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Properties of n-Octadecane PCM Composite with Recycled Aluminum as a Thermal Enhancer.

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Title: Properties of n-Octadecane PCM Composite with Recycled Aluminum as a Thermal Enhancer.
Authors: Cobîrzan, Nicoleta1,2 (AUTHOR), Thalmaier, Gyorgy2,3 (AUTHOR) gyorgy.thalmaier@sim.utcluj.ro, Mihaela, Crețu2,3,4 (AUTHOR), Năsui, Mircea2,4,5 (AUTHOR), Micu, Dan Doru2,4,5 (AUTHOR)
Source: Materials (1996-1944). Dec2025, Vol. 18 Issue 24, p5638. 14p.
Subjects: Octadecane, Thermal conductivity, Cooling systems, Solar heating, Aluminum recycling, Phase change materials, Latent heat
Abstract: This paper presents new types of PCM composites proposed and analyzed for cooling applications in buildings. The composites (n-octadecane-Al-long/n-octadecane-Al-short) were made of n-octadecane with 7% and 7.5% vol. of recycled aluminum added as a thermal conductivity enhancer to avoid sinking during the melting phase and to improve thermal conductivity. Recycled aluminum chips are inexpensive, abundant, and generate a lower environmental impact during composite production. The effect of the chip content was found to increase the thermal conductivity values of the composites by 100% (n-octadecane-Al short) and by 600% (n-octadecane-Al-long) compared to n-octadecane. The percentage of mass increase remained low. The latent heat of n-octadecane-Al-long decreased from 245 kJ/kg to 195 kJ/kg, the melting time shortened from 990 s to 850 s, and the CO2 emission reduction was by 150 kg CO2eq/year. The volume of the PCM composites varied from 0.083 m3 (n-octadecane) to 0.091 for n-octadecane-Al-long, which represents an increase of up to 11% needed to absorb the solar heat gained by the optimized PCM composite. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI 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.)
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Header DbId: egs
DbLabel: Engineering Source
An: 190471571
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Properties of n-Octadecane PCM Composite with Recycled Aluminum as a Thermal Enhancer.
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Dec2025, Vol. 18 Issue 24, p5638. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Octadecane%22">Octadecane</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Cooling+systems%22">Cooling systems</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+heating%22">Solar heating</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+recycling%22">Aluminum recycling</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+change+materials%22">Phase change materials</searchLink><br /><searchLink fieldCode="DE" term="%22Latent+heat%22">Latent heat</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This paper presents new types of PCM composites proposed and analyzed for cooling applications in buildings. The composites (n-octadecane-Al-long/n-octadecane-Al-short) were made of n-octadecane with 7% and 7.5% vol. of recycled aluminum added as a thermal conductivity enhancer to avoid sinking during the melting phase and to improve thermal conductivity. Recycled aluminum chips are inexpensive, abundant, and generate a lower environmental impact during composite production. The effect of the chip content was found to increase the thermal conductivity values of the composites by 100% (n-octadecane-Al short) and by 600% (n-octadecane-Al-long) compared to n-octadecane. The percentage of mass increase remained low. The latent heat of n-octadecane-Al-long decreased from 245 kJ/kg to 195 kJ/kg, the melting time shortened from 990 s to 850 s, and the CO2 emission reduction was by 150 kg CO2eq/year. The volume of the PCM composites varied from 0.083 m3 (n-octadecane) to 0.091 for n-octadecane-Al-long, which represents an increase of up to 11% needed to absorb the solar heat gained by the optimized PCM composite. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI 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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        Value: 10.3390/ma18245638
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 5638
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      – SubjectFull: Octadecane
        Type: general
      – SubjectFull: Thermal conductivity
        Type: general
      – SubjectFull: Cooling systems
        Type: general
      – SubjectFull: Solar heating
        Type: general
      – SubjectFull: Aluminum recycling
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      – SubjectFull: Phase change materials
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      – SubjectFull: Latent heat
        Type: general
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      – TitleFull: Properties of n-Octadecane PCM Composite with Recycled Aluminum as a Thermal Enhancer.
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            NameFull: Cobîrzan, Nicoleta
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              Text: Dec2025
              Type: published
              Y: 2025
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              Value: 18
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            – TitleFull: Materials (1996-1944)
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