Performance assessment of a triangular microchannel active magnetic regenerator

Jierong Liang*, Kurt Engelbrecht, Kaspar Kirstein Nielsen, Konrad Loewe, Hugo Vieyra, Alexander Barcza, Christian R.H. Bahl

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The manufacturing process and mechanical instability of high performance magnetocaloric materials hamper the implementation of novel geometries for active magnetic regenerators. In this work, La(Fe,Si,Mn)13Hy is shaped into a regenerator with triangular microchannels with a hydraulic diameter of 200–300 μm using a process that results in a highly stable structure. The regenerator is characterized with regards to heat transfer, hydraulic resistance, magnetocaloric cooling and mechanical stability. The cooling performance is similar to conventional packed bed AMRs but with a significantly lower flow resistance. The chemical and mechanical stabilities are validated by comparisons of heat transfer effectiveness, pressure drop and magnetocaloric properties of the regenerator before and after long-term testing. The machining accuracy of microchannels with a brittle magnetocaloric material is therefore qualified. According to the performance evaluation criterion, this regenerator has a good potential for maximizing the operational coefficient of performance, with an estimated 42% improvement of COP in a specific magnetic refrigerator.

Original languageEnglish
Article number116519
JournalApplied Thermal Engineering
Volume186
Number of pages12
ISSN1359-4311
DOIs
Publication statusPublished - 2021

Keywords

  • Active magnetic regenerator
  • Cooling capacity
  • Friction factor
  • Heat transfer
  • Triangular microchannel

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