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Title: Active magnetic regenerative cooling with smaller magnets

Journal Article · · International Journal of Refrigeration
 [1];  [1];  [1];  [1]
  1. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
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Magnetocaloric heat pumping near room temperature, a.k.a. magnetic cooling, relies on the active regenerator cycle to achieve functional temperature spans and realize economic and societal benefits promised by this emerging solid-state cooling technology. The cycle itself depends upon synchronizing oscillating flow of a heat transfer fluid through a solid porous active material matrix, or the refrigerant, with periods when the refrigerant is in the highest available (field-on) and in nearly zero (field-off) magnetic fields to accomplish heat transfer. With this in mind, in this work we analyze varying flow and magnetic field wave forms and the timing between when the fluid is pumped and when the magnetic field is turned on and off. We demonstrate that the volume and the cost of permanent magnet generating the field changes can be cut nearly in half with little to no effect on the device temperature span and cooling power normalized by the refrigerant mass.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1765705
Report Number(s):
IS--J-10,416; IS-J--10,510
Journal Information:
International Journal of Refrigeration, Journal Name: International Journal of Refrigeration Vol. 125; ISSN 0140-7007
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (12)

Numerical analysis of the influence of magnetic field waveforms on the performance of active magnetic regenerators journal June 2020
Effect of fluid dispersion coefficients on particle-to-fluid heat transfer coefficients in packed beds journal January 1979
Trade-offs in refrigerant selections: past, present, and future journal June 1998
Potential for cost effective magnetocaloric air conditioning systems journal December 2006
The next generation of refrigerants – Historical review, considerations, and outlook journal November 2008
The influence of the magnetic field on the performance of an active magnetic regenerator (AMR) journal January 2011
Experimental performance investigation of an active magnetic regenerator subject to different fluid flow waveforms journal February 2017
Experimental investigation of different fluid flow profiles in a rotary multi-bed active magnetic regenerator device journal July 2018
Influence of the flow rate waveform and mass imbalance on the performance of active magnetic regenerators. Part I: Experimental analysis journal September 2018
Magnetocaloric effect in some magnetic materials in alternating magnetic fields up to 22 Hz journal August 2016
A Thermodynamic Treatment of Certain Magnetic Effects. a Proposed Method of Producing Temperatures Considerably Below 1° Absolute journal August 1927
The Effect of Internal Temperature Gradients on Regenerator Matrix Performance journal March 2006

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Related Subjects

36 MATERIALS SCIENCE
Active magnetic regeneration
Magnetocaloric materials
Magnetocaloric systems
Permanent-magnet arrays
Second-law efficiency