Cooling by sweeping: A new operation method to achieve ferroic refrigeration without fluids or thermally switchable components

authors	Silva, DJ; Amaral, JS; Amaral, VS
nationality	International
journal	INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
author keywords	Solid state refrigeration; Ferroic refrigeration; Magnetocaloric effect; Magnetic field
keywords	CALORIC MATERIALS; DEVICE
abstract	So far, all ferroic-based refrigerator prototypes have relied either in fluids or thermally switchable components as main heat exchangers, which brings some issues in terms of their applicability, such as the use of pumps for moving the fluid and the availability of thermally switchable components. We show that such heat exchangers are not necessary if field dynamics are explored. By using the example of magnetocaloric refrigeration, we show numerically that the operation of a simple apparatus constituted only by a magnetocaloric material and a magnet sweeping at a given frequency results in refrigeration. With the optimization of the type of motion, resting times after the complete application and removal of the magnetic field and frequency, a temperature span of 0.87 K is reached, which represents similar to 20% of the maximum adiabatic temperature span of the material used in modeling, gadolinium. (C) 2019 Elsevier Ltd and IIR. All rights reserved.
publisher	ELSEVIER SCI LTD
issn	0140-7007
isbn	1879-2081
year published	2019
volume	101
beginning page	98
ending page	105
digital object identifier (doi)	10.1016/j.ijrefrig.2019.02.029
web of science category	Thermodynamics; Engineering, Mechanical
subject category	Thermodynamics; Engineering
unique article identifier	WOS:000470966500011