Study of multi-layer active magnetic regenerators using magnetocaloric materials with first and second order phase transition: Paper

Tian Lei, Kurt Engelbrecht, Kaspar Kirstein Nielsen, Henrique Neves Bez, Christian Bahl

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Magnetocaloric materials (MCM) with a first order phase transition (FOPT) usually exhibit a large, although sharp, isothermal entropy change near their Curie temperature, compared to materials with a second order phase transition (SOPT). Experimental results of applying FOPT materials in recent magnetocaloric refrigerators (MCR) demonstrated the great potential for these materials, but a thorough study on the impact of the moderate adiabatic temperature change and strong temperature dependence of the magnetocaloric effect (MCE) is lacking. Besides, comparing active magnetic regenerators (AMR) using FOPT and SOPT materials is also of fundamental interest. We present modeling results of multi-layer AMRs using FOPT and SOPT materials based on a 1D numerical model. First the impact of isothermal entropy change, adiabatic temperature change and shape factor describing the temperature dependence of the MCE are quantified and analyzed by using artificially built magnetocaloric properties. Then, based on measured magnetocaloric properties of La(Fe,Mn,Si)13H y and Gd, an investigation on how to layer typical FOPT and SOPT materials with different temperature spans is carried out. Moreover, the sensitivity of variation in Curie temperature distribution for both groups of AMRs is investigated. Finally, a concept of mixing FOPT and SOPT materials is studied for improving the stability of layered AMRs with existing materials.
Original languageEnglish
Article number345001
JournalJournal of Physics D: Applied Physics
Volume49
Issue number34
Number of pages10
ISSN0022-3727
DOIs
Publication statusPublished - 2016

Keywords

  • Magnetic refrigeration
  • Active magnetic regenerator
  • Magnetocaloric material
  • Magnetic phase transition

Fingerprint Dive into the research topics of 'Study of multi-layer active magnetic regenerators using magnetocaloric materials with first and second order phase transition: Paper'. Together they form a unique fingerprint.

Cite this