Study of geometries of active magnetic regenerators for room temperature magnetocaloric refrigeration

Tian Lei, Kurt Engelbrecht, Kaspar Kirstein Nielsen, Christian T. Veje

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Room temperature magnetic refrigeration has attracted substantial attention during the past decades and continuing to increase the performance of active magnetic regenerators (AMR) is of great interest. Optimizing the regenerator geometry and related operating parameters is a practical and effective way to obtain the desired cooling performance. To investigate how to choose and optimize the AMR geometry, a quantitative study is presented by simulations based on a one-dimensional (1D) numerical model. Correlations for calculating the friction factor and heat transfer coefficient are reviewed and chosen for modeling different geometries. Moreover, the simulated impacts of various parameters on the regenerator efficiency with a constant specific cooling capacity are presented. An analysis based on entropy production minimization reveals how those parameters affect the main losses occurring inside the AMR. In addition, optimum geometry and operating parameters corresponding to the highest efficiency for different geometries are presented and compared. The results show that parallel plate and micro-channel matrices show the highest theoretical efficiency, while the packed screen and packed sphere beds are possibly more practical from the application point of view.
Original languageEnglish
JournalApplied Thermal Engineering
Volume111
Pages (from-to)1232–1243
Number of pages12
ISSN1359-4311
DOIs
Publication statusPublished - 2017

Keywords

  • Active magnetic regenerator
  • Heat transfer
  • Magnetic refrigeration
  • Regenerator geometry

Cite this

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title = "Study of geometries of active magnetic regenerators for room temperature magnetocaloric refrigeration",
abstract = "Room temperature magnetic refrigeration has attracted substantial attention during the past decades and continuing to increase the performance of active magnetic regenerators (AMR) is of great interest. Optimizing the regenerator geometry and related operating parameters is a practical and effective way to obtain the desired cooling performance. To investigate how to choose and optimize the AMR geometry, a quantitative study is presented by simulations based on a one-dimensional (1D) numerical model. Correlations for calculating the friction factor and heat transfer coefficient are reviewed and chosen for modeling different geometries. Moreover, the simulated impacts of various parameters on the regenerator efficiency with a constant specific cooling capacity are presented. An analysis based on entropy production minimization reveals how those parameters affect the main losses occurring inside the AMR. In addition, optimum geometry and operating parameters corresponding to the highest efficiency for different geometries are presented and compared. The results show that parallel plate and micro-channel matrices show the highest theoretical efficiency, while the packed screen and packed sphere beds are possibly more practical from the application point of view.",
keywords = "Active magnetic regenerator, Heat transfer, Magnetic refrigeration, Regenerator geometry",
author = "Tian Lei and Kurt Engelbrecht and Nielsen, {Kaspar Kirstein} and Veje, {Christian T.}",
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language = "English",
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Study of geometries of active magnetic regenerators for room temperature magnetocaloric refrigeration. / Lei, Tian; Engelbrecht, Kurt; Nielsen, Kaspar Kirstein; Veje, Christian T.

In: Applied Thermal Engineering, Vol. 111, 2017, p. 1232–1243.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Study of geometries of active magnetic regenerators for room temperature magnetocaloric refrigeration

AU - Lei, Tian

AU - Engelbrecht, Kurt

AU - Nielsen, Kaspar Kirstein

AU - Veje, Christian T.

PY - 2017

Y1 - 2017

N2 - Room temperature magnetic refrigeration has attracted substantial attention during the past decades and continuing to increase the performance of active magnetic regenerators (AMR) is of great interest. Optimizing the regenerator geometry and related operating parameters is a practical and effective way to obtain the desired cooling performance. To investigate how to choose and optimize the AMR geometry, a quantitative study is presented by simulations based on a one-dimensional (1D) numerical model. Correlations for calculating the friction factor and heat transfer coefficient are reviewed and chosen for modeling different geometries. Moreover, the simulated impacts of various parameters on the regenerator efficiency with a constant specific cooling capacity are presented. An analysis based on entropy production minimization reveals how those parameters affect the main losses occurring inside the AMR. In addition, optimum geometry and operating parameters corresponding to the highest efficiency for different geometries are presented and compared. The results show that parallel plate and micro-channel matrices show the highest theoretical efficiency, while the packed screen and packed sphere beds are possibly more practical from the application point of view.

AB - Room temperature magnetic refrigeration has attracted substantial attention during the past decades and continuing to increase the performance of active magnetic regenerators (AMR) is of great interest. Optimizing the regenerator geometry and related operating parameters is a practical and effective way to obtain the desired cooling performance. To investigate how to choose and optimize the AMR geometry, a quantitative study is presented by simulations based on a one-dimensional (1D) numerical model. Correlations for calculating the friction factor and heat transfer coefficient are reviewed and chosen for modeling different geometries. Moreover, the simulated impacts of various parameters on the regenerator efficiency with a constant specific cooling capacity are presented. An analysis based on entropy production minimization reveals how those parameters affect the main losses occurring inside the AMR. In addition, optimum geometry and operating parameters corresponding to the highest efficiency for different geometries are presented and compared. The results show that parallel plate and micro-channel matrices show the highest theoretical efficiency, while the packed screen and packed sphere beds are possibly more practical from the application point of view.

KW - Active magnetic regenerator

KW - Heat transfer

KW - Magnetic refrigeration

KW - Regenerator geometry

U2 - 10.1016/j.applthermaleng.2015.11.113

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JF - Applied Thermal Engineering

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