Bipolar pulse field for magnetic refrigeration

Details Bipolar pulse field for magnetic refrigeration Bipolar pulse field for magnetic refrigeration

1993-09-23

1994-10-25

Capossela, Ronald C.

Refrigeration

Using electrical or magnetic effect

505891, F25B 2100

Patent

active

053577566

ABSTRACT:
A magnetic refrigeration apparatus includes first and second steady state magnets, each having a field of substantially equal strength and opposite polarity, first and second bodies made of magnetocaloric material disposed respectively in the influence of the fields of the first and second steady state magnets, and a pulsed magnet, concentric with the first and second steady state magnets, and having a field which cycles between the fields of the first and second steady state magnets, thereby cyclically magnetizing and demagnetizing and thus heating and cooling the first and second bodies. Heat exchange apparatus of suitable design can be used to expose a working fluid to the first and second bodies of magnetocaloric material. A controller is provided to synchronize the flow of working fluid with the changing states of magnetization of the first and second bodies.

REFERENCES:
patent: 4509334 (1985-04-01), Nakagome et al.
patent: 4916907 (1990-04-01), Munk et al.
patent: 5091361 (1992-02-01), Hed
patent: 5156003 (1992-10-01), Yoshiro et al.
patent: 5182914 (1993-02-01), Barclay et al.
patent: 5209068 (1993-05-01), Saji et al.

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