Journal
INTERNATIONAL JOURNAL OF REFRIGERATION
Volume 72, Issue -, Pages 192-205Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2016.07.009
Keywords
Active magnetic regenerator; Magnetic refrigeration; Thermodynamic performance; Experimental apparatus
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Funding
- Embraco
- CNPq [573581/2008-8]
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In this first part of a two-part paper, a new active magnetic regenerator (AMR) laboratory apparatus is presented and evaluated. The setup is composed of a nested Halbach cylinder magnetic circuit (maximum magnetic flux density of 1.69 T) assembled in phase with a double effect displacer that provides the cold and hot blows to the regenerator. A single packed-bed regenerator with 195.5 g of gadolinium spheres is used in a discontinuous (i.e., reciprocating) cycle. The system performance is evaluated in terms of characteristic curves (i.e., cooling capacity as a function of temperature span), coefficient of performance and second-law efficiency as a function of the utilization factor and operating frequency. Maximum values of COP have been identified for a given temperature span. The maximum values of second-law efficiency were obtained at system temperature spans between 15 and 20 K. (C) 2016 Elsevier Ltd and IIR. All rights reserved.
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