Conference Paper Experimental study of room temperature magnetic refrigerator using multilayered magnetocaloric materials


Railway technical research institute has been studying a magnetic refrigerator for trains’ air conditioners. Conventional air conditioners in Japanese trains have a cooling capacity of 25 kW, the electric consumption of 10 kW and the coefficient of performance of 2.5. Hydro-CFCs are used in the conventional air-conditioners. The development of HCFC free systems or the usage of substances which have little greenhouse effect is required because the problem with HCFC is the global warming. Therefore, there are a lot of researches on air-conditioning systems with less influence on the environment. Magnetic refrigeration technology has a potential for high efficiency without use of Freon gases. A prototype magnetic refrigerator has been developed, which consists of fixed active magnetic regenerator (AMR) beds and Halbach arrayed NdFeB magnets with a peak field of 1.5 Tesla rotating over the beds. Each bed was packed with sphere Gd or Gd-based compounds. The system has a maximum cooling capacity of 1.4 kW. Several cascade patterns of the packed materials in the AMR beds were evaluated and a maximum temperature span of 21 K was obtained.

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