Ansys Icepak allows you to specify that any or all objects exchange radiative energy with other objects in the model or with a specified remote temperature if you are using the surface-to-surface radiation model. For radiation, the heat transfer rate is defined as
 | (28–1) |
where Tsurface is the temperature of the object surface, Tremote is the temperature of the surface to which the object radiates heat, σ is the Stefan-Boltzmann constant, F is a view factor specifying the fraction of radiant energy that is intercepted by the surface of the object, and e is the emissivity of the surface of the object (defined as part of the properties of the surface material specified for the object).
If you specify an object as radiating energy to and from a specified temperature, you must specify a remote temperature and an appropriate view factor.
If you specify an object as radiating energy to other objects in the model, Ansys Icepak automatically calculates the view factors and computes the radiative heat flux based on calculated object temperatures. If the sum of the view factors for a radiating object is less than 1, Ansys Icepak will define the remainder to radiate to the radiation temperature (Radiation temp) specified under Ambient conditions in the Basic parameters panel (see Ambient Values).