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Title: Characterization of Bypass Fluid Flow in an Active Magnetic Regenerative Liqueer

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 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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. BATTELLE (PACIFIC NW LAB)
  2. Iowa State University
  3. MULTIPLE CONTRACTORS
  4. Emerald Energy NW, LLC
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1509859
Report Number(s):
PNNL-SA-130481
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
International Journal of Refrigeration
Additional Journal Information:
Journal Name: International Journal of Refrigeration
Country of Publication:
United States
Language:
English
Subject:
active magnetic regenerator, hydrogen, liquefacation, magnetocaloric effect

Citation Formats

Holladay, Jamelyn D., Meinhardt, Kerry D., Polikarpov, Evgueni, Thomsen, Edwin C., Teyber, Reed P., Cui, Jun, Barclay, John A., and Archipley, Corey. Characterization of Bypass Fluid Flow in an Active Magnetic Regenerative Liqueer. United States: N. p., 2018. Web. doi:10.1016/j.cryogenics.2018.05.010.
Holladay, Jamelyn D., Meinhardt, Kerry D., Polikarpov, Evgueni, Thomsen, Edwin C., Teyber, Reed P., Cui, Jun, Barclay, John A., & Archipley, Corey. Characterization of Bypass Fluid Flow in an Active Magnetic Regenerative Liqueer. United States. doi:10.1016/j.cryogenics.2018.05.010.
Holladay, Jamelyn D., Meinhardt, Kerry D., Polikarpov, Evgueni, Thomsen, Edwin C., Teyber, Reed P., Cui, Jun, Barclay, John A., and Archipley, Corey. Sun . "Characterization of Bypass Fluid Flow in an Active Magnetic Regenerative Liqueer". United States. doi:10.1016/j.cryogenics.2018.05.010.
@article{osti_1509859,
title = {Characterization of Bypass Fluid Flow in an Active Magnetic Regenerative Liqueer},
author = {Holladay, Jamelyn D. and Meinhardt, Kerry D. and Polikarpov, Evgueni and Thomsen, Edwin C. and Teyber, Reed P. and Cui, Jun and Barclay, John A. and Archipley, Corey},
abstractNote = {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.},
doi = {10.1016/j.cryogenics.2018.05.010},
journal = {International Journal of Refrigeration},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {7}
}