Abstract
| Original language | English |
|---|---|
| Journal | Applied Thermal Engineering |
| Volume | 128 |
| Pages (from-to) | 10-19 |
| ISSN | 1359-4311 |
| DOIs | |
| Publication status | Published - 2017 |
Keywords
- Magnetic refrigeration
- Active magnetic refrigerator
- Epoxy bonded regenerator
- Heat transfer
- Friction factor
Cite this
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Passive characterization and active testing of epoxy bonded regenerators for room temperature magnetic refrigeration. / Lei, Tian; Navickaité, Kristina; Engelbrecht, Kurt; Barcza, Alexander; Vieyra, Hugo ; Nielsen, Kaspar Kirstein; Bahl, Christian.
In: Applied Thermal Engineering, Vol. 128, 2017, p. 10-19.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Passive characterization and active testing of epoxy bonded regenerators for room temperature magnetic refrigeration
AU - Lei, Tian
AU - Navickaité, Kristina
AU - Engelbrecht, Kurt
AU - Barcza, Alexander
AU - Vieyra, Hugo
AU - Nielsen, Kaspar Kirstein
AU - Bahl, Christian
PY - 2017
Y1 - 2017
N2 - Epoxy bonded regenerators of both spherical and irregular La(Fe,Mn,Si)13Hy particles have been developed aiming at increasing the mechanical strength of active magnetic regenerators (AMR) loaded with brittle magnetocaloric materials and improving the flexibility of shaping the regenerator geometry. Although the magnetocaloric properties of these materials are well studied, the flow and heat transfer characteristics of the epoxy bonded regenerators have seldom been investigated. This paper presents a test apparatus that passively characterizes regenerators using a liquid heat transfer fluid with an oscillating flow at low Reynolds numbers, simulating the hydraulic working conditions in AMRs. Dimensionless parameters, including friction factor, effectiveness and overall Nusselt number, are presented for the epoxy bonded La(Fe,Mn,Si)13Hy regenerators and reference packed particle beds. Moreover, a five-layer AMR based on spherical particles is tested actively in a small reciprocating magnetic refrigerator, achieving a no-load temperature span of 16.8 °C using about 143 g of epoxy-bonded La(Fe,Mn,Si)13Hy materials. Simulations based on a one-dimensional (1D) AMR model are also implemented to validate and analyze the results from the active test.
AB - Epoxy bonded regenerators of both spherical and irregular La(Fe,Mn,Si)13Hy particles have been developed aiming at increasing the mechanical strength of active magnetic regenerators (AMR) loaded with brittle magnetocaloric materials and improving the flexibility of shaping the regenerator geometry. Although the magnetocaloric properties of these materials are well studied, the flow and heat transfer characteristics of the epoxy bonded regenerators have seldom been investigated. This paper presents a test apparatus that passively characterizes regenerators using a liquid heat transfer fluid with an oscillating flow at low Reynolds numbers, simulating the hydraulic working conditions in AMRs. Dimensionless parameters, including friction factor, effectiveness and overall Nusselt number, are presented for the epoxy bonded La(Fe,Mn,Si)13Hy regenerators and reference packed particle beds. Moreover, a five-layer AMR based on spherical particles is tested actively in a small reciprocating magnetic refrigerator, achieving a no-load temperature span of 16.8 °C using about 143 g of epoxy-bonded La(Fe,Mn,Si)13Hy materials. Simulations based on a one-dimensional (1D) AMR model are also implemented to validate and analyze the results from the active test.
KW - Magnetic refrigeration
KW - Active magnetic refrigerator
KW - Epoxy bonded regenerator
KW - Heat transfer
KW - Friction factor
U2 - 10.1016/j.applthermaleng.2017.08.152
DO - 10.1016/j.applthermaleng.2017.08.152
M3 - Journal article
VL - 128
SP - 10
EP - 19
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
SN - 1359-4311
ER -