Looking for Energy Losses of a Rotary Permanent Magnet Magnetic Refrigerator to Optimize Its Performances
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Other documents of the author: Maiorino, Angelo; Mauro, Antongiulio; Del Duca, Manuel Gesù; Mota-Babiloni, Adrián; APREA, CIRO
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comunitat-uji-handle2:10234/7034
comunitat-uji-handle3:10234/8619
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Title
Looking for Energy Losses of a Rotary Permanent Magnet Magnetic Refrigerator to Optimize Its PerformancesAuthor (s)
Date
2019-11-19Publisher
MDPIBibliographic citation
MAIORINO, Angelo; MAURO, Antongiulio; DEL DUCA, Manuel Gesù; MOTA-BABILONI, Adrian; APREA, Ciro (2020). Looking for Energy Losses of a Rotary Permanent Magnet Magnetic Refrigerator to Optimize Its Performances. Energies, v. 12, issue 22, p.Type
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Abstract
: In this paper, an extensive study on the energy losses of a magnetic refrigerator prototype
developed at University of Salerno, named ‘8MAG’, is carried out with the aim to improve the
performance of such a system. ... [+]
: In this paper, an extensive study on the energy losses of a magnetic refrigerator prototype
developed at University of Salerno, named ‘8MAG’, is carried out with the aim to improve the
performance of such a system. The design details of ‘8MAG’ evidences both mechanical and
thermal losses, which are mainly attributed to the eddy currents generation into the support of
the regenerators (magnetocaloric wheel) and the parasitic heat load of the rotary valve. The latter
component is fundamental since it imparts the direction of the heat transfer fluid distribution through
the regenerators and it serves as a drive shaft for the magnetic assembly. The energy losses concerning
eddy currents and parasitic heat load are evaluated by two uncoupled models, which are validated
by experimental data obtained with different operating conditions. Then, the achievable coefficient of
performance (COP) improvements of ‘8MAG’ are estimated, showing that reducing eddy currents
generation (by changing the material of the magnetocaloric wheel) and the parasitic heat load
(enhancing the insulation of the rotary valve) can lead to increase the COP from 2.5 to 2.8 (+12.0%)
and 3.0 (+20%), respectively, and to 3.3 (+32%), combining both improvements, with an hot source
temperature of 22 ◦C and 2 K of temperature span. [-]
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Energies (2019), v. 12, n. 22Rights
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