Experimental investigation of different fluid flow profiles in a rotary multi-bed active magnetic regenerator device

F. P. Fortkamp*, D. Eriksen, K. Engelbrecht, C. R. H. Bahl, J. A. Lozano, J. R. Barbose

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A rotary multi-bed active magnetic regenerator (AMR) device was modified to allow testing different fluid flow waveforms, with different blow fractions (i.e. the fraction of the AMR cycle when there is fluid flow in the regenerators). The different values of blow fraction were generated using different cam rings that actuate the poppet valves at the inlet and outlet of the regenerators, controlling how long the valves stay open and the number of valves open at the same time. Results showed that smaller blow fractions yield higher values of temperature span for fixed flow rate and cooling capacity, but lower values of coefficient of performance for the same conditions. An analysis of the shaft and pumping powers showed that shorter blow fractions cause higher pressure drop and higher torque oscillations and mechanical vibrations. The highest value of second-law efficiency of 19.1% was obtained for the largest blow fraction tested (80%). Designs for magnetic refrigerators where the fluid flow waveform can change during operation are also discussed in this paper.
Original languageEnglish
JournalInternational Journal of Refrigeration
Volume91
Pages (from-to)46-54
ISSN0140-7007
DOIs
Publication statusPublished - 2018

Keywords

  • Magnetic refrigeratio
  • Regeneratior
  • Experimentation
  • Efficiency

Cite this

@article{e9303d6b6be5439f9ce95fa04f51c6fd,
title = "Experimental investigation of different fluid flow profiles in a rotary multi-bed active magnetic regenerator device",
abstract = "A rotary multi-bed active magnetic regenerator (AMR) device was modified to allow testing different fluid flow waveforms, with different blow fractions (i.e. the fraction of the AMR cycle when there is fluid flow in the regenerators). The different values of blow fraction were generated using different cam rings that actuate the poppet valves at the inlet and outlet of the regenerators, controlling how long the valves stay open and the number of valves open at the same time. Results showed that smaller blow fractions yield higher values of temperature span for fixed flow rate and cooling capacity, but lower values of coefficient of performance for the same conditions. An analysis of the shaft and pumping powers showed that shorter blow fractions cause higher pressure drop and higher torque oscillations and mechanical vibrations. The highest value of second-law efficiency of 19.1{\%} was obtained for the largest blow fraction tested (80{\%}). Designs for magnetic refrigerators where the fluid flow waveform can change during operation are also discussed in this paper.",
keywords = "Magnetic refrigeratio, Regeneratior, Experimentation, Efficiency",
author = "Fortkamp, {F. P.} and D. Eriksen and K. Engelbrecht and Bahl, {C. R. H.} and Lozano, {J. A.} and Barbose, {J. R.}",
year = "2018",
doi = "10.1016/j.ijrefrig.2018.04.019",
language = "English",
volume = "91",
pages = "46--54",
journal = "International Journal of Refrigeration",
issn = "0140-7007",
publisher = "Elsevier",

}

Experimental investigation of different fluid flow profiles in a rotary multi-bed active magnetic regenerator device. / Fortkamp, F. P.; Eriksen, D.; Engelbrecht, K.; Bahl, C. R. H.; Lozano, J. A.; Barbose, J. R.

In: International Journal of Refrigeration, Vol. 91, 2018, p. 46-54.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Experimental investigation of different fluid flow profiles in a rotary multi-bed active magnetic regenerator device

AU - Fortkamp, F. P.

AU - Eriksen, D.

AU - Engelbrecht, K.

AU - Bahl, C. R. H.

AU - Lozano, J. A.

AU - Barbose, J. R.

PY - 2018

Y1 - 2018

N2 - A rotary multi-bed active magnetic regenerator (AMR) device was modified to allow testing different fluid flow waveforms, with different blow fractions (i.e. the fraction of the AMR cycle when there is fluid flow in the regenerators). The different values of blow fraction were generated using different cam rings that actuate the poppet valves at the inlet and outlet of the regenerators, controlling how long the valves stay open and the number of valves open at the same time. Results showed that smaller blow fractions yield higher values of temperature span for fixed flow rate and cooling capacity, but lower values of coefficient of performance for the same conditions. An analysis of the shaft and pumping powers showed that shorter blow fractions cause higher pressure drop and higher torque oscillations and mechanical vibrations. The highest value of second-law efficiency of 19.1% was obtained for the largest blow fraction tested (80%). Designs for magnetic refrigerators where the fluid flow waveform can change during operation are also discussed in this paper.

AB - A rotary multi-bed active magnetic regenerator (AMR) device was modified to allow testing different fluid flow waveforms, with different blow fractions (i.e. the fraction of the AMR cycle when there is fluid flow in the regenerators). The different values of blow fraction were generated using different cam rings that actuate the poppet valves at the inlet and outlet of the regenerators, controlling how long the valves stay open and the number of valves open at the same time. Results showed that smaller blow fractions yield higher values of temperature span for fixed flow rate and cooling capacity, but lower values of coefficient of performance for the same conditions. An analysis of the shaft and pumping powers showed that shorter blow fractions cause higher pressure drop and higher torque oscillations and mechanical vibrations. The highest value of second-law efficiency of 19.1% was obtained for the largest blow fraction tested (80%). Designs for magnetic refrigerators where the fluid flow waveform can change during operation are also discussed in this paper.

KW - Magnetic refrigeratio

KW - Regeneratior

KW - Experimentation

KW - Efficiency

U2 - 10.1016/j.ijrefrig.2018.04.019

DO - 10.1016/j.ijrefrig.2018.04.019

M3 - Journal article

VL - 91

SP - 46

EP - 54

JO - International Journal of Refrigeration

JF - International Journal of Refrigeration

SN - 0140-7007

ER -