Environmental Engineering Reference
In-Depth Information
Table 7.35 Rotary magnetic prototype from Technical University of Denmark
Name and address of institute
Department of Energy Conversion and Storage,
Technical University of Denmark, Frederiksborgvej 399,
DK-4000 Roskilde, Denmark
Name of contact person/email
Christian Bahl/chrb@dtu.dk
Year of production
2010
Type
Rotary
Maximum frequency
10 Hz
Maximum cooling power
1012 W
Maximum temperature span
25.4 K
Type of AMR
Packed bed
MC material(s)
Gd (0.25
0.8 mm, 2,800 g)
-
Type of magnets
Modi ed Concentric double Halbach cylinder
The decrease in performance is mainly due to the friction in the AMR rotation and
the poorer heat transfer at higher operating frequencies.
In 2013 Lozano et al. [ 64 ] presented further performance studies on this pro-
totype [ 63 ]. They studied the influence of different parasitic losses (in lter, tubes,
fl
ow-head and regenerator) in relation to different temperatures at the cold side.
Furthermore, they also focused on the in
fl
uence of the hot reservoir temperature of
the hot side and the volumetric
ow rate. When operating at a frequency of 1.5 Hz,
a hot-side temperature of 297.7 K and a speci
fl
c cooling load of 142.8 W kg 1 , the
temperature span was 12.9 K with a Carnot ef
ciency of 5.6 %.
In 2014, additional studies on the performance of the described prototype were
presented by Lozano et al. [ 65 ]. They studied the impact of high operating fre-
quencies up to 10 Hz and volumetric
ow rates up to 600 l h 1 . The temperature of
fl
the hot side was
xed at 296 K. Operating at a frequency of 2 Hz the zero-
temperature span speci
c cooling power was 223.2 W kg 1 . When the speci
c
cooling load was decreased to 142.8 W kg 1 , the temperature span increased to
11.5 K. At 35.7 W kg 1 , the temperature span further increased to 18 K. When the
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