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Calculating the phase envelope for a mixture is an very important calculation since it provides basic information on how the mixture behaves in the temperature, pressure space.
VLXE can handle a very large range of systems. The code is not yet able to automatic handle all kinds of systems. Therefore 2 kinds phase envelope functions are provided.
One that takes a minimum of user input and two that gives the user maximum freedom.
This function takes a large range of input that gives the user maximum freedom.
Input
Argument
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Type
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Optional
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Description
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Feed
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Range of double
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No
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A range of cells with the feed
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CurveType
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C# : string
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No
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Type of phase boundary. Valid input are:
•LLE •VLE •Auto |
Direction
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C# : string
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No
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Direction in pressure. Valid input are:
•Up •Down |
Temperature
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C# : double
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No
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Temperature of the first point. Units [User defined]
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StopProperty
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C# : string
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No
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Where to stop the curve. Valid input are:
•Automatic - The curve stops when it cannot continue •Pressure - User gives the stop pressure. •Temperature - User gives the stop temperature •Enthalpy - User gives the stop enthalpy •Entropy - User gives the stop entropy |
StopValue
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C# : double
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No
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Value depends on StopProperty
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Output
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C# : string
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No
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Defines the output for each point on the curve. See here for more information.
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Components
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C# : string
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No
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Give a list of component names.
Only those components are used in the calculations.
See here for more information
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Units
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C# : string
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No
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Set the units used in this calculation.
See here for more information
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MinimumPressure
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C# : object
(Expect a range of double)
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Yes
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Polymer systems only:
Minimum pressure for the first point.
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MaximumPressure
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C# : object
(Expect a range of double)
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Yes
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Polymer systems only:
Maximum pressure for the first point.
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Distribution
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C# : object
(Expect a range of double)
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Yes
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Gives a range with the distribution of the polymer. Can for example be used if 2 flash calculations are liked as 2 separation tanks.
See here for more information
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BlockMassfraction
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C# : object
(Expect a range of double)
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Yes
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Sets the block mass fractions in a co-polymer.
See here for more information
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ProjectSheet
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C#: object
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Yes
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Lets the user set the project sheet to use.
See here for more information
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AdvVLXE
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C# : object
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Yes
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Advanced used. Reserved for use by VLXE.
See here for more information
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AdvUser
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C# : object
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Yes
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Advanced used. Reserved for the user. For example it can be used to force the function update.
See here for more information
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Extra
This function is defined in C# as:
public Object[,] PhaseEnvelopeBubbleP(Range Feed, string CurveType, string Direction, double Temperature, string StopProperty, double StopValue, string Output, string Components, string Units, [In, Optional] object MinimumPressure, [In, Optional] object MaximumPressure, [In, Optional] object Distribution, [In, Optional] object BlockMassfraction, [In, Optional] object AdvVLXE, [In, Optional] object AdvUser)
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