期刊
CRYOGENICS
卷 93, 期 -, 页码 34-40出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cryogenics.2018.05.010
关键词
Magnetocaloric effect; Active magnetic regenerator; Gadolinium; Liquefaction; Bypass flow
资金
- Fuel Cell Technology Office of the Energy Efficiency and Renewable Energy Office of the Department of Energy
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 imbalance 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. In the present work, the net cooling power of an active magnetic regenerative liquefier is investigated as a function of the bypass flow fraction. Experiments are performed at a fixed temperature span yielding a 30% improvement in net cooling power, affirming the potential of bypass flow in active magnetic regenerative liquefiers.
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