Predicting the dominating factors during heat transfer in magnetocaloric composite wires

Krautz, Maria; Beyer, Lukas; Funk, Alexander; Waske, Anja; Weise, Bruno; Freudenberger, J.; Gottschall, Tino

doi:10.1016/j.matdes.2020.108832

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…Tables 2-4 highlight the difference in thermal response between the considered cases, analysing the temperature difference between control and temperature dependent models. The temperature response for the first second in a cool-down process is of significant relevance as current magnetocaloric cycle simulations consider frequencies around 1 Hz [40,41]. ∆T t=1s and ∆T Max represent the temperature difference for t = 1s and the instant where this difference reaches its peak value, respectively.…”

Section: Resultsmentioning

confidence: 99%

Thermal Response of Magnetic Refrigerants: Combined Effect of Temperature Dependent Specific Heat and Thermal Conductivity

2022

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Device optimization plays a paramount role in current research on magnetic refrigeration. Solid state refrigerants have been characterized and numerical simulations assume a critical relevance in the development of magnetocaloric technology to have alternatives to vapour-compression systems whose operating elements have high global warming potential. Experimental studies have shown that the thermal properties of several magnetocaloric materials considerably change around their Curie temperatures (TC) and that this temperature dependency should not be dismissed. Current numerical research does not fully predict the complete thermal response of such materials, due to inaccuracies from neglecting the impact of combining both thermal conductivity (k) and specific heat (Cp) dependence on temperature. In this study, a simple unidimensional model includes k(T) and Cp(T) functions as input parameters, highlighting the relevance of considering temperature dependent thermophysical properties’ inputs when simulating the magnetic refrigerant’s heat transfer processes. The obtained results evidence that neglecting the temperature dependence of the magnetocaloric material thermophysical properties, namely its thermal conductivity and its specific heat, affects its temperature response, what may strongly affect the results after a succession of (hundreds or thousands) cycles.

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Section: Resultsmentioning

confidence: 99%

Thermal Response of Magnetic Refrigerants: Combined Effect of Temperature Dependent Specific Heat and Thermal Conductivity

2022

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“…[183] They found that the refinement of the ductile 𝛼-Fe particles plays a key role in hindering crack propagation and enhancing the mechanical strength. Moreover, to solve the brittleness issue after long cycling, Krautz et al applied a core-shell logic by introducing seamless austenitic steel wires with a magnetocaloric core, [190,191] as shown in Figure 7c. To this effect pre-alloyed La(Fe,Co,Si) 13 powder was filled into a AISI 316L austenitic steel tube, and then swaged to wires with an outer diameter of 1 mm.…”

Section: Me Coupled La(fesi) 13 Based Compoundsmentioning

confidence: 99%

Advanced Magnetocaloric Materials for Energy Conversion: Recent Progress, Opportunities, and Perspective

Zhang,

Miao,

van Dijk

et al. 2024

Advanced Energy Materials

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Solid‐state caloric effects as intrinsic thermal responses to different physical external stimuli (magnetic‐, uniaxial stress‐, pressure‐, and electric‐fields) can achieve a higher energy efficiency compared with traditional gas compression techniques. Among these effects, magnetocaloric energy conversion is regarded as the best available alternative and has been exploited extensively for promising application scenarios in the last decades. This review systematically introduces the magnetocaloric effect and its applications, and summarizes the corresponding representative magnetocaloric materials, as well as important progress in recent years. Specifically, the review focuses on some key understandings of the magnetocaloric effect by utilizing state‐of‐the‐art technical tools such as synchrotron X‐ray, neutron scattering, muon spin spectroscopy, positron annihilation spectroscopy, high magnetic fields, etc., and highlights their importance toward advanced materials design and development. An overview of the basic principles and applications of these advanced techniques on magnetocaloric materials is provided. Finally, the challenges and perspectives on further developments in this field are discussed. Further in‐depth understanding and manufacturing technology advancement combined with fast‐developed artificial intelligence and machine learning are expected to advance the magnetocaloric energy conversion technology closer to real applications.

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“…On the other hand, the magnetic field currently used in the prototypes of heat pumps are generated by NdFeB permanent magnets, which varies from 0.9 to 1.9 T [21][22][23][24]. The overall cost to reach a field of 1.9 T can be 10 times higher than the cost to reach a field of 0.9 T. It is therefore of interest to explore the lower magnetic field potential of the magnetic heat pump system.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low hysteresis in giant magnetocaloric Mn1-V Fe0.95(P,Si,B) compounds

Lai

You

Law

et al. 2023

Journal of Alloys and Compounds

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Predicting the dominating factors during heat transfer in magnetocaloric composite wires

Cited by 8 publications

References 20 publications

Thermal Response of Magnetic Refrigerants: Combined Effect of Temperature Dependent Specific Heat and Thermal Conductivity

Thermal Response of Magnetic Refrigerants: Combined Effect of Temperature Dependent Specific Heat and Thermal Conductivity

Advanced Magnetocaloric Materials for Energy Conversion: Recent Progress, Opportunities, and Perspective

Ultra-low hysteresis in giant magnetocaloric Mn1-V Fe0.95(P,Si,B) compounds

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