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1.
Production of artificial cold for industry, based on the magnetocaloric effect
Dorin Botoc, Ionut-Bogdan Rusu, Adrian Plesca, Jurij Avsec, 2020, original scientific article

Abstract: The most common current technology for producing artificial cold is based on the operation of gas compression and absorption, which was discovered more than a century ago. This technology uses refrigerants as a heat transfer agent. Magnetic refrigeration is an innovative technology that works based on the magnetocaloric effect and the properties of certain rare materials/metals. The present paper describes a simulation of the magnetocaloric effect (MCE) of a gadolinium plate (Gd.), which is the main component of the active magnetic regenerator (AMR). The first part includes a description and history of the discovery of the magnetocaloric effect of materials that possess such properties. The continuation is a COMSOL Multiphysics modelling of AMR's main component: a gadolinium (Gd) plate. The simulation of the magnetocaloric effects and the heat dispersion on its surface was done in COMSOL, as was the highlighting of the adiabatic temperature on the flat surface of the plate. Water was used as a heat transfer agent, and gadolinium (Gd) was used as a reference criterion for the materials. The model simulates a single step of the magnetic refrigeration cycle and evaluates the AMR's performance with a single board. This study enables identifying the most important characteristics that influence the active magnetic regenerator's thermal behaviour.
Keywords: energy efficiency, magnetocaloric material, magnetic refrigeration, active magnetic regenerator
Published in DKUM: 04.12.2023; Views: 220; Downloads: 4
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2.
Analysis and efficiency of a gadolinium magnetocaloric material plate
Dorin Botoc, Ionut-Bogdan Rusu, Adrian Plesca, Jurij Avsec, 2020, original scientific article

Abstract: In this article, the influence of a controlled magnetic field on gadolinium plates was modelled and simulated to be used in magnetic refrigeration installations. This is a state-of-the-art technology that does not use refrigerants and does not work based on vapour compression, which is based on the operation of the magnetocaloric properties of the material used; in the case below, this material, in the form of a flat plate, has certain magnetocaloric properties and under the influence of magnetic induction can be used successfully in such innovative installations. The advantages of using gadolinium in the form of a flat plate in a magnetic regenerator and thermal energy dissipation on its surface under the controlled magnetic field's influence were studied.
Keywords: gadolinium plate, magnetocaloric effect, magnetic flow, energetic efficiency
Published in DKUM: 04.12.2023; Views: 225; Downloads: 3
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3.
The properties of the material gadolinium and the working agent used in the installation of magnetic refrigeration devices
Dorin Botoc, Jurij Avsec, Adrian Plesca, Georgel Gabor, Rusu Ionut, 2020, professional article

Abstract: Much remains to be done to understand better and thus achieve better control over magnetic materials to maximize their magnetocaloric properties and performance, specifically for gadolinium. A clear path forward is highlighted by thorough experiments coupled with theory, in which the latter is tested and re%ned against the former, thus resulting in discoveries of new and improved materials and bringing near-room-temperature magnetic refrigeration technology to fruition in the near future.
Keywords: Gadolinium, heat transfer, magneto-calorific, magnetic field
Published in DKUM: 01.12.2023; Views: 352; Downloads: 4
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4.
Modelling of magnetic regenerator and heat transfer agent in microchannels
Dorin Botoc, Bianca Eliza Oneata, Rusu Ionut, Alexandru Salceanu, Jurij Avsec, 2021, original scientific article

Abstract: In this article, a brief introduction of conventional refrigeration is given, followed by a description and history of magnetic refrigeration. The active magnetic regenerator comprises 12 parallel plates of magnetocaloric material (gadolinium (Gd)), through which circulates the heat transfer fluid (water, in this case). At both ends of the regenerator are the heat exchangers. The hot heat exchanger (HHEX) and the cold heat exchanger (CHEX) connects the fluid to the heat sources. The principle of operation of a magnetic refrigeration installation is based on exploiting the magnetocaloric effect from the materials that possess these properties (in this case, Gd).
Keywords: magnetic refrigeration, active magnetic regenerator, magnetocaloric material
Published in DKUM: 10.11.2023; Views: 296; Downloads: 3
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