Schematic illustration of one magnetocaloric cooling cycle (IMAGE)
Caption
Upper left: the magnetocaloric material starts in the magnetically disordered (paramagnetic) state at temperature T. Upper right: an external magnetic field is applied and causes the material to enter the magnetically ordered (ferromagnetic) state, with a consequent rise in temperature to T+ΔT. Lower right: heat is transferred away from the material to reduce its temperature back to T. Lower left: the magnetic field is removed and causes the material to lose its magnetic order, returning to the paramagnetic state and decreasing the temperature to T-ΔT. Heat can now be removed from the substance to be cooled (hydrogen), raising the temperature of the magnetocaloric material back to T (upper left
Credit
University of Groningen / Blake lab
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License
CC BY-SA