Modeling of magnetization and demagnetization in magnetic regenerative refrigeration

Author

Shir, Farhad ; Della Torre, Edward ; Bennett, Lawrence H. ; Mavriplis, Catherine ; Shull, Robert D.

Author_Institution

Inst. for Magnetics Res., George Washington Univ., Ashburn, VA, USA

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2098

Lastpage

2100

Abstract

A time-dependent model of temperature in magnetization and demagnetization processes is developed based on thermodynamic and heat transfer laws, material properties, and variable-field magnet parameters. Test results of a magnetic refrigeration test bed are compared with the model calculation. The model can be used to simulate optimum operating conditions and duty cycle of magnetic regenerative refrigeration. The effects of the thermal conductivity between the magnetocaloric material and the thermocouple on temperature measurements and thermal lag are presented.

Keywords

demagnetisation; heat transfer; magnetisation; magnetocaloric effects; refrigeration; thermal conductivity; thermocouples; thermodynamics; demagnetization modeling; heat transfer laws; magnetic regenerative refrigeration; magnetization modeling; magnetocaloric effect; magnetocaloric material; material properties; optimum operations simulation; temperature measurements; thermal conductivity; thermal lag; thermocouple; thermodynamic laws; time-dependent temperature model; variable-field magnet parameters; Demagnetization; Heat transfer; Magnetic materials; Magnetization; Material properties; Refrigeration; Temperature; Testing; Thermal conductivity; Thermodynamics; Magnetic refrigeration; magnetization model; magnetocaloric effect;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.832475

Filename

1325418