This is a model of the heat transfer through an exterior wall, which is connected to an EnergyPlus Zone Heat Balance through Buildings.ThermalZones.EnergyPlus_9_6_0.ZoneSurface object on the interior surface and a Buildings.ThermalZones.EnergyPlus_9_6_0.OutputVariable to read the exterior surface temperature.
This model can be used in a Spawn simulation to substitute the heat conduction calculation performed by EnergyPlus with a Buildings.HeatTransfer.Conduction.MultiLayer object.