Extrusion: 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

○ Exit Temperature (^οC) The temperature of the material at the end of the operation.	230.0	Positive
○ Heat Transfer Agent Name Indicates the heat transfer agent used for the operation. Click on the list box to bring up a list of available heat transfer agents in order to select one.	Steam	Agent Name
● Inlet Temp. (C) The inlet temperature of the heat transfer agent.	152.0	Negative/Positive
● Outlet Temp. (C) The outlet temperature of the heat transfer agent.	152.0	Negative/Positive
● Heating (kcal/h) The heat transfer rate of the heating agent, if a heating agent is used	0.0	Positive
● Cooling (kcal/h) The heat transfer rate of the cooling agent, if a cooling agent is used.	0.0	Positive
● Agent Rate (kg/h) The mass flow rate of the heat transfer agent.	0.0	Positive
○ Heat Transfer Efficiency(%) The heat transfer agent efficiency. If the value is lower than 100% then an increased heat transfer agent amount will be calculated by the program to satisfy the required duty.	100.0	[0,100)
○ Power Type Indicates the power type that is used by the operation. Click on the list box to bring up a list of available power types in order to select one.	<Std Power>	Any Power Type
◙ Specific Power (kW/(kg/h)) The power consumed for the operation per feed mass flowrate.	0.1	Positive
◙ Total Power (kW) The total power consumed for the operation (per cycle).	0.0	Positive
◙ Power Per Unit (kW) The power consumed for the operation per equipment unit.	0.0	Positive
● Operating Mass Throughput (per Unit) (kg/h) The mass flow rate of the feed stream divided by the number of equipment units.	0.0	Positive
● Operating Volumetric Throughput (per Unit) (L/h) The volumetric flow rate of the feed stream divided by the number of equipment units.	0.0	Positive
○ Screw Angular Velocity (RPM)	200	Positive
○ Max Screw Angular Velocity (RPM)	300	Positive
○ Perform Reaction Calculations Check this box to perform reaction calculations after extrusion.	No	Yes/No
○ 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). It can be either set by user or set by a master-slave relationship.	60.0	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 Extrusion: Modeling Calculations.

•Screw Angular Velocity...

In User-Defined (Rating Mode), the Screw Angular Velocity is calculated by the program.

•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.