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Optimisation of a packed particle magnetocaloric refrigerator: A combined experimental and theoretical study.

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Title: Optimisation of a packed particle magnetocaloric refrigerator: A combined experimental and theoretical study.
Authors: Adapa, Sarath R.1 (AUTHOR), Feng, Tianshi1 (AUTHOR), Ihnfeldt, Robin V.1,2 (AUTHOR) rihnfeldt@geandr.com, Chen, Renkun1,3 (AUTHOR) rkchen@ucsd.edu
Source: International Journal of Refrigeration. Mar2024, Vol. 159, p64-73. 10p.
Subjects: Heat transfer fluids, Helium, Biomass liquefaction, Thermal diffusivity, Refrigerators
Abstract: • Room-temperature magnetocaloric refrigeration prototype with helium as the heat transfer fluid and packed particle Gd 0.8875 Ce 0.1025 Si 0.84 Cr 0.19 as the refrigerant. • Measurements on temperature spans and cooling power with three particle sizes at two different operating cycles. • Reduction of performance in large particles from insufficient thermal diffusion in faster cycle. • Validated numerical model and compared effects of viscous dissipation and thermal diffusion. • Implications of magnetocaloric refrigerant with low thermal diffusivity for cryogenic temperatures discussed. Magnetocaloric refrigeration has strong potential towards achieving high efficiency hydrogen liquefaction. Optimising parameters such as particle size and operating cycles can have a significant impact on liquefaction performance. This work reports on a room temperature magnetocaloric refrigeration prototype designed with helium as the heat transfer fluid and packed particle Gd 0.8875 Ce 0.1025 Si 0.84 Cr 0.19 as the refrigerant. The temperature spans and cooling power with three different particle sizes at two different operating cycles were measured. A maximum temperature span of 16.7 K and a maximum cooling power of 8.6 W kg−1 were obtained. Reduction of performance in the faster cycle was observed in larger particles due to insufficient thermal diffusion time and its implications for cryogenic temperatures are discussed. A numerical model was developed based on the experimentally observed variation of the temperature span and cooling power with particle size and cycle duration. This model was then used to study the competing effects of viscous dissipation and thermal diffusion for different particle sizes and cycle durations. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Refrigeration is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 175546363
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PubTypeId: academicJournal
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  Data: Optimisation of a packed particle magnetocaloric refrigerator: A combined experimental and theoretical study.
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  Data: <searchLink fieldCode="AR" term="%22Adapa%2C+Sarath+R%2E%22">Adapa, Sarath R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Feng%2C+Tianshi%22">Feng, Tianshi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ihnfeldt%2C+Robin+V%2E%22">Ihnfeldt, Robin V.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> rihnfeldt@geandr.com</i><br /><searchLink fieldCode="AR" term="%22Chen%2C+Renkun%22">Chen, Renkun</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> rkchen@ucsd.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Refrigeration%22">International Journal of Refrigeration</searchLink>. Mar2024, Vol. 159, p64-73. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Heat+transfer+fluids%22">Heat transfer fluids</searchLink><br /><searchLink fieldCode="DE" term="%22Helium%22">Helium</searchLink><br /><searchLink fieldCode="DE" term="%22Biomass+liquefaction%22">Biomass liquefaction</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+diffusivity%22">Thermal diffusivity</searchLink><br /><searchLink fieldCode="DE" term="%22Refrigerators%22">Refrigerators</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Room-temperature magnetocaloric refrigeration prototype with helium as the heat transfer fluid and packed particle Gd 0.8875 Ce 0.1025 Si 0.84 Cr 0.19 as the refrigerant. • Measurements on temperature spans and cooling power with three particle sizes at two different operating cycles. • Reduction of performance in large particles from insufficient thermal diffusion in faster cycle. • Validated numerical model and compared effects of viscous dissipation and thermal diffusion. • Implications of magnetocaloric refrigerant with low thermal diffusivity for cryogenic temperatures discussed. Magnetocaloric refrigeration has strong potential towards achieving high efficiency hydrogen liquefaction. Optimising parameters such as particle size and operating cycles can have a significant impact on liquefaction performance. This work reports on a room temperature magnetocaloric refrigeration prototype designed with helium as the heat transfer fluid and packed particle Gd 0.8875 Ce 0.1025 Si 0.84 Cr 0.19 as the refrigerant. The temperature spans and cooling power with three different particle sizes at two different operating cycles were measured. A maximum temperature span of 16.7 K and a maximum cooling power of 8.6 W kg−1 were obtained. Reduction of performance in the faster cycle was observed in larger particles due to insufficient thermal diffusion time and its implications for cryogenic temperatures are discussed. A numerical model was developed based on the experimentally observed variation of the temperature span and cooling power with particle size and cycle duration. This model was then used to study the competing effects of viscous dissipation and thermal diffusion for different particle sizes and cycle durations. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Refrigeration is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.ijrefrig.2023.12.039
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 64
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      – SubjectFull: Heat transfer fluids
        Type: general
      – SubjectFull: Helium
        Type: general
      – SubjectFull: Biomass liquefaction
        Type: general
      – SubjectFull: Thermal diffusivity
        Type: general
      – SubjectFull: Refrigerators
        Type: general
    Titles:
      – TitleFull: Optimisation of a packed particle magnetocaloric refrigerator: A combined experimental and theoretical study.
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            NameFull: Adapa, Sarath R.
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            NameFull: Feng, Tianshi
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            NameFull: Ihnfeldt, Robin V.
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            NameFull: Chen, Renkun
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          Dates:
            – D: 01
              M: 03
              Text: Mar2024
              Type: published
              Y: 2024
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              Value: 159
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            – TitleFull: International Journal of Refrigeration
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