Design and performance of a permanent-magnet rotary refrigerator

Zimm, C. B.; Boeder, A; Chell, Jeremy; Sternberg, A.; Fujita, Akira; Fujieda, Shun; Fukamichi, K.

doi:10.1016/j.ijrefrig.2006.07.014

Cited by 205 publications

(95 citation statements)

References 5 publications

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“…Several groups have tested the cooling effect in devices near room temperature. Zimm et al [72] carried out a preliminary test by using irregular La(Fe 0.88 Si 0.12 ) 13 H 1.0 particles of 250∼500 μm in size as refrigerants in a rotary magnetic refrigerator (RMR) and found that cooling capacity of La(Fe 0.88 Si 0.12 ) 13 H 1.0 compares favorably with that of Gd. Fujita et al [73] tested the hydrogenated La(Fe 0.86 Si 0.14 ) 13 spheres with an average diameter of 500μm in an AMR-type test module, and observed a clear difference in temperature between both the ends of the AMR bed.…”

Section: Progress In Practical Applicationsmentioning

confidence: 99%

Recent Progress in Exploring Magnetocaloric Materials

et al. 2009

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Magnetic refrigeration based on the magnetocaloric effect (MCE) of materials is a potential technique that has prominet advantages over the currently used gas compression-expansion technique in the sense of its high efficiency and environment friendship. In this article, our recent progress in explorating effective MCE materials is reviewed with the emphasis on the MCE in the LaFe 13-x Si x -based alloys with a first order magnetic transition discovered by us. These alloys show large entropy changes in a wide temperature range near room temperature. Effects of magnetic rare-earth doping, interstitial atom, and high pressure on the MCE have been systematically studied. Special issues such as appropriate approaches to determining the MCE associated with the first-order magnetic transition, the depression of magnetic and thermal hystereses, and the key factors determining the magnetic exchange in alloys of this kind are discussed. The applicability of the giant MCE materials to the magnetic refrigeration near ambient temperature is evaluated. A brief review of other materials with significant MCE is also presented in the article.

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Section: Progress In Practical Applicationsmentioning

confidence: 99%

Recent Progress in Exploring Magnetocaloric Materials

et al. 2009

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“…[5][6][7][8] Recently, nanotechnology has enriched the quest for advance magnetocaloric materials utilizing nanocomposition for materials design. [9][10][11][12][13] Despite the innovation in the field of magnetocaloric materials science through the nanotechnological approach, the scientific community kept looking at the problem from the conventional perspective of employing the MCE by exposing the active magnetocaloric material to an external magnetic field.…”

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confidence: 99%

Near-room-temperature refrigeration through voltage-controlled entropy change in multiferroics

Binek

Burobina

2013

Applied Physics Letters

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Composite materials with large magnetoelectric effect are proposed for application in advanced near-room-temperature refrigeration. The key innovation rests on utilizing the magnetocaloric effect in zero applied magnetic fields. This approach promises sizable isothermal entropy change and virtually temperature-independent refrigerant capacity through pure voltage-control. It is in sharp contrast with the conventional method of exploiting the magnetocaloric effect through applied magnetic fields. We outline the thermodynamics and estimate an isothermal entropy change specifically for the La0.7Sr0.3MnO3/Pb(Mg1/3Nb2/3)O3-PbTiO3(001) two-phase composite material. Finally, we propose structural variations of two-phase composites, which help in overcoming the challenging task of producing nanostructured material in macroscopic quantities.

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“…4 An appreciable magnetocaloric effect (MCE) with sizable isothermal entropy change and adiabatic temperature change in moderate applied magnetic fields requires new magnetic materials with tailored magnetocaloric properties. Most of the contemporary on-going research focuses on the giant MCE found in bulk rare-earth alloys.…”

Section: Introductionmentioning

confidence: 99%

Spin and elastic contributions to isothermal entropy change

Mukherjee

Skomski

Michalski

et al. 2012

Journal of Applied Physics

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Statistical considerations of ensembles of localized magnetic moments reveal an upper bound of the isothermal entropy change when only the magnetic degrees of freedom are considered. In this case, the maximum molar isothermal entropy change is determined by the spin multiplicity and is equal to Rln(2J þ 1), where J is the angular momentum of an individual atom. However, in materials with giant magnetocaloric effect, the isothermal field-induced entropy change goes beyond the spin-multiplicity limit due to field-activated elastic degrees of freedom. Recently, we investigated a model of pairs of exchange-coupled Ising spins with variable real-space positions. We showed, within a classical approximation for the elastic degree of freedom, that a vibrational entropy contribution can be activated via applied magnetic fields. Here we quantify the impact of quantum corrections in the low-temperature limit. We compare calculations that include elastic interaction with the rigid exchange model in the high-temperature limit. We find that quantum effects provide quantitative corrections in the low-temperature limit. In addition we show that the elastic contributions to the isothermal entropy change can be additive but, remarkably, it can also give rise to reduced isothermal entropy change in certain temperature regions.

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Design and performance of a permanent-magnet rotary refrigerator

Cited by 205 publications

References 5 publications

Recent Progress in Exploring Magnetocaloric Materials

Recent Progress in Exploring Magnetocaloric Materials

Near-room-temperature refrigeration through voltage-controlled entropy change in multiferroics

Spin and elastic contributions to isothermal entropy change

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