Initial experimental results from a rotary permanent magnet magnetic refrigerator

Aprea, Ciro; Greco, Adriana; Maiorino, Angelo; Mastrullo, R.; Tura, A.

doi:10.1016/j.ijrefrig.2014.03.014

Cited by 52 publications

(30 citation statements)

References 32 publications

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“…As well as Lionte et al suggested in their work [26], this model is able to replicate the thermofluidodynamic behavior of the refrigerating system, (RPMMR) named 8Mag [28], so that a comparison [29][30][31] between the model and the RPMMR can be performed.…”

Section: Introductionmentioning

confidence: 90%

A comparison between experimental and 2D numerical results of a packed-bed active magnetic regenerator

Aprea

Cardillo

Greco

et al. 2015

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 90%

A comparison between experimental and 2D numerical results of a packed-bed active magnetic regenerator

Aprea

Cardillo

Greco

et al. 2015

Applied Thermal Engineering

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“…The MagnetoCaloric Effect (MCE) is a physical phenomenon detected for the first time in iron, in 1881 [21], as temperature change in the material by varying the intensity of the magnetic field applied, under adiabatic conditions. The entropy of a magnetic solid at constant pressure S(T, H) is a function of both the magnetic field intensity H and the absolute temperature T and it consists of three contributions: magnetic (SM), lattice (Slat) and electronic (Sel) ones:…”

Section: Magnetocaloric Effect and Amr Cyclementioning

confidence: 99%

Analyzing the energetic performances of AMR regenerator working with different magnetocaloric materials: Investigations and viewpoints

Aprea¹,

Greco²,

Maiorino³

et al. 2017

IJHT

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Magnetic refrigeration is an ecofriendly solid state technology employing magnetocaloric materials in an Active Magnetic Regenerating refrigerant cycle (AMR), a Brayton-based thermodynamical cycle. Magnetic refrigeration is based on magnetocaloric effect (MCE), a physical phenomenon that couples an external magnetic field with the magnetic moments of magnetocaloric materials. In the case of ferromagnetic materials, MCE is a warming as the magnetic moments of the atom are aligned by the application of a magnetic field, and the corresponding cooling upon removal of the magnetic field. Gadolinium is the benchmark material for magnetic refrigeration in room temperature range, thanks to its marked magnetocaloric effect which is maximum at 294 K. In this paper the results of numerical investigations on magnetocaloric materials are presented: the energetic performances of different magnetocaloric materials have been investigated through a two-dimensional model of an AMR regenerator. The model has been previously experimentally validated with a Rotary Permanent Magnet Magnetic Refrigerator. Exploring the behavior of the regenerator under variable working condition, a performance map has been obtained for gadolinium. The results, collected in terms of temperature span, coefficient of performance and mechanical power associated to circulation pump, lead to formulize viewpoints on employing magnetocaloric materials under optimized AMR working conditions.

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“…Indeed, a preliminary campaign by numerical simulation has been carried out to identify the optimal cycle frequency. The secondary fluid is deionized water that flows in the channels between the plates [45][46][47][48][49].…”

Section: Regenerator Geometrymentioning

confidence: 99%

“…The two-dimensional numerical model introduced in this paper has been validated through a comparison between the result collected and experimental ones, obtained by carrying out the results from a Rotary Permanent Magnet Magnetic Refrigerator (RPMMR), developed at the Refrigeration Lab (LTF), University of Salerno [44,[46][47][48][49]. RPMMR is the first Italian prototype of magnetic refrigerator: it is composed by 8 regenerators, fixed radially in a stationary ring, whom is subjected to a variable magnetic field, generated by the rotation of permanent magnets.…”

Section: Validation Of the Modelmentioning

confidence: 99%

A comparison between electrocaloric and magnetocaloric materials for solid state refrigeration

Aprea¹,

Greco²,

Maiorino³

et al. 2017

IJHT

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Electrocaloric and magnetic refrigeration are two emerging, solid-state based technology, which could constitute a real chance to overcome vapor compression refrigeration limits. To underline the differences and the affinities concerning such solid-state techniques, in this paper electrocaloric and magnetic refrigeration are compared through some performance parameters. For this purpose, it has been introduced a two-dimensional model, capable to reproduce, in room temperature range, the behaviors of both AMR and AER parallel plates regenerator. AMR and AER are the acronyms of Active Magnetic/Electrocaloric Regenerative cycle, respectively, which are inverse Brayton based thermodynamical cycles. In the model have been tested as refrigerant the most promising magnetic and electrocaloric materials, like Gd, Gd5(SixGe1-x)4, LaFe11.384 Mn0.356Si1.26H1.52, LaFe11.05Co0.94Si1.10, as magnetocaloric, P(VDF-TrFE-CFE)/BSTs, 0.93PMN-0.07PT, PLZTs, as electrocaloric ones. Among them, the PLZT thin film class confers the best results, higher than every magnetocaloric material tested, conferring to electrocaloric refrigeration the real role of the environmental friendly technology of the future.

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Initial experimental results from a rotary permanent magnet magnetic refrigerator

Cited by 52 publications

References 32 publications

A comparison between experimental and 2D numerical results of a packed-bed active magnetic regenerator

A comparison between experimental and 2D numerical results of a packed-bed active magnetic regenerator

Analyzing the energetic performances of AMR regenerator working with different magnetocaloric materials: Investigations and viewpoints

A comparison between electrocaloric and magnetocaloric materials for solid state refrigeration

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