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Dual stage active magnetic regenerator and method

United States Patent

5,887,449
March 30, 1999
View the Complete Patent at the US Patent & Trademark Office
Ames Laboratory - Visit the Iowa State University Research Foundation - Office of Intellectual Property & Technology Transfer Website
Regenerator for Magnetic Refrigerants
Regenerator for Magnetic Refrigerants
A dual stage active magnetic regenerator refrigerator as well as method using the Joule-Brayton thermodynamic cycle includes a high temperature stage refrigerant comprising DyAl.sub.2 or (Dy.sub.1-x Er.sub.x)Al.sub.2 where x is selected to be greater than 0 and less than about 0.3 in combination with a low temperature stage comprising (Dy.sub.1-x Er.sub.x)Al.sub.2 where x is selected to be greater than about 0.5 and less than 1 to provide significantly improved refrigeration efficiency in the liquefaction of gaseous hydrogen.
Pecharsky; Vitalij K. (Ames, IA), Gschneidner, Jr.; Karl A. (Ames, IA)
Iowa State University Research Foundation, Inc. (Ames, IA)
08/ 881,836
June 25, 1997
CONTRACTURAL ORIGIN OF INVENTION The United States Government has rights in this invention pursuant to Contract No. W-7405-ENG-82 between the U.S. Department of Energy and Iowa State University, Ames, Iowa, which contract grants to the Iowa State University Research Foundation, Inc. the right to apply for this patent.