English: Thermal bridge. Configuration has two walls made of concrete, with a concrete bridge. Air is the insulator. The "inside" of the building (purple) is heated to 303K (around +30 C) and the "ouside" (light blue) is at 297K (around 0 C). The thermal bridge (also made of concrete) causes the heat to be transferred more effectively - the outer wall is warmer, and the inner wall is cooler, respectively. Modelled with FEMM 4.2.