Enhancing the temperature span of thermal switch-based solid state magnetic refrigerators with field sweeping
authors Silva, DJ; Ventura, J; Amaral, JS; Amaral, VS
nationality International
author keywords active magnetic regeneration; magnetic refrigeration; magnetocaloric effect
abstract Magnetocaloric refrigeration has been pointed out as the most promising alternative to the ubiquitous vapor-compression refrigeration technology due to its high coefficient of performance. Nevertheless, the use of hydraulic components in current devices is, among other reasons, hindering their commercial widespread. Solid state thermally switchable components are alternatives to the use of fluids. Since current developed structures are not ideal, the refrigerator operation design must be optimized to reduce their strict requirements. Active magnetic regeneration in fully solid state systems has been recently shown to be possible by moving the magnetic field gradually at constant speed, i.e., in several isochronal steps. Here, we investigate the implications of different operating modes on the temperature span, where the motion of the magnetic field includes acceleration and deceleration. When the magnetic field is either applied in a single step or from the cold to the hot reservoirs with linear or decelerated motion and is removed with acceleration motion from the hot to the cold reservoirs, the resulted temperature span increases up to 20%. The implications of each operating mode on the optimum frequency is discussed.
publisher WILEY
issn 0363-907X
isbn 1099-114X
year published 2019
volume 43
issue 2
beginning page 742
ending page 748
digital object identifier (doi) 10.1002/er.4264
web of science category Energy & Fuels; Nuclear Science & Technology
subject category Energy & Fuels; Nuclear Science & Technology
unique article identifier WOS:000459744200007
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journal analysis (jcr 2019):
journal impact factor 3.741
5 year journal impact factor 3.539
category normalized journal impact factor percentile 78.952
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