Abstract: A solar energy converter which can be used as a solar collector or for the direct mounting on a building for the heating of the interior thereof through a wall of the building has a light transmissive layer spaced from this wall and provided on its inner side with an absorptive surface at which incident solar energy is transformed into heat. One or more solar structures between this layer and the wall contain a chemico-physical phase transformation medium capable of storing latent heat when thermal energy is produced at the absorptive surface and adapted to release this heat through the wall or to a heat carrier fluid which can be passed through a space formed by the solar structure.

Abstract: The invention relates to a filiform addition for concrete or mortar consisting of a filament or a filament bundle. The filament or filament bundle carries at least one body having a diameter larger than the thickness of the filament or filament bundle. At the same time, the length of the filament or filament bundle is greater than the diameter of the body.