Magnets may act as wireless cooling agents in Laptop and Refrigerator https://youtube/watch?v=De1Xo0lkKGg&list=PLK2ccNIJVPpB_XqWWq_oaZGIDzmKiSkYc The magnets cluttering the face of your refrigerator may one day be used as cooling agents according to a new theory formulated by MIT researchers. The theory describes the motion of magnons, i-e the quasi-particles in magnets that are collective rotations of magnetic moments, or “spins.” In addition to the magnetic moments, magnons also conduct heat. The researchers came up with two new equations to describe magnon transport. With these equations, they predicted a new magnon cooling effect, similar to the thermoelectric cooling effect. From their equations, the MIT researchers found that, when exposed to a magnetic field gradient, magnons may be driven to move from one end of a magnet to another, carrying heat with them and producing a cooling effect. In theory, such a magnetically driven refrigerator would require no moving parts, unlike conventional iceboxes that pump fluid through a set of pipes to keep things cool. According to the researchers, You can pump heat from one side to the other, so you can essentially use a magnet as a refrigerator. And, You can envision wireless cooling where you apply a magnetic field to a magnet one or two meters away to cool your laptop. The first application for magnon cooling may be for scientists working on projects that require wireless cooling at extremely low temperatures. At this stage, potential applications are in cryogenics — for example, cooling infrared detectors. According to the researchers, there’s still a long way to go for thermoelectrics to compete with traditional technologies. Studying the magnetic degree of freedom could potentially help optimize existing systems and improve the thermoelectric efficiency. #technology #innovation
Posted on: Sun, 31 Aug 2014 09:03:31 +0000
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