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Eddy current heating in magnetic refrigeratorsEddy current heating can be a significant source of parasitic heating in low temperature magnetic refrigerators. To study this problem a technique to approximate the heating due to eddy currents has been developed. A formula is presented for estimating the heating within a variety of shapes commonly found in magnetic refrigerators. These shapes include circular, square, and rectangular rods; cylindrical and split cylindrical shells; wire loops; and 'coil foil. One set of components evaluated are different types of thermal radiation shields. This comparison shows that a simple split shield is almost as effective (only 23 percent more heating) as using a shield, with the same axial thermal conductivity, made of 'coil foil'.
Document ID
19920030758
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kittel, Peter
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Engineering (General)
Meeting Information
Meeting: 1989 Cryogenic Engineering Conference
Location: Los Angeles, CA
Country: United States
Start Date: July 24, 1989
End Date: July 28, 1989
Accession Number
92A13382
Distribution Limits
Public
Copyright
Other

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