Defining a heater

You define heaters by selecting regions in the drawing and specifying settings current in the Heaters dialog. One heater can have more than one region, but each region can belong only to one heater. If a heater consists of more than one region, each region only emits a fraction of the total heating power of that heater. By default CrysMAS splits the heating power equally between all regions of one heater, but you can also specify different fractions for one heater. However, the sum of all fractions must be 1. If not, the following message will be displayed:

Heater fractions message 

Figure 38. Heater fractions message

You have to adjust the fractions, before you are able to continue.

Note

If the region for the new heater does not yet exist, you need to draw it in Geometry Mode first.

  1. Open a *.crys file, e.g. VGF_prototype.crys.

    The geometry will be displayed by default.

    Basic screen of resistance heater (Simulation Mode) 

    Figure 39. Basic screen of resistance heater (Simulation Mode)

  2. Select Settings > Heaters.

    The Heaters dialog opens.

    Heaters dialog 

    Figure 40. Heaters dialog

  3. The right side of the furnace shall be completely visible and not covered by the Heaters dialog window, because you have to select at least one region for defining a heater.

    You can select more than one region for a heater by pressing and holding the Control key during selection with the left mouse button.

    Select the region(s) for the new heater with a click of the left mouse button.

    The region is highlighted in green.

    A heater noname is added to the heaters' list in the Heaters frame on the left.

    The number of the region accompanied by the property “Heater” is added in the Regions of heater frame on top of the right.

  4. The default heater name is “noname” and displayed in the field Name below the heaters' list. If you change it, do not use blanks in the new name.

    Overtype noname in the field Name and click on Apply or press the Enter key.

    The new heater name appears in the list, but the heater is not yet defined. As soon as you cancel the selection in the drawing or select an already defined heater, the new heater will vanish from the list.

  5. If the heater consists of more than one region, and you want to change the fraction proportions:

    Select the region, and type the new value in the input field Fraction.

  6. Click on the Resistance or the Induction check box; in case of induction, specify the frequency.

  7. You can choose between four heater settings:

    Heater setting

    Description

    Fixed power

    Heating power is set by the user and remains constant during computation.

    Power profile

    User defines time-dependent heating power values in table form ( *.pro file).

    Controlled power

    Power will be computed by CrysMAS in an inverse simulation; minimum and maximum have to be specified; the initial value will be replaced automatically after computation.

    Controlled profile

    Power will be computed by CrysMAS in a time-dependent computation; minimum and maximum have to be specified.

    Select the type of heater settings.

  8. Depending on the type of heater setting:

    Type the value in the input field for Fixed power.

    or

    Specify the *.pro file for Power profile.

    or

    Specify the initial, minimum and maximum values for Controlled power.

    or

    Specify the *.pro file and minimum/maximum values for Controlled profile.

  9. Click on Apply or press Enter to apply the changes, and click on Close to close the dialog.

    or

    Click on OK to apply the changes, and close the dialog.

Related Procedures

Defining heaters

Defining heaters in time-dependent computation

Related Dialogs

Heaters