Experimental Study of Active Magnetic Regenerator (AMR) Composed of Spherical GdN
Files
Author(s)
Hirayama, Y.
Okada, H.
Nakagawa, T.
Yamamoto, T. A.
Kusunose, T.
Numazawa, T.
Mastumoto, K.
Irie, T.
Nakamura, E.
Advisor(s)
Editor(s)
Collections
Supplementary to:
Permanent Link
Abstract
An experimental study of an active magnetic regenerator (AMR) employing GdN was carried
out. Spherical GdN material was synthesized by the hot isostatic pressing (HIP) method. The specific
heat was measured and the magnetic entropy change ΔS and adiabatic temperature change
ΔTad were calculated. The refrigeration with an AMR cycle was tested in the temperature range
between 48 and 66 K with the field swinging from 1.2 to 3.7 T at upper side and from 2.0 to 4.0 T
at lower side of the regenerator bed filled with GdN spheres. A temperature span, ΔTspan,was found
to develop soon after starting the cycle and became more than 4.7 degree in steady state. This
temperature span ΔTspan was at least 1.5 times as large as the adiabatic temperature change ΔTad.
Sponsor
Date
2008-05
Extent
Resource Type
Text
Resource Subtype
Proceedings