Batch Crystallization: Oper. Conds Tab

BatchCrystallizationOperCondsPP.jpg
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

 

◙ Final Temperature (oC)
The final temperature of vessel contents after the end of the operation.

25.0

Positive

◙ Cooling Duty (kcal/h)
The cooling duty of the heat transfer agent.

0.0

Positive

○ Agent
Indicates the heat transfer agent used by the operation. Click on the list box to bring up a list of available heat transfer agents in order to select one.

<Chilled Water>

Cooling

Agents

● Inlet Temp. (oC)
The inlet temperature of the heat transfer agent.

5.0

Positive

● Outlet Temp. (oC)
The outlet temperature of the heat transfer agent.

10.0

Positive

● 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)

○ 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.

5.0

Positive

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

120.0

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 (Per Volume) (kW/m3)
The power consumed for agitation per volume of material.

0.1

Positive

◙ Total Power (kW)
The total power consumed for agitation (per cycle).

0.0

Positive

◙ Power Per Unit (kW)
The power consumed for agitation 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.

100.0

[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 Batch Crystallization: Modeling Calculations.

•Pressure...

The pressure of the system, if not specified by the user, is set equal to the pressure of the previous operation.

•Duration options...

You can set the process time (crystallization time) or match the duration of this operation to the duration of another operation by introducing a master-slave relationship between the two operations. 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.