N-Way Component Splitting: Oper. Conds Tab

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Variable Definitions, Ranges and Default Values

The following table shows a brief description of the variables appearing in this tab. The table

also displays their default values and their generally acceptable range:

Variable

Default Value

Range

 

● Ignore Absent Streams
If set to “FALSE” the table of split specifications below has as many columns and the number of output ports of the procedure (regardless if there’s a stream attached); if TRUE, then only columns corresponding to output ports with streams are shown; a minimum of 2 columns must be shown so the top and bottom outlets are included unless some other port has a stream attached to it already.

FALSE

TRUE / FALSE

● Show Advanced Split Options
When set to FALSE, the user needs to specify the split % of each component to each outlet stream; if checked (TRUE), then the user can provide an alternate set of specifications to determine how the mass balances will be carried out. The specifications can be a combination of split % on a given outlet or mass % on a given outlet (or both or neither) for each component. When that option is checked the interfaces changes to show the number of specifications that are expected to be supplied as well indicate if some specifications conflict with each other (e.g. you can’t specify the mass % of two components on the same outlet if the number of components is 2).

FALSE

TRUE / FALSE

○ Split or Mass%
The percentage of the component that is directed to a specific stream or the mass percentage of a component on a specific stream.

0.0

0 - 100

● Total (%)
The sum of split percentages of a component to all output streams (shown only if all values refer to split %).

0.0

0 or 100

○ Setup Time (min)
The amount of time (per cycle) spent before each operation is carried in preparation for the actual execution of the operation. It may involve actions like cleaning, vacuuming, setting up of equipment, etc. which the user opted not to model explicitly. It is only shown if the procedure’s operating mode is batch.

0.0

Positive

◙ Process Time (min)
The actual duration of the operation (per cycle). It is only shown if the procedure’s operating mode is batch.

60.0

Positive

○ Process Time Calculation Options
Select how the process time is to be determined (shown only if the procedure’s operating mode is batch). It can be one of:
- Set-by-User: The process time is directly set by the user
- Calculated based on Throughput (only avail. if equipment is in Rating Mode)
- Calculated from Master-Follower

Set-by-User

One of: Set-by-User
Calc.
M/F

○ Ignore Labor?
Check this box to ignore labor for this operation. This option is used only if the process time is set by a master-follower relationship.

Yes

Yes/No

● Operating Throughput per Unit (kg/h)
The mass flow rate of the feed stream divided by the number of equipment units.

0.0

Positive

○ Pressure Set by User
Check this box to set the pressure.

No

Yes/No

◙ Pressure (atm)
The operating pressure of the vessel.

1.0

Positive

○ Consider Ambient Effect
Check this box to include the ambient effect to the energy balance.

No

Yes/No

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Specification Choices / Comments

The following list describes the available specification choices in this tab; for more details on how these are implemented, see Component Splitting Operations: General Description.

•Splitting Options...

For each component present in the feed stream specify its fraction in each output stream.

•Duration...

The duration controls appear only if the procedure in batch mode. In Rating Mode, you have a choice to either set the process time (and the setup time) or to allow the process time to be specified (based on the throughput). In Design mode, you must specify the process time (and the setup time) in order for the program to calculate the rated throughput.