Electric Heating: Oper. Conds Tab

ElectricHeatingOperConds.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

 

○ Exit Temperature (oC)
The temperature of the outlet stream.

25.0

Positive

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

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

● Power Per Unit (kW)
The power consumed for the operation per equipment unit.

0.0

Positive

● Operating Power (kW)
The total power consumed for the operation (per cycle).

0.0

Positive

● Throughput per Unit (kg/h)
The operating mass throughput per equipment unit.

0.0

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).

240.0

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 Electric Heating: Modeling Calculations.

•Exit temperature...

The Exit Temperature is input in Design Mode and output in Rating Mode.

•Duration...

The duration options are available only when the procedure is 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 and rating power of the units). In the later case the throughput is an input. In Design mode, you must specify the process time (and the setup time) in order for the program to calculate the required power (per step and per unit).