Effects of hysteresis and Brayton cycle constraints on magnetocaloric refrigerant performance
Effects of hysteresis and Brayton cycle constraints on magnetocaloric refrigerant performance
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DOI：
10.1063/1.5022467
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发表时间：
2018-05-14
影响因子：
3.2
通讯作者：
Shamberger, P. J.
中科院分区：
文献类型：
--
作者：
Brown, T. D.;Buffington, T.;Shamberger, P. J.
尽管概念证明很有希望，但磁制冷的系统级实施仍受到历史相关制冷剂损失的严重限制，这些损失与控制热力循环相互作用，对制冷性能产生不利影响。未来的发展需要更详细地了解滞后如何限制性能，以及不同类型的周期如何减轻这些限制，但没有实验实现的极端成本。在这里，效用的布雷顿循环磁制冷的研究通过直接模拟，使用组合的磁-磁滞建模框架来计算模型合金的路径依赖的磁化强度和熵的各种可行的布雷顿循环之间的0-1.5 T和0-5 T。通过同时改变模型合金的滞后特性和应用扩展的热力学定律的非平衡系统，热传递和效率进行量化整个空间的Ericreses和布雷顿循环，然后与以前的调查使用爱立信循环。结果表明：（1）磁滞损耗仍然是磁制冷实现的关键障碍，在需要磁滞的模型系统中，效率>80%
Despite promising proofs of concept, system-level implementation of magnetic refrigeration has been critically limited by history-dependent refrigerant losses that interact with governing thermo-dynamic cycles to adversely impact refrigeration performance. Future development demands a more detailed understanding of how hysteresis limits performance, and of how different types of cycles can mitigate these limitations, but without the extreme cost of experimental realization. Here, the utility of Brayton cycles for magnetic refrigeration is investigated via direct simulation, using a combined thermodynamic-hysteresis modeling framework to compute the path-dependent magnetization and entropy of a model alloy for a variety of feasible Brayton cycles between 0-1.5 T and 0-5 T. By simultaneously varying the model alloy's hysteresis properties and applying extensions of the thermodynamic laws to non-equilibrium systems, heat transfers and efficiencies are quantified throughout the space of hystereses and Brayton cycles and then compared with a previous investigation using Ericsson cycles. It is found that (1) hysteresis losses remain a critical obstacle to magnetic refrigeration implementation, with efficiencies >80% in the model system requiring hysteresis