Heat transfer figures of merit for mapping passive regenerator performance to active regenerator cooling power

Jierong Liang; Kaspar Kirstein Nielsen; Kurt Engelbrecht; Christian  Bahl

doi:10.1016/j.applthermaleng.2020.115993

Heat transfer figures of merit for mapping passive regenerator performance to active regenerator cooling power

Jierong Liang^*, Kaspar Kirstein Nielsen, Kurt Engelbrecht, Christian Bahl

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

This study reports specific heat transfer figures of merit for thermal regenerators and applications using the passive characterization, which can rapidly predict the cooling capacity of active magnetic regenerators (AMRs) in magnetic refrigeration. We expand the expression for the thermal effectiveness in terms of the individual contributions of heat storage and parasitic losses, using one-dimensional energy equations and mathematical estimations. Furthermore, a quantitative expression correlating the heat transfer effectiveness and cooling capacity provides a metric for the characterization of AMRs having new porous geometries. We found that the solid heat storage term of the effectiveness has a clearer impact on both the conjugate heat transfer and cooling capacity of AMRs than the entire effectiveness does.

Original language	English
Article number	115993
Journal	Applied Thermal Engineering
Volume	181
Number of pages	13
ISSN	1359-4311
DOIs	https://doi.org/10.1016/j.applthermaleng.2020.115993
Publication status	Published - 2020

Keywords

Active magnetic regenerator
Figure of merit
ε-NTU
Oscillatory flow
Porous media
Heat transfer

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@article{c035fa52cba442f99356ef17cf91b084,

title = "Heat transfer figures of merit for mapping passive regenerator performance to active regenerator cooling power",

abstract = "This study reports specific heat transfer figures of merit for thermal regenerators and applications using the passive characterization, which can rapidly predict the cooling capacity of active magnetic regenerators (AMRs) in magnetic refrigeration. We expand the expression for the thermal effectiveness in terms of the individual contributions of heat storage and parasitic losses, using one-dimensional energy equations and mathematical estimations. Furthermore, a quantitative expression correlating the heat transfer effectiveness and cooling capacity provides a metric for the characterization of AMRs having new porous geometries. We found that the solid heat storage term of the effectiveness has a clearer impact on both the conjugate heat transfer and cooling capacity of AMRs than the entire effectiveness does.",

keywords = "Active magnetic regenerator, Figure of merit, ε-NTU, Oscillatory flow, Porous media, Heat transfer",

author = "Jierong Liang and Nielsen, {Kaspar Kirstein} and Kurt Engelbrecht and Christian Bahl",

year = "2020",

doi = "10.1016/j.applthermaleng.2020.115993",

language = "English",

volume = "181",

journal = "Applied Thermal Engineering",

issn = "1359-4311",

publisher = "Pergamon Press",

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TY - JOUR

T1 - Heat transfer figures of merit for mapping passive regenerator performance to active regenerator cooling power

AU - Liang, Jierong

AU - Nielsen, Kaspar Kirstein

AU - Engelbrecht, Kurt

AU - Bahl, Christian

PY - 2020

Y1 - 2020

N2 - This study reports specific heat transfer figures of merit for thermal regenerators and applications using the passive characterization, which can rapidly predict the cooling capacity of active magnetic regenerators (AMRs) in magnetic refrigeration. We expand the expression for the thermal effectiveness in terms of the individual contributions of heat storage and parasitic losses, using one-dimensional energy equations and mathematical estimations. Furthermore, a quantitative expression correlating the heat transfer effectiveness and cooling capacity provides a metric for the characterization of AMRs having new porous geometries. We found that the solid heat storage term of the effectiveness has a clearer impact on both the conjugate heat transfer and cooling capacity of AMRs than the entire effectiveness does.

AB - This study reports specific heat transfer figures of merit for thermal regenerators and applications using the passive characterization, which can rapidly predict the cooling capacity of active magnetic regenerators (AMRs) in magnetic refrigeration. We expand the expression for the thermal effectiveness in terms of the individual contributions of heat storage and parasitic losses, using one-dimensional energy equations and mathematical estimations. Furthermore, a quantitative expression correlating the heat transfer effectiveness and cooling capacity provides a metric for the characterization of AMRs having new porous geometries. We found that the solid heat storage term of the effectiveness has a clearer impact on both the conjugate heat transfer and cooling capacity of AMRs than the entire effectiveness does.

KW - Active magnetic regenerator

KW - Figure of merit

KW - ε-NTU

KW - Oscillatory flow

KW - Porous media

KW - Heat transfer

U2 - 10.1016/j.applthermaleng.2020.115993

DO - 10.1016/j.applthermaleng.2020.115993

M3 - Journal article

VL - 181

JO - Applied Thermal Engineering

JF - Applied Thermal Engineering

SN - 1359-4311

M1 - 115993

ER -