resumo
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.
palavras-chave
CALORIC MATERIALS; DEVICE
categoria
Thermodynamics; Engineering
autores
Silva, DJ; Amaral, JS; Amaral, VS
nossos autores
Daniel José da Silva
Bolseiro de pós-Doutoramento
João Cunha de Sequeira Amaral
Investigador Auxiliar
Vitor Brás Sequeira Amaral
Professor CatedráticoProjectos
SGH : Smart Green Homes (Smart Green Homes)
Projeto de Investigação Exploratória: João Amaral (IF/01089/2015)
agradecimentos
The present study was developed in the scope of the Smart Green Homes Project [POCI-01-0247-FEDER-007678], a copromotion between Bosch Termotecnologia S. A. and the University of Aveiro. It is financed by Portugal 2020 under the Competitiveness and Internationalization Operational Program, and by the European Regional Development Fund. Project CICECOAveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CT/5001/2013), financed by national funds through the FCT/MEC and co-financed by FEDER under the PT2020 Partnership Agreement is acknowledged. JSA acknowledges FCT IF/01089/2015 research grant.