Improving magnetic refrigerator performances by enhancing convection heat transfer with staggered twin-wedged elements

You, Yonghua; Wu, Zhongda; Chen, Pingan; Hu, Jiang; Zeng, Xican; Xu, Xuecheng; Dai, Fangqin

doi:10.1016/j.applthermaleng.2017.12.127

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…Lei et al also fabricated a five‐layer regenerator from epoxy‐bonded La(Fe,Mn,Si) 13 H y particles. In addition, a numerical analysis of twin‐wedge wires was recently performed by You et al, while Sheng et al conducted a comprehensive experimental study, based on which they designed various Gd 20 Ho 20 Er 20 Al 20 TM 20 (TM = Fe, Co, and Ni) microwires with different diameters. The smallest microwire had a diameter of <60 µm and length of a few meters.…”

Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

349

156

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The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

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Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

349

156

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“…Parallel plates are more difficult to develop compared to packed spheres, although the pressure drop of the passing fluid is considerably smaller. Other geometries have been considered but to a minor extent: honeycomb, 45 wire‐based, 46,47 micro‐channels, 48,49 packed screen bed, 48 freeze‐cast, 48,50 twin‐wedged, 51 or corrugated tube based 52,53 …”

Section: Introductionmentioning

confidence: 99%

Caloric devices: A review on numerical modeling and optimization strategies

2021

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Summary The discovery of giant caloric effects and further investigation on device systems that can compete with current heat management technologies in terms of efficiency have led to a major increase in modeling investigations. These models have been crucial in designing the most efficient, cheap, and robust setups with reliable performances. One example is the modeling of magnetic refrigerators and heat pumps that has been used in the optimization of critical geometrical parameters of magnetocaloric regenerators. In this paper, we review the model components of caloric heat pump and refrigerator systems, including field generation, heat transfer, caloric effects, fluid dynamics, and loss mechanisms. We also review the optimization strategies used so far, which are based on sensitive analysis, brute force approaches, statistical learning, and genetic algorithms. The analysis is applied to magnetocaloric, electrocaloric, elastocaloric, and barocaloric systems.

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“…In addition to developing new MCMs [ 4 , 5 ], scholars and scientists have made great efforts to improve magnetic refrigerator performance from various aspects, such as efficient magnets [ 6 , 7 , 8 ], advanced refrigeration cycles [ 9 , 10 ], heat transfer enhancement [ 11 , 12 , 13 , 14 , 15 ], smart mechanical design [ 16 , 17 , 18 , 19 , 20 ], and optimal control [ 21 , 22 ]. On the other hand, in addition to building prototypes for experiments [ 23 , 24 ], various 1D and 2D numerical models, based on solving the energy conservation equations of fluid and solid MCMs, have been developed for the research of magnetic refrigeration [ 2 , 10 , 11 , 12 , 13 , 14 , 15 , 25 , 26 ], and Nielsen et al have made a review on the AMR modeling [ 27 ]. In these models the magnetic refrigeration fundamental was studied [ 10 , 12 ] and the effects of structural and operational parameters on performance aspects, such as temperature span, refrigeration capacity, and Coefficient of Performance (COP), were studied for optimization [ 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates

You

Yang

et al. 2018

Entropy

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In the current work, a novel 2D numerical model of stationary grids was developed for reciprocating magnetic refrigerators, with Gd plates, in which the magneto-caloric properties, derived from the Weiss molecular field theory, were adopted for the built-in energy source of the magneto-caloric effect. The numerical simulation was conducted under the conditions of different structural and operational parameters, and the effects of the relative fluid displacement (φ) on the specific refrigeration capacity (qref) and the Coefficient of Performance (COP) were obtained. Besides the variations of entropy, the generation rate and number were studied and the contours of the local entropy generation rate are presented for discussion. From the current work, it is found that with an increase in φ, both the qref and COP followed the convex variation trend, while the entropy generation number (Ns) varied concavely. As for the current cases, the maximal qref and COP were equal to 151.2 kW/m 3 and 9.11, respectively, while the lowest Ns was the value of 2.4 × 10 −4 K −1 . However, the optimal φ for the largest qref and COP, and for the lowest Ns, were inconsistent, thus, some compromises need be made in the optimization of magnetic refrigerators.

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Improving magnetic refrigerator performances by enhancing convection heat transfer with staggered twin-wedged elements

Cited by 8 publications

References 29 publications

Energy Applications of Magnetocaloric Materials

Energy Applications of Magnetocaloric Materials

Caloric devices: A review on numerical modeling and optimization strategies

Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates

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