Flow Adjusting: Oper. Conds Tab

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

○ Scalable Check this box to scale the flow of the main outlet stream.	Yes	Yes/No
◙ Mass Flow (of Main Outlet Stream) (kg/h or kg/batch) The mass flow rate of the main outlet stream.	0.0	Positive
◙ Volume Flow (of Main Outlet Stream) (L/h or L/batch) The volumetric flowrate of the main outlet stream.	0.0	Positive
○ Max Iterations If the volume flow of the main outlet stream is set, an iterative solution algorithm is employed in order to determine its mass flow. The maximum number of iterations corresponds to the maximum number of times that this algorithm can be repeated till it reaches convergence.	1000	Positive Integer
○ Relative Error If the volume flow of the main outlet stream is set, an iterative solution algorithm is employed in order to determine its mass flow. The relative error of the solution algorithm is defined in terms of the specified (V) and calculated (V) main outlet stream volume flows as \|1- V/V\|. The solution is considered to have reached convergence if the calculated relative error is less than or equal to the specified value.	0.00001	Positive
○ Match Process-In Stream Composition Check this box to let the program set the composition of the add-in stream to be the same as that of the process-in stream automatically, as soon as you run the M&E balances.	Yes	Yes/No
● Add-in (Adjustable) Stream Indicates the name of the input stream that is connected to the add-in (adjustable) stream’s input port. If an input stream is already present at that port, then the button next to the selection is active. Click on the button to bring up the attached stream’s simulation dialog in order to provide the composition of the material being charged.	<None>	Dedicated Input Port
○ Pressure Set by User? Check this box to set the operating pressure of the equipment.	No	Yes/No
◙ Pressure (atm) The operating pressure of the equipment.	1.0	Positive
● Operating Throughput per Unit (kg/h) The mass flow rate of the mixture of the two inlet streams divided by the number of equipment units that are operated in parallel.	0.0	Positive
○ 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.	0.0	Positive
◙ Process Time (min) The actual duration of the operation (per cycle).	60.0	Positive

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 Flow Adjusting: Modeling Calculations.

•Scalable Main Outlet Stream Flow...

If the “Scalable” option is checked and the user chooses to adjust the process throughput by a factor, then the flow of the main outlet stream will also be adjusted by the same factor.

•Main Outlet Stream Flow Specification Options...

Select one of the following options:

a) Set by Process (Downstream): In this case, the flow of the main outlet stream is specified by a downstream process.

b) Set by User: In this case, you can specify either the mass flow or the volume flow of the main outlet stream.

The model will adjust the flows of the adjustable add-in inlet stream and adjustable outlet stream in order to meet the main outlet stream flow specification.

•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

•Match Process-In Stream Composition...

If the “Match Process-In Stream Composition” option is checked, then the program will match the composition of the add-in stream with that of the process-in stream every time you run the M&E balances. If this option is un-checked, then the composition of the add-in stream must be set by the user.

•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 of the units), 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.