MAGNETOCALORIC REFRIGERATOR OR HEAT PUMP COMPRISING AN EXTERNALLY ACTIVATABLE THERMAL SWITCH

摘要

Magnetocaloric refrigerator or heat pump comprising an externally activatable thermal switch for transferring heat from a heat source to a heat sink, comprising: an insulator cage with thermally conductive windows for the source and sink; a magnetic nanofluid, comprised within said cage, wherein said magnetic nanofluid is able to flow under a magnetic field inside the insulator cage between a contact of the thermally conductive window of the heat source and a contact of the thermally conductive window of the heat sink; and a activatable magnet placed at either one of the thermally conductive windows, such that the produced magnetic field is aligned substantially parallel to the temperature gradient from heat source to heat sink. The apparatus alternates between: activating the magnet, such that the nanofluid flows to establish a thermal contact with the thermal source but not with the sink; deactivating the magnet, such that the nanofluid flows to establish a thermal contact with the thermal sink but not with the source.