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 phase envelope functions are provided.
One that takes a minimum of user input and one that gives the user maximum freedom.
This function takes a minimum of input and over time this function will be able to automatic handle all kinds of mixtures.
Input
Argument |
Type |
Optional |
Description |
Feed |
Range of double |
No |
A range of cells with the feed |
Output |
C# : string |
No |
Defines the output for each point on the curve. See here for more information. |
Components |
C# : object (Expect a range of strings) |
No |
Give a list of component names. Only those components are used in the calculations. |
Units |
C# : object (Expect a string) |
No |
Set the units used in this calculation. |
Distribution |
C# : object (Expect a range of double) |
Yes |
Gives a range with the distribution of the polymer. Can for example be used if 2 flash calculations are liked as 2 separation tanks. |
BlockMassfraction |
C# : object (Expect a range of double) |
Yes |
Sets the block mass fractions in a co-polymer. |
ProjectSheet |
C#: object |
Yes |
Lets the user set the project sheet to use. |
AdvVLXE |
C# : object |
Yes |
Advanced used. Reserved for use by VLXE. |
AdvUser |
C# : object |
Yes |
Advanced used. Reserved for the user. For example it can be used to force the function update. |
Extra
This function is defined in C# as:
public Object[,] PhaseEnvelopeAuto(Range Feed, string Output, string Components, string Units, [In, Optional] object Distribution, [In, Optional] object BlockMassfraction, [In, Optional] object AdvVLXE, [In, Optional] object AdvUser)
Below is a screen dump showing the phase envelope of the test system with a poly disperse polymer. Note that the enthalpy for each phase is part of the output and that the LCEP is marked on the chart.
