Charge: Oper. Conds Tab

ChargeOperConds.jpg
Variable Definitions, Ranges and Default Values

The following table shows a brief description of the variables appearing in this tab; for a detailed description of these variables, see Charge: Modeling Terminology. The table also displays their default values and their generally acceptable range. Note that due to how the variables are used in the modeling equations, the range of acceptable values may be further reduced; for more details, see Charge: Modeling Assumptions & Constraints.

Variable

Default Value

Range

 

○ Charge Using Port / Stream
Indicates the input port that is connected to the charge stream. If an input stream is already present at the selected 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>

Any Input Port

◙ Mass (kg)
The amount (in mass) of material being charged.

0.0

Positive

◙ Volume (L)
The amount (in volume) of material being charged.

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.

15.0

Positive

◙ Process Time (min)
The actual duration of the operation.

0.0

Positive

◙ Mass Flowrate (kg/h)
The rate of transfer of material (on a mass basis). If the number of units is greater than one, then this rate represents the mass transfer rate per unit.

600.0

Positive

◙ Volumetric Flowrate (L/h)
The rate of transfer of material (on a volume basis). If the number of units is greater than one, then this rate represents the volumetric transfer rate per unit.

0.0

Positive

○ 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-slave relationship.

Yes

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 Charge: Modeling Calculations.

•Charge stream...

You must always select a charge stream. The charge stream must be one of the input streams of the procedure that this operation is participating AND it must be a process input (i.e. intermediate streams are not allowed as charge streams – to introduce material into a procedure from an intermediate stream, you must use a Transfer-In Operation). Furthermore, a procedure input stream can only be used by one charge operation (i.e. charge operations cannot share input streams). You can specify the mass / volume to be charged either from the operation or from the stream interface.

•Charge amount...

The charge amount can either be set directly on this dialog (so it becomes part of the operation’s set of specifications) or it can be set directly on the charge stream (attached to the charge port chosen on this dialog).

•Duration options...

The duration of the operation can be calculated by the following ways:

a)  Set directly the user

b)  Calculated based on a user-specified mass or volume charge rate, or

c)   Tied up to another operation or operation sequence by exploiting the Master-Slave relationship. If you introduce a master-slave relationship, 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 details on how to setup a master-slave relationship, see The Scheduling Tab.

See Also

●      Pull In

●      Transfer In