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Investigation of bypass fluid flow in an active magnetic regenerative liquefier

TitleInvestigation of bypass fluid flow in an active magnetic regenerative liquefier
Publication TypeJournal Article
Year of Publication2018
AuthorsHolladay, J, Teyber, R, Meinhardt, K, Polikarpov, E, Thomsen, E, Archipley, C, Cui, J, Barclay, J
JournalCryogenics
Volume93
Pagination34-40
Date Published07
Type of ArticleArticle
ISBN Number0011-2275
Accession NumberWOS:000439400900005
Keywordsactive magnetic regenerator, Bypass flow, gadolinium, hydrogen liquefaction, Liquefaction, Magnetocaloric effect, physics, refrigerator, Thermodynamics
Abstract

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.

DOI10.1016/j.cryogenics.2018.05.010
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Short TitleCryogenics
Alternate JournalCryogenics