Investigation of bypass fluid flow in an active magnetic regenerative liquefier
Investigation of bypass fluid flow in an active magnetic regenerative liquefier
复制标题
主动磁再生液化器旁路流体流动研究
DOI：
10.1016/j.cryogenics.2018.05.010
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发表时间：
2018
期刊：
影响因子：
2.1
通讯作者：
J. Barclay
中科院分区：
文献类型：
--
作者：
Jamelyn D. Holladay;R. Teyber;Kerry D. Meinhardt;Evgueni Polikarpov;E. Thomsen;Corey Archipley;J. Cui;J. Barclay
在居里温度以下工作的二阶磁热材料的有源磁蓄热器具有磁化比热低于退磁比热的独特特性。相关的热质量不平衡允许冷热交换器中的一小部分传热流体绕过磁化再生器。这种旁路冷流体可以在工艺流返回热侧时对其进行预冷却，从而提高液化效率并降低液冷剂的成本。虽然研究人员已经意识到这一现象几十年了，但旁路流体流动的实验性能改进尚未在公开文献中报道。本文研究了主动磁再生液化器的净冷却功率随旁通流分数的变化规律。实验在固定温度范围内进行，净冷却功率提高25%，肯定了旁路冷却功率的潜力。
Active magnetic regenerators (AMR) with second order magnetocaloric materials operating below the Curie temperature have a unique property where the magnetized specific heat is lower than the demagnetized specific heat. The associated thermal mass unbalance allows a fraction of heat transfer fluid in the cold heat exchanger to bypass the magnetized regenerator. This cold bypassed fluid can precool a process stream as it returns to the hot side, thereby increasing the efficiency of liquefaction and reducing the cost of liquid cryogens. While researchers have been aware of this phenomenon for decades, experimental performance improvements from bypass fluid flow have yet to be reported in open literature. In the present work, the net cooling power of an active magnetic regenerative liquefier is investigated as a function of the bypass ow fraction. Experiments are performed at a fixed temperature span that yield a 25% improvement in net cooling power, affirming the potential of bypass cooling power.