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Title: Bipolar pulse field for magnetic refrigeration

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.
  1. (Oak Ridge, TN)
Issue Date:
OSTI Identifier:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5357756
Contract Number:
Research Org:
Country of Publication:
United States
bipolar; pulse; field; magnetic; refrigeration; apparatus; steady; magnets; substantially; equal; strength; opposite; polarity; bodies; magnetocaloric; material; disposed; respectively; influence; fields; pulsed; magnet; concentric; cycles; cyclically; magnetizing; demagnetizing; heating; cooling; heat; exchange; suitable; design; expose; fluid; controller; provided; synchronize; flow; changing; magnetization; magnetic refrigeration; bipolar pulse; opposite polarity; heat exchange; material disposed; substantially equal; refrigeration apparatus; pulse field; equal strength; pulsed magnet; /62/505/