The design and development of a magnetic refrigerator
A new tvpe ot macnetic retricerator usine a rotatine
belt eeometrv has been desiened and developed. The
retricerator u.e. the maenetocaloric ettect. that is. the
heat inc or cooline ot a maenetic material on application
or removal ot a maen.tic tield. to execute a Carnot cvcle.
An antiterromaanetic material. Gadolinium Gallium Garnet,
Gd3Gas012 (GGG) , i. used ae the retricerant. This is in
the torm ot a belt which run. throuch the bore ot a
.uperconduct1na solenoid macnet to execute the cyole.
The retricerator has been developed in three staces,
Fir.tlv the belt ceometry was de.icned. oonstructed and
te.ted. This lead to the development ot the model one
retricerator. and ba.ed on the.e results the model two
retriaerator was con.tructed.
Re.ult •• trom the model two retricerator. show an
anomalous temperature increa.e in the .ource recion
resul tine trom a re - lIlaenetieation ot the belt.
Purthermore. entrained tluid ettects limit the operatinc
temperature span. However. the belt concept has been
.ucce.etullv realised with it beina operated at
trequencie. ot up to 30 rpm in macnetic tields not