ECOLOGICAL MAGNETIC REFRIGERATORS

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ECOLOGICAL MAGNETIC REFRIGERATORS

Journal Title: Proceedings of Electrotechnical Institute Prace Instytutu Elektrotechniki - Year 2013, Vol 60, Issue 261

Abstract

The magnetocaloric effect (MCE) is a thermodynamic process in which the temperature changes of a paramagnetic material are the effect of an external magnetic field changing in cycles. The refrigeration occurs in two stages: the first one is the isothermal magnetizing of the material, during which the intensity of the magnetic field rises from [i]H[/i][sub]0[/sub] to [i]H[/i][sub]3[/sub] (Fig. 1 process 1-2); during the magnetizing the dipoles of the paramagnetic material become arranged parallely to the intensity of the external magnetic field and the entropy of the material decreases from [i]S[/i][sub]1[/sub] to [i]S[sub][/sub][/i][sub]2[/sub]. As a result of magnetizing, heat is transferred to the surroundings in a quantity proportional to the work executed by the magnetic field. The second stage is the adiabatic demagnetization of the paramagnetic material to the value of the field intensity of [i]H[/i][sub]0[/sub], during which there occures a decrease in temperature of the material from [i]T[/i][sub]p[/sub] to [i]T[/i][sub]12[/sub] (Fig. 2 process 2-3).<br/><br/>

Authors and Affiliations

Renata Sulima

Keywords

chłodzenie magnetyczne materiały magnetokaloryczne magnesy trwałe analiza polowa 2D i 3D magnetic refrigeration magnetocaloric material adiabatic demagnetization permanent magnets 2D and 3D field analysis

EP ID EP68391
DOI -
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