Heat exchange system, with - at least one heat exchange chamber with heat exchange chamber boundaries which surround at least one heat exchange chamber interior of the heat exchange chamber, wherein - the heat exchange chamber boundaries comprise at least one first opening for guiding in an inflow of at least one heat transfer fluid into the heat exchange chamber interior and at least one second opening for guiding out an outflow of the heat transfer fluid out of the heat exchange chamber interior; - at least one heat storage material is arranged in the heat exchange chamber interior such that a heat exchange flow of the heat transfer fluid through the heat exchange chamber interior causes a heat exchange between the heat storage material and the heat transfer fluid; and - the heat exchange system can be operated in an operating mode which is selected from the group consisting of charging mode with a heat transfer from the heat transfer fluid to the heat storage material and a discharging mode with a heat transfer from the heat storage material to the heat transfer fluid; and wherein - the heat exchange system is equipped with at least one active fluid motion device (1341, 1343) with which the heat exchange flow of the heat transfer fluid through the heat exchange chamber interior during the charging mode and during the discharging mode is caused, characterised in that the active fluid motion device (1341, 1343) is a joint active fluid motion device which is arranged such that the heat exchange flow for the charging mode and the heat exchange flow for the discharging mode are caused by the same active fluid motion device (1341, 1343). - at least one heat exchange chamber with heat exchange chamber boundaries which surround at least one heat exchange chamber interior of the heat exchange chamber, wherein - the heat exchange chamber boundaries comprise at least one first opening for guiding in an inflow of at least one heat transfer fluid into the heat exchange chamber interior and at least one second opening for guiding out an outflow of the heat transfer fluid out of the heat exchange chamber interior; - at least one heat storage material is arranged in the heat exchange chamber interior such that a heat exchange flow of the heat transfer fluid through the heat exchange chamber interior causes a heat exchange between the heat storage material and the heat transfer fluid; and - the heat exchange system can be operated in an operating mode which is selected from the group consisting of charging mode with a heat transfer from the heat transfer fluid to the heat storage material and a discharging mode with a heat transfer from the heat storage material to the heat transfer fluid; and wherein - the heat exchange system is equipped with at least one active fluid motion device (1341, 1343) with which the heat exchange flow of the heat transfer fluid through the heat exchange chamber interior during the charging mode and during the discharging mode is caused, characterised in that the active fluid motion device (1341, 1343) is a joint active fluid motion device which is arranged such that the heat exchange flow for the charging mode and the heat exchange flow for the discharging mode are caused by the same active fluid motion device (1341, 1343).