Batch Heating: Oper. Conds Tab

HeatOperConds.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.

50.0

Positive

○ Ignore Heating Utility
Check this box to ignore the heating utility type.

No

Yes/No

○ Power Type
Indicates the power type that is used by the operation if electricity is selected as the heat source. Click on the list box to bring up a list of available power types in order to select one.

<Std Power>

Any Power Type

● Power (kW)
The electrical power consumed for the operation.

0.0

Positive

○ Heating Agent Name
Indicates the heating agent that is used by the operation if a heating agent is selected as the heat source. Click on the list box to bring up a list of available heating agents in order to select one.

<Steam>

Any Heating Agent

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

152.0

Positive

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

152.0

Positive

● Rate (kg/h)
The mass flow rate of the heating agent.

0.0

Positive

● Duty (kcal/h)
The heat transfer rate of the heating agent.

0.0

Positive

○ Heat Transfer Efficiency (%)
The heat transfer efficiency of the operation.

90.0

[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

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

15.0

Positive

◙ Heating Rate (oC/min)
The heating rate of the vessel contents.

1.0

Positive

◙ Overall UA (kcal/h-oC)
The product of overall heat transfer coefficient and heat transfer area.

10502.32

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 Batch Heating: Modeling Calculations.

•If the Heating Utility is ignored...

No energy balances are done.

•Duration options...

You can set the process time (heating time), or have the process time calculated based on heating 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 heating rate: you can either specify a constant heating rate or an exponential heating 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.