Passive characterization and active testing of epoxy bonded regenerators for room temperature magnetic refrigeration

Tian Lei, Kristina Navickaité, Kurt Engelbrecht, Alexander Barcza, Hugo Vieyra, Kaspar Kirstein Nielsen, Christian Bahl

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

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.
Original languageEnglish
JournalApplied Thermal Engineering
Volume128
Pages (from-to)10-19
ISSN1359-4311
DOIs
Publication statusPublished - 2017

Keywords

  • Magnetic refrigeration
  • Active magnetic refrigerator
  • Epoxy bonded regenerator
  • Heat transfer
  • Friction factor

Cite this

@article{cb2145a1666344858096bb95d7926592,
title = "Passive characterization and active testing of epoxy bonded regenerators for room temperature magnetic refrigeration",
abstract = "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.",
keywords = "Magnetic refrigeration, Active magnetic refrigerator, Epoxy bonded regenerator, Heat transfer, Friction factor",
author = "Tian Lei and Kristina Navickait{\'e} and Kurt Engelbrecht and Alexander Barcza and Hugo Vieyra and Nielsen, {Kaspar Kirstein} and Christian Bahl",
year = "2017",
doi = "10.1016/j.applthermaleng.2017.08.152",
language = "English",
volume = "128",
pages = "10--19",
journal = "Applied Thermal Engineering",
issn = "1359-4311",
publisher = "Pergamon Press",

}

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 journalJournal articleResearchpeer-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

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JO - Applied Thermal Engineering

JF - Applied Thermal Engineering

SN - 1359-4311

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