Innovative ideas for future research on magnetocaloric technologies

Kitanovski, Andrej; Egolf, Peter W.

doi:10.1016/j.ijrefrig.2009.11.005

Cited by 184 publications

(83 citation statements)

References 12 publications

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“…In this context, energy conversion machines based on the magnetocaloric effect (MCE) represent one of the most promising areas to be developed. [1][2][3][4] The MCE is the entropy or temperature variation in isothermal or adiabatic conditions, respectively, resulting from the perturbation of the system due to the action of a magnetic field. 2,5 The MCE is maximum across magnetic critical processes such as second and especially first order magnetic phase transitions.…”

Section: Introductionmentioning

confidence: 99%

Direct magnetocaloric characterization and simulation of thermomagnetic cycles

Porcari

Buzzi²,

Cugini³

et al. 2013

Review of Scientific Instruments

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An experimental setup for the direct measurement of the magnetocaloric effect capable of simulating high frequency magnetothermal cycles on laboratory-scale samples is described. The study of the magnetocaloric properties of working materials under operative conditions is fundamental for the development of innovative devices. Frequency and time dependent characterization can provide essential information on intrinsic features such as magnetic field induced fatigue in materials undergoing first order magnetic phase transitions. A full characterization of the adiabatic temperature change performed for a sample of Gadolinium across its Curie transition shows the good agreement between our results and literature data and in-field differential scanning calorimetry. © 2013 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

Direct magnetocaloric characterization and simulation of thermomagnetic cycles

Porcari

Buzzi²,

Cugini³

et al. 2013

Review of Scientific Instruments

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“…Despite their properties, Gd 5 (Si x Ge 1Àx ) 4 materials were left behind in the nanoscalling race, whereas an increasing number of works have been published on Gd multilayers, 27,28 manganites, [29][30][31] FeRh, 32,33 NiMnGa, 34 and MnAs 35,36 materials and also on the MEMS development and numerical simulations. 22,[37][38][39][40] Concerning the Gd 5 (Si x Ge 1Àx ) 4 materials, there is only one not-successful report of a Gd 5 (Si x Ge 1Àx ) 4 thin film. 41 Our group has been developing and optimizing the Gd 5 (Si x Ge 1Àx ) 4 thin film deposition by femtosecond pulsed laser ablation technique, but, so far, with low amounts of desired phase and no signs of magnetostructural transition.…”

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confidence: 99%

Gd5(Si,Ge)4 thin film displaying large magnetocaloric and strain effects due to magnetostructural transition

Hadimani

Silva

Pereira

et al. 2015

Applied Physics Letters

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Magnetic refrigeration based on the magnetocaloric effect is one of the best alternatives to compete with vapor-compression technology. Despite being already in its technology transfer stage, there is still room for optimization, namely, on the magnetic responses of the magnetocaloric material. In parallel, the demand for different magnetostrictive materials has been greatly enhanced due to the wide and innovative range of technologies that emerged in the last years (from structural evaluation to straintronics fields). In particular, the Gd5(SixGe1−x)4 compounds are a family of well-known alloys that present both giant magnetocaloric and colossal magnetostriction effects. Despite their remarkable properties, very few reports have been dedicated to the nanostructuring of these materials: here, we report a ∼800 nm Gd5Si2.7Ge1.3 thin film. The magnetic and structural investigation revealed that the film undergoes a first order magnetostructural transition and as a consequence exhibits large magnetocaloric effect (−ΔSmMAX ∼ 8.83 J kg−1 K−1, ΔH = 5T) and giant thermal expansion (12000 p.p.m). The thin film presents a broader magnetic response in comparison with the bulk compound, which results in a beneficial magnetic hysteresis reduction. The ΔSmMAX exhibited by the Gd5(Si,Ge)4 thin film makes it a promising candidate for micro/nano magnetic refrigeration area.

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“…Firstly model V, a conventional AMR design using parallel plate regenerators and an aqueous solution as heat transfer fluid. Secondly model D, a novel design proposed in Kitanovski and Egolf (2010) and further developed by Nissan (Tasaki et al 2012) utilizing the conceptual properties of thermal switches to avoid the use of a heat transfer fluid.…”

Section: Modelmentioning

confidence: 99%

“…The main factors influencing the performance in both approaches have been studied and compared. The focus has been on variations of thermal conduction and thermal convection as it is recognized in the field to represent an important bottleneck (Kitanovski and Egolf, 2010). …”

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confidence: 99%

Modeling of in-vehicle magnetic refrigeration

Olsen

Bahl

Nielsen

et al. 2014

International Journal of Refrigeration

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A high-performance magnetic refrigeration device is considered as a potential technology for invehicle air conditioners in electric vehicles. The high power consumption of a conventional air conditioner in an electric vehicle has considerable impacts on cruising distance. For this purpose the demands on cooling power density, temperature difference between hot and cold side, transient properties and COP, will be high. INTRODUCTIONNumerical simulations have been performed to explore the feasibility of in-vehicle magnetic refrigeration. An ambitious goal of comparatively high cooling power density and large temperature difference between the hot and cold sides has been set. The goal has been deemed necessary to place magnetic refrigeration as a viable option for electrical vehicles. In order to reach the goal an open-minded parameter search has explored the limitations of multiple systems, both conceptual and well-established. One set of simulations has been made stretching the parameter space of a conventional AMR device (Bahl et al 2008) and another has been made considering a novel solid state approach (Tasaki et al. 2012). Extreme material properties have been invoked to fix performance boundaries and aid to find the most promising development paths. Both sets of simulations uses algorithms based on a 1D approach (Engelbrecht et al, 2005) employ the use of Curie temperature graded magnetocaloric materials stressing the importance of accurate control of the Curie temperature in order to employ multiple materials in reaching the goal. The main factors influencing the performance in both approaches have been studied and compared. The focus has been on variations of thermal conduction and thermal convection as it is recognized in the field to represent an important bottleneck (Kitanovski and Egolf, 2010).

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Innovative ideas for future research on magnetocaloric technologies

Cited by 184 publications

References 12 publications

Direct magnetocaloric characterization and simulation of thermomagnetic cycles

Direct magnetocaloric characterization and simulation of thermomagnetic cycles

Gd5(Si,Ge)4 thin film displaying large magnetocaloric and strain effects due to magnetostructural transition

Modeling of in-vehicle magnetic refrigeration

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