Vibrating Screening: 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

○ Split (%)	0.0	0 – 100
○ Amount (kg) The specified amount of a component that is split to the selected outlet port. If the component amount exceeds the available amount in the feed then all of the amount will be directed to the selected port.	0.0	Positive
○ Scaleable Check this box to scale up or down the operation data. In this case the specified split component amounts.	Yes	Yes/No
● Operating Throughput per Unit (kg/h)	0.0	Positive
○ Mesh Size (mm)	5.0	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
○ 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
○ 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.	0.0	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
○ Power Dissipation to Heat (%) The percentage of total power consumed for this operation that turns into heat, thereby raising the temperature of the material contained in the equipment.	0.0	[0,100]

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 Vibrating Screening: General Description.

•Splitting Options...

For each component present in the feed stream check the Set Split (%) or the Set Amt. options and specify its fraction or mass amount 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.

You can set the process time (cooling time), or have the process time calculated based on cooling rate, or match the duration of this operation to the duration of another operation by introducing a master-slave relationship between the two operations. There are two options for specifying the cooling rate: you can either specify a constant cooling rate or an exponential cooling rate (specify the overall UA). 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