Defining Surface to Ambient Radiation

To define a 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.
    • In the Simulation toolbar, click Radiation .
    The Radiation PropertyManager appears.
  2. Under Type, click Surface to ambient.
  3. In the graphics area, select the faces. For models with beams or trusses, select Beams .
    To select all faces exposed to ambient radiation, click Select all exposed faces. To delete a face, right-click the face and select Delete.

    Ambient temperature is the environment temperature surrounding a model.

  4. Under Radiation parameters, do the following:
    1. Select the required unit and enter a value for the Ambient Temperature . To associate a time curve with the ambient temperature, click Use Time Curve , 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 .