Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 53, Issue 11, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2017.2698022
Keywords
Composite; heat exchanger; La(Fe,Mn,Si)(13)H-x; magnetocaloric; metal bonded
Funding
- DFG [SPP 1599]
- European Community 7th Framework Program [310748 DRREAM]
- Increase Competitiveness Program of NUST MISiS [K4-2015-013]
- RSE [N15-12-10008]
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Hydrogenated La(Fe, Mn, Si)(13)-based alloys have an excellent magnetocaloric properties, but poor mechanical and chemical stability. This hinders their direct machining and implementation in an active magnetic regenerator (AMR). In this paper, we show how machinability and corrosion protection of the particles can be improved by a hot-dip coating. To avoid the loss of hydrogen during the coating process, a low melting temperature eutectic Bi-Sn-In alloy was selected as a metal binder. The coated particles were used to build a packed bed regenerator as an array of fixed particles, avoiding such negative effects as sedimentation, segregation, and channel deformation. Similarity theory, combined with unsteady heat transfer approach was applied in order to calculate the optimal operation frequency and to estimate the maximal cooling power of the magnetocaloric regenerators. Two different geometries of heat exchangers were theoretically compared: stacked flat plate/channel structure and packed bed of equidimensional spherical particles. It is shown that, operating at low frequency, the same amount of magnetocaloric material can expel bigger amount of heat, when formed as packed bed heat exchangers. The metal-bonded packed bed regenerator made from La(Fe, Mn, Si)(13)H-x powder was tested in a home-build versatile testing device in a magnetic field change of 10 kOe. The maximal achievable temperature span as a function of both parameters-hot end temperature and length of regenerator-was explored. The largest thermal span of 8 K was produced by the regenerator with 40 mm length.
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