Dead End Filtration: 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

○ % Removed The percentage of a particulate component that is removed.	0.0	0-100
○ Particle Conc. in Retentate (vol/vol) The particle concentration in retentate.	0.5	Positive
○ Setup Time 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
○ Turnaround Time The amount of time (per cycle), that the operation’s equipment is being prepared for the next cycle (cleaning, transferring of material, sterilization, etc. that is not explicitly modeled but simply lumped up inside the main operation).	0.0	Positive
◙ Filtrate Flux (L/m²-h) The volumetric flow rate of the filtrate per filter area.	250.0	Positive
◙ Filtrate Volume Per Area (L/m²) The volume of the filtrate per filter area.	100.0	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 Dead End Filtration: Modeling Calculations.

•Filtration Time Options...

a) You can set the process time (Filtration Time)

b) You can have the process time calculated based on the average filtrate flux. (This option is available only in rating mode)

c) You can match the duration of this operation to the duration of another operation by introducing a master-slave relationship between the two operations. The program will match the setup-time, the process time and the turnaround time of this pumping operation (the ‘slave’) with the corresponding times of the reference operation (the ‘master’ operation). For more on master-slave relationship, see The Scheduling Tab.

•Removal of Particulate Components...

When the ‘Calculated’ option is selected, it is assumed that 100% of all components that have a particle size greater than the filter pore size is retained by the filter.

•Filtrate Data...

When the Process Operating Mode is Batch you can set either the Filtrate Flux or the Filtrate Volume Per Area. In all other cases, the Filtrate Volume Per Area is calculated by the program.