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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. 2 figs.
Inventors:
Issue Date:
OSTI Identifier:
6828131
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; EDB-94-166584
Patent Number(s):
US 5357756; A
Application Number:
PPN: US 8-125277
Contract Number:
AC05-84OR21400
Resource Relation:
Patent File Date: 23 Sep 1993
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; MAGNETIC REFRIGERATORS; DESIGN; CONTROL EQUIPMENT; HEAT EXCHANGERS; MAGNETIC FIELDS; PULSE TECHNIQUES; EQUIPMENT; REFRIGERATORS 320303* -- Energy Conservation, Consumption, & Utilization-- Industrial & Agricultural Processes-- Equipment & Processes; 320106 -- Energy Conservation, Consumption, & Utilization-- Building Equipment-- (1987-)