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Optimization of Multi-layer Active Magnetic Regenerator towards Compact and Efficient Refrigeration

机译:多层式主动磁再生器在小型高效制冷中的优化

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摘要

Magnetic refrigerators can theoretically be more efficient than current vapor compression systems and use no vapor refrigerants with global warming potential. The core component, the active magnetic regenerator (AMR) operates based on the magnetocaloric effect of magnetic materials and the heat regeneration processes of periodic fluid blows. Magnetocaloric materials with a first order phase transition (FOPT) are suitable to realize a higher cooling capacity than commonly used gadolinium, but layering such materials is necessary, due to a large isothermal entropy change (Δ푆) in a narrow region around their Curie temperature. Simulations are implemented to investigate how to layer the FOPT materials for obtaining higher cooling capacity. Moreover, based on entropy generation minimization, optimization of the regenerator geometry and related operating parameters is presented for improving the AMR efficiency. In addition, simulations are carried out to investigate the potential of applying nanofluid in future magnetic refrigerators.
机译:从理论上讲,电磁冰箱比目前的蒸汽压缩系统更高效,并且不使用具有全球变暖潜能的蒸汽制冷剂。核心部件,即主动磁再生器(AMR),是基于磁性材料的磁热效应和周期性流体吹动的热再生过程而运行的。具有一阶相变(FOPT)的磁热材料适合于实现比通常使用的higher更高的冷却能力,但是由于在其居里温度附近的狭窄区域中存在较大的等温熵变(Δ푆),因此需要对此类材料进行分层。进行仿真以研究如何对FOPT材料进行分层以获得更高的冷却能力。此外,基于最小化熵产生,提出了再生器几何形状和相关操作参数的优化以提高AMR效率。另外,进行了模拟以研究在未来的磁性冰箱中应用纳米流体的潜力。

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