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Magnetic Air Conditioners: A High Tech Way Of Keeping Cool

How will magnetic air conditioners work?

Magnetic air conditioners cool the air by quickly and repeatedly exposing a magnetocaloric material to a magnetic field. In one prototype designed by Astronautics Corporation of America in conjunction with the U.S. DOE's Ames (Iowa) Laboratory, a wheel containing the rare-Earth element gadolinium spins through the field of a stationary magnet. As the disk spins, the gadolinium alloy heats up, then cools as it passes through a gap in the field, cooling the water that surrounds it as it makes its trip.