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Performance analysis of a high-efficiency multi-bed active magnetic regenerator device
ID
Masche, M.
(
Author
),
ID
Liang, Jierong
(
Author
),
ID
DallʹOlio, Stefano
(
Author
),
ID
Engelbrecht, Kurt
(
Author
),
ID
Bahl, Christian Robert Haffenden
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S1359431121009984
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Abstract
We present the performance of an active magnetic regenerator prototype with a multi-bed concept and parallel flow circuit. The prototype applies a two-pole permanent magnet (maximum magnetic flux density of 1.44 T) that rotates over 13 tapered regenerator beds mounted on a laminated iron yoke ring. Each bed is filled with about 262 g of spherical particles, distributed in layers of ten alloys of La(Fe,Mn,Si)13Hy (CALORIVAC HS) with different Curie temperatures. Other important features are the solenoid valves, the monitoring of the temperatures exiting each bed at the cold side, and a torque meter used to measure the magnetic power required to drive the cycle. The opening behavior of the solenoid valves (i.e., the blow fraction) could be adjusted to correct flow imbalances in each bed. The device provided a maximum cooling power of about 815 W at a cycle frequency of 1.2 Hz, a utilization of 0.36, and a hot reservoir temperature of 295 K while maintaining a 5.6 K-temperature span with a coefficient of performance of 6.0. In this case, the second-law efficiency was 11.6%. The maximum second-law efficiency of 20.5%, which represents one of the largest for a magnetocaloric device, was obtained at a cycle frequency of 0.5 Hz, a utilization of 0.34, and a hot reservoir temperature of 295 K at a temperature span of 10.3 K. Under these conditions, the device absorbed a cooling load of 288 W with a coefficient of performance of 5.7. It was also shown that an unbalanced flow due to different hydraulic resistance through the beds can cause cold side outlet temperature variations, which reduce the system performance, demonstrating the importance of a well-functioning, balanced flow system.
Language:
English
Keywords:
magnetocaloric effect
,
cooling performance
,
active magnetic regenerators
,
first-order phase transition
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2021
Number of pages:
12 str.
Numbering:
Vol. 199, art. 117569
PID:
20.500.12556/RUL-134663
UDC:
621.576
ISSN on article:
1359-4311
DOI:
10.1016/j.applthermaleng.2021.117569
COBISS.SI-ID:
94213635
Publication date in RUL:
25.01.2022
Views:
735
Downloads:
155
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Record is a part of a journal
Title:
Applied thermal engineering
Shortened title:
Appl. therm. eng.
Publisher:
Elsevier Science
ISSN:
1359-4311
COBISS.SI-ID:
1861910
Licences
License:
CC BY 4.0, Creative Commons Attribution 4.0 International
Link:
http://creativecommons.org/licenses/by/4.0/
Description:
This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:
20.09.2021
Applies to:
Available online
Secondary language
Language:
Slovenian
Keywords:
magnetno hlajenje
,
magnetni regeneratorji
,
magnetokalorično hlajenje
Projects
Funder:
EC - European Commission
Funding programme:
H2020
Project number:
814865
Name:
Renewables for clean energy buildings in a future power system
Acronym:
RES4BUILD
Funder:
Other - Other funder or multiple funders
Funding programme:
Innovation Fund Denmark
Project number:
12-132673
Acronym:
ENOVHEAT
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