It adds equations for the heat rates Pp1 and Pp2 and the temperatures Tp1 and Tp2 at the connecting ports p1 and p2 of the component, and defines the following relation between the heat rate P and the temperature difference ΔT:

where R (SI unit: K/W) is the radiative thermal resistance, which is defined to take into account radiative heat transfer between two opaque diffuse gray surfaces in an enclosure.

See Theory for the Radiative Thermal Resistor Component for more details on the underlying theory.

Enter a Component name for the radiative thermal resistor. The prefix is RR.

Set the two Node names for the nodes connected by the radiative thermal resistor.

Select a Radiation type for the surfaces. By default, Blackbody radiation is assumed, which sets ε1 = ε2 = 1 in the expression of the radiative thermal resistance R. When the Radiation type is Graybody radiation, select any material from the Material lists to define the Surface emissivity ε1and Surface emissivity ε2 From material. For User defined enter values or expressions.

Select a Surface configuration from the following options:

Set user defined values or expressions for the Initial temperature at node 1, T1,init, and the Initial temperature at node 2, T2,init, to be used at initialization, in particular to evaluate the surface emissivities.

Select appropriate options in the Add the following to default results in order to include the following global variables (space-independent) in the default plots:

Physics tab with Lumped Thermal System selected: