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Study on material arrangement of multi-layered active magnetic regenerator with lanthanum compound materials.

Number: 0016

Author(s) : HANAOKA Y., MATSUBAYASHI D., KAWANAMI T., HITOSHI KANEKO G., FUKUDA J., KUME T.

Summary

In recent years, there has been much development and research on solid refrigerant heat pumps as a refrigeration technology placing a low environmental impact. Among them, a magnetic heat pump technology is known to have a higher theoretical COP than conventional vapor compression heat pump using gas refrigerant, and to have advantages in energy conservation. The challenges for the practical application of the magnetic heat pump are the expansion of the temperature spangenerated and the improvement of the refrigeration capacity. To solve these problems, the most crucial element of the magnetic heat pump cycle, the Active Magnetic Regenerator (AMR), must be improved in performance. The AMR has a packed structure filled with a magnetocaloric material that generates temperature changes. The magnetocaloric material filled in the AMR has the characteristic of generating peaks in a narrow temperature range, and as the temperature span increases, the AMR tends to shift out of the applicable temperature range of the material. Therefore, a multi-layered AMR structure was designed in which magnetocaloric materials with different operating temperature ranges are arranged sequentially according to the temperature range. The multi-layered structure allows each material to exhibit its characteristics of entropy change in different temperature ranges, and it is believed that a large temperature span and refrigeration capacity can be obtained. In this study, La-Fe-Si magnetocaloric materials with different Curie points were first prepared. Moreover, layered AMRs were fabricated using these materials. The effects of the packing amount and number of each material on the temperature span generation as well as the refrigeration capacity of the AMRs were investigated for these multi-layered AMRs. As a result, it was found that the generated temperature span was the largest when the multi-layered structure was under the condition of 1-1-1 of the volume ratio. On the other hand, the refrigeration capacity was found to be the highest when the multi-layer structure was under the condition of 3-1-3 of the volume ratio.

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Details

  • Original title: Study on material arrangement of multi-layered active magnetic regenerator with lanthanum compound materials.
  • Record ID : 30032624
  • Languages: English
  • Subject: Technology
  • Source: 10th IIR Conference on Caloric Cooling and Applications of Caloric Materials
  • Publication date: 2024/08/24
  • DOI: http://dx.doi.org/10.18462/iir.thermag.2024.0016

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