Sensitivity study of multi-layer active magnetic regenerators using first order magnetocaloric material La(Fe,Mn,Si)13Hy

Tian Lei, Kaspar Kirstein Nielsen, Kurt Engelbrecht, Christian R. H. Bahl, Henrique Neves Bez, Christian T. Veje

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Abstract

We present simulation results of multi-layer active magnetic regenerators using the solid-state refrigerant La(Fe,Mn,Si)13Hy. This material presents a large, however quite sharp, isothermal entropy change that requires a careful choice of number of layers and working temperature for multi-layer regenerators. The impact of the number of layers and the sensitivity to the working temperature as well as the temperature span are quantified using a one dimensional numerical model. A study of the sensitivity of variation in Curie temperature through a uniform and normal distribution is also presented. The results show that the nominal cooling power is very sensitive to the Curie temperature variation in the multi-layer regenerators. A standard deviation of the Curie temperature variation for a normal distribution less than 0.6 K is suggested in order to achieve sufficient performance of a 15-layer regenerator with Curie temperature spacing of 2 K.
Original languageEnglish
Article number014903
JournalJournal of Applied Physics
Volume118
Issue number1
Number of pages8
ISSN0021-8979
DOIs
Publication statusPublished - 2015

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