Defining Surface to Ambient Radiation

To define surface to ambient radiation:

  1. Do one of the following:
    • In the Simulation study tree, right-click Thermal Loads and select Radiation .
    • Click Simulation > Loads/Fixture > Radiation.
    • Click Radiation (Simulation toolbar).
    The Radiation PropertyManager appears.
  2. Under Type, click Surface to ambient.
  3. In the graphics area, select the desired faces.
    To select all faces exposed to outside at once, click Select all exposed faces. To delete a face, right-click the face and select Delete.
  4. Under Radiation parameters, do the following:
    1. Select the desired unit and enter a value for the Ambient Temperature . To associate a time curve with the ambient temperature, click Use Time Curve time_curve.png Button then click Edit, and import or define a time curve. The value of the ambient temperature at any time instant is calculated by multiplying the specified ambient temperature value by the corresponding Y value of the time curve. This option is available for transient thermal studies only.
    2. Set the Emissivity . To associate a temperature curve with the emissivity, click Use Temperature Curve then click Edit, and import or define a temperature curve. The value of the emissivity at a given temperature is calculated by multiplying the specified emissivity value by the corresponding Y value of the temperature curve.
    3. Set the View Factor .
  5. Click .