associatio A ssociation n for Properties of Water and Steam (IAPWS, http://www.iapws.org)) correlations for http://www.iapws.org thermodynamic propertie prope rtiess
ASME Steam
ASME 1967 1967 STEAM-TA STEAM-TA method is made up of dif ferent correlations covering dif ferent ferent regions of the P -T space. These correlati correlations ons do not provide continuity at the boundaries, which w hich can lead to convergence problems and predict wrong trends. trends. The NBS Steam Ste am property methods uses the: 1984 1984 International Associat A ssociation ion for Properties of Water and Steam (IAPWS, http://www.iapws.org)) correlations for http://www.iapws.org thermodynamic propertie prope rtiess
NBS Steam Ste am
NBS 1984 1984
Use the NBS Steam property method for pure water and steam with temperature te mperature ranges of 273.15 273.15 K to 2000 2000 K. The maximum maximu m pressure press ure is over ove r 10000 10000 bar.
The examples presented are solely intended to illustra ill ustrate te specific concepts and principles. They may may not reflect an industrial application or real situation.
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4. Problem Using Aspen HYSYS, we want to calculate saturated steam properties from 100°C to 300°C. We would like to create a table that displays mass enthalpy, mass entropy, pressure, and density.
Aspen HYSYS Solution: 4.01.
Start Aspen HYSYS V8.0. Select New to start a new simulation.
4.02.
Create a component list. In the Component Lists folder, select Add. Add Water to the component list.
4.03.
Create a fluid package. In the Fluid Packages folder, select Add. Select NBS Steam as the property package.
4.04.
Go to the simulation environment.
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4.05.
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Add a material stream to the flowsheet from the Model Palette . Double cli ck on the stream to open the property window. Rename this stream STEAM and enter a Mole Fraction of 1 for water.
4.06.
In the navigation pane, go to Stream Analysis and click on the dropdown arrow next to Add and select Property Table . In the Select Process Stream window that appears, select STEAM and press OK.
4.07.
Next, double click on Property Table-1 to open the property window. Under Independent Variables select Temperature as Variable 1. Enter a Lower Bound of 100°C and an Upper Bound of 300°C. Enter 100 for # of Increments . Select Vapour Fraction for Variable 2 and select State for Mode . Enter a value
of 1 for State Values. We are going to be varying the temperature while holding the vapour fraction constant at 1.
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4.08.
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We must now defi ne the dependent properties that we are interested in viewing results for. Go to the Dep. Prop form under the Design tab. Select Add. Here we will add Mass Enthalpy, Mass Entropy, Pressure, and Mass Density.
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4.09.
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Click Calculate to generate the property table. Results can be viewed in the Performance tab of the property table window.
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5. Conclusion After completing this exercise you should now be f amiliar with how to access and interpret thermodynamic properties for steam using Aspen HYSYS.
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