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 |
|
|
||
|
○ Scalable Output Flow |
Yes |
Yes/No |
|
◙ Output Mass Flow (kg/h or kg/batch) |
0.0 |
Positive |
|
◙ Output Volume Flow (L/h or L/batch) |
0.0 |
Positive |
|
○ Fixed Input Stream |
<None> |
Any Input Port |
|
○ Max Number of Iterations |
1000 |
Positive Integer |
|
○ Relative Error |
0.00001 |
Positive |
|
○ Output Stream Component Name |
<None> |
Any Pure Component |
|
◙ Output Stream Component Concentration (g/L) |
0.0 |
Positive |
|
◙ Output Stream Component Mass Fraction |
0.0 |
0-1 |
|
○ Setup Time (min) |
0.0 |
Positive |
|
◙ Process Time (min) |
60.0 |
Positive |
|
○ Ignore Labor? |
Yes |
Yes/No |
|
● Throughput per Unit (kg/h) |
0.0 |
Positive |
Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output
The following list describes the available specification choices in this tab; for more details on how these are implemented, see Mixture Preparation: Modeling Calculations.
•Output flow specifications...
Select one of the output flow specifications:
a) Output flow set by downstream process
b) Output flow set by user
c) Output flow calculated based on a fixed input stream
For n input streams(1<= n <=5), n-1 components, and concentrations need to be specified. The model will set the mass flowrate of the all inlet streams (top stream) in order to meet the concentration specification set by the user, and will initiate back-propagation; for more details, see Back-Propagation: Sources (Initiators) & Sinks (Terminals). If the mixing specification cannot be met, then a warning message will be displayed during simulation.
For the first flow specification, the output mass flow is set by the downstream process (through a back propagation request).
•Operating Throughput per Unit...
The operating throughput per unit is based on the mass flowrate of the output stream.
•Scalable Output Flow...
If the ‘output flow set by user’ flow specification is chosen, specify whether the absolute amounts for flowrate are scalable with process throughput adjustment. (This implies that if the user chooses to adjust the process throughput by a factor the user-specified flowrates will also be adjusted by the same factor.)
•Time Reference...
Choose the time reference for flowrate. The flowrate can be specified by the user to be per Batch, per Cycle, or per Time Average. Depending on whether the procedure is in batch mode or continuous, and the whether process is in batch mode or continuous, certain options may not be available. Specifically the availability of time reference flows depending on the mode of procedure / process is:
|
Process Mode |
Procedure Mode |
Time Reference for Flow |
|
|
|
|
|
Batch |
Batch |
Batch / Cycle |
|
Batch |
Continuous |
Batch / Time Average |
|
Continuous |
Continuous |
Time Average |
|
Continuous |
Batch |
Cycle / Time Average |
•Duration Options...
The duration controls appear only if the procedure is in batch mode. In Rating Mode, you can set the process time (and the setup time), allow the process time to be calculated (based on the throughput), or allow the duration to match exactly the duration of another operation either in the same procedure or in another procedure. In Design mode, you must either specify the process time (and the setup time) or allow the duration to match exactly the duration of another operation (either in the same procedure or in another procedure).
If you choose to match the duration of this operation with the duration of another operation, you introduce a master-slave relationship between the two operations. The program will match the setup-time, the process time and the turnaround time of this operation (the ‘slave’) with the corresponding times of the reference operation (the ‘master’ operation). For more on master-slave relationship, see The Scheduling Tab.