Aspen Touch Solutions ATM-123R Series Especificações descarregar pdf (Página 45)

Automation 2-31

2-31

methods.

In most instances the collection object and member object of

the collection have nearly similar names. The name of the

collection object is normally the member name with an “s” at

the end. The Streams collection is an exception to this

statement, since it contains a collection of ProcessStream

objects. The flowsheet returns three stream collections;

MaterialStreams, EnergyStreams, and Streams. All three stream

collections accessed through the flowsheet are Streams objects.

The difference between the Streams collection objects relates to

how the member ProcessStream objects are filtered.

The example below, shows how to access a particular stream in

the system by index and how to retrieve the temperature value.

The remaining properties are accessed in a similar fashion.

The example below, shows how to access the MassFractionValue

for each component in the stream. An array of doubles is

returned to the variant hyCompFrac. The Ubound function is

used to determine the upper bound of the array and thus the

number of components. A separate object is set for the

component collection. The indexing between the array of mass

fractions and the list of components in the FluidPackage is

identical so it is easy enough to match the values with the

Syntax for accessing the ProcessStream object

By Name

SimulationCase.Flowsheet.MaterialStreams(“streamname”)

SimulationCase.Flowsheet.MaterialStreams.Item(“streamname”)

By Index

SimulationCase.Flowsheet.MaterialStreams.Item(j)

Example 1: ProcessStream

Dim hyFlowsheet As Object

Dim hyStream As Object

Set hyFlowsheet = hyCase.Flowsheet

Set hyStream = hyFlowsheet.MaterialStreams.Item(0)

MsgBox “Stream Temperature = “ & hyStream.TemperatureValue

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 373 374

Sem comentários

Aspen Touch Solutions ATM-123R Series Especificações Página 45