Patent AT-E399965-T1: [Translated] HEAT STORAGE AND USE OF THE HEAT STORAGE IN A HEATING SYSTEM WITH SOLAR SYSTEM AND HEAT PUMP

The invention relates to a heat accumulator having at least one first volume and one second volume. Said volumes are separate, can be respectively filled with, or passed through, by a medium, and are in, or can be brought into, thermal contact. The invention is characterised in that another volume that can be filled with a fluid and emptied, a so-called switchable volume, is provided between at least the first and second volumes, said switchable volume being in thermal contact with the media of the first and second volumes.