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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Enhancing the Frequency of Magnetic Refrigerators Using Dummy Regenerators
Submission Author:
Elias Pagnan , SC , Brazil
Co-Authors:
Elias Pagnan, Luis Felipe Cattelan, Guilherme Fidelis Peixer, Anderson Lorenzoni, Gislaine Hoffmann, Maria Claudia Régio e Silva, Alan Nakashima, Jaime Lozano, Jader Riso Barbosa Jr.
Presenter: Elias Pagnan
doi://10.26678/ABCM.ENCIT2022.CIT22-0429
Abstract
Magnetic Refrigeration (MR) has emerged as one of the most viable alternatives to vapor compression refrigeration, attracting interest from both industry and academia. Yet, even after decades of research and development, the technology is not commercially available and the prototypes did not achieve the expected thermodynamic performance. Among several factors, one can highlight the fact that in rotary Magnetic Circuit (MC) devices the magnetic interaction between the Active Magnetic Regenerators (AMR) and MC is responsible for generating high torques to rotate the MC. Such high torque requirements prevent the operation of the MR systems at high frequencies, limiting it to a few Hertz. With that in mind, the present work proposes the application of the so-called dummy regenerators (DRs), which are composed by particles of non-magnetocaloric soft ferromagnetic materials, positioned between an array of eight non-contiguous AMRs. The objective of the DRs is to reduce the maximum torque associated with the rotation of the MC and enhance the operating frequency of magnetic refrigeration systems. Among several results, the application of the DRs reduced the peak values of the torque associated with the rotation of the MC by 75% and enabled the maximum system frequency to be increased from 0.75 Hz up to 1.64 Hz.
Keywords
Magnetic refrigerator, active magnetic regenerator, magnetic circuit, performance enhancement
