A rotary permanent magnet magnetic refrigerator based on AMR cycle

Aprea, Ciro; Cardillo, Gerardo; Greco, Adriana; Maiorino, Angelo; Masselli, Claudia

doi:10.1016/j.applthermaleng.2016.01.097

Cited by 58 publications

(24 citation statements)

References 21 publications

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“…A group of channels is formed by stacking particles in the regenerator area: the fluid flows through these interstitial channels. The regenerator's geometry has been chosen according to the characteristics of one of the eight regenerators of the experimental prototype developed at the Refrigeration Lab in the University of Salerno in collaboration with the University of Naples Federico II [9][10][11][12][13]. In this model both the fluid flow and heat transfer between the solid and the fluid have been taken in account.…”

Section: Description Of the 2d Modelmentioning

confidence: 99%

Magnetic refrigeration: A comparison between MnAs and FeRh based alloys in the room temperature range

Aprea¹,

Greco²,

Maiorino³

et al. 2018

TI-IJES

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This paper describes a two-dimensional (2D) multiphysics model of a parallel plate regenerator made of magnetocaloric material. The regenerator operates as a refrigerant for a magnetic refrigerator operating at room temperature on the strength of an Active Magnetic Regenerator (AMR) cycle. The model is able to simulate the thermofluidodynamic behavior of the magnetocaloric material and the magnetocaloric effect of the refrigerant. With this model direct (MnFeP0.45As0.55) and inverse (Fe49Rh51) magnetocaloric materials have been investigated. The tests were performed with fixed AMR cycle frequency (1.25 Hz), cold heat exchanger temperature (310 K), hot heat exchanger temperature (318 K), while secondary fluid flow rate was varied in the range 0.034÷0.057 kg/s. The secondary fluid used for simulations is liquid water. The results, generated for a magnetic induction which varies from 0 to 1.5 T, are presented in terms of temperature span, refrigeration power and coefficient of performance. Results clearly show that the best material from an efficiency's point of view is Fe49Rh51 which exhibits the highest values of ΔTspan, Qref and COP. Instead MnFeP0.45As0.55 shows, in this temperature range (centered around its Curie point), values of ΔTspan, Qref and COP too low for any kind of practical application.

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Section: Description Of the 2d Modelmentioning

confidence: 99%

Magnetic refrigeration: A comparison between MnAs and FeRh based alloys in the room temperature range

Aprea¹,

Greco²,

Maiorino³

et al. 2018

TI-IJES

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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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“…In this paper, we introduce a numerical study conducted on an active barocaloric refrigerator operating with a vulcanizing rubber, which employed glycol-based nanofluids as auxiliary fluid. The tool employed for the investigation was a two-dimensional model of a parallel-plates active caloric regenerator, which was already validated experimentally in our previous investigations [16,67,68]. The analysis is focused mainly on the heat transfer performances of the regenerator.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Heat Transfer in an Active Barocaloric Cooling System Using Ethylene-Glycol Based Nanofluids as Secondary Medium

et al. 2019

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Barocaloric cooling is classified as environmentally friendly because of the employment of solid-state materials as refrigerants. The reference and well-established processes are based on the active barocaloric regenerative refrigeration cycle, where the solid-state material acts both as refrigerant and regenerator; an auxiliary fluid (generally water of water/glycol mixtures) is used to transfer the heat fluxes with the final purpose of subtracting heat from the cold heat exchanger coupled with the cold cell. In this paper, we numerically investigate the effect on heat transfer of working with nanofluids as auxiliary fluids in an active barocaloric refrigerator operating with a vulcanizing rubber. The results reveal that, as a general trend, adding 10% of copper nanoparticles in the water/ethylene-glycol mixture carries to +30% as medium heat transfer enhancement.Energies 2019, 12, 2902 2 of 15 effects (ECE) [20][21][22], and mechanical fields provoke elastocaloric (eCE) [23] or barocaloric effects (BCE) [24], respectively, as consequences of stretching or of hydrostatic pressure application.Caloric cooling is classified as environmentally friendly because it employs solid-state materials as refrigerants that do not directly impact global warming since they do not disperse in the atmosphere, as confirmed by a certain number of investigations [25][26][27][28] that asserted the eco-friendliness of all the techniques belonging to magneto- [29,30], electro-[31,32], elasto-[33,34], and baro-caloric [35] cooling.The reference and well-established systems for caloric cooling are based on the active caloric regenerative refrigeration (ACR) cycle, a thermodynamic Brayton-based cycle in which the caloric solid-state material acts as both the refrigerant and the regenerator, thus recovering heat fluxes through the help of an auxiliary fluid that vehiculates them with the final purpose of subtracting heat from the cold heat exchanger (and therefore the cold environment) [36]. To improve the efficiency of a caloric cooler, the ACR system works with the optimal operative parameters (such as the geometry of the regenerator, the fluid velocity, and the frequency of the cycle) [37-39] but the bottleneck is employing materials due of high caloric effect in the temperature range toward the application is devoted to [40]. A very wide "chapter" is currently open in the research panorama regarding the efforts to realize suitable caloric effect materials. A huge number of studies have been conducted over the last decades, and several promising materials have been identified for each specific caloric technique [41][42][43].Magnetocaloric is the most mature solid-state cooling technique [44,45], as it was the first to be investigated; however, there are still inherent limitations and holdups in creating high-intensity magnetic fields by permanent magnet application [46,47]. More recently, electrocaloric and elastocaloric techniques have gained interest in the scientific community-certain objectives are being reached, and many prototypes...

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A rotary permanent magnet magnetic refrigerator based on AMR cycle

Cited by 58 publications

References 21 publications

Magnetic refrigeration: A comparison between MnAs and FeRh based alloys in the room temperature range

Magnetic refrigeration: A comparison between MnAs and FeRh based alloys in the room temperature range

A comparison between electrocaloric and magnetocaloric materials for solid state refrigeration

Enhancing the Heat Transfer in an Active Barocaloric Cooling System Using Ethylene-Glycol Based Nanofluids as Secondary Medium

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