Simulation of an operation of nested Halbach cylinder arrays in regenerative magnetic cooling cycles: The way to maximum thermal span

IF 3.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-05 DOI:10.1016/j.ijrefrig.2024.09.001
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Abstract

In this study, a numerical model of the Active Magnetic Regenerator (AMR) cycle, implemented in the reciprocal demonstrator, was developed using COMSOL Multiphysics. A nested Halbach cylinder (NHC) array served as the magnetic field source. Additional simulation of an operation of the NHC array was carried out. To eliminate the discrepancies between the heat exchange duration of the heat transfer medium (HTM) and the hot and cold ends of the regenerator, an adequate time dependence of the inner cylinder rotation angle was calculated. The latter provides the symmetrical sinusoidal form of time dependence of the magnetic flux density in the gap of NHC array, which is important for enhancing the performance of a magnetic refrigerator. It was established that in order to achieve a maximal temperature span, it is necessary to shift the phases of the magnetic field insertion/removal and heat transfer fluid pumping processes by nearly half of the operating cycle period. The latter brings the simulated cycle closer to the ideal AMR cycle.

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模拟嵌套式哈尔巴赫圆筒阵列在再生磁冷却循环中的运行:实现最大热跨度的途径
在本研究中,使用 COMSOL Multiphysics 开发了主动磁再生器 (AMR) 循环的数值模型,该模型在往复式演示器中实施。一个嵌套的哈尔巴赫圆柱体(NHC)阵列作为磁场源。此外,还对 NHC 阵列的运行进行了模拟。为了消除传热介质 (HTM) 和再生器冷热端热交换持续时间之间的差异,计算了内圆筒旋转角的充分时间依赖性。后者提供了 NHC 阵列间隙中磁通密度的对称正弦时间依赖形式,这对提高磁制冷器的性能非常重要。结果表明,为了实现最大的温度跨度,有必要将磁场插入/移除和导热液体泵送过程的相位移动近一半的运行周期。后者使模拟周期更接近理想的 AMR 周期。
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来源期刊
CiteScore
7.30
自引率
12.80%
发文量
363
审稿时长
3.7 months
期刊介绍: The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.
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