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Investigation on thermo-physical properties of aqueous suspension of nanoencapsulated phase change materials.

Number: pap. n. 1311

Author(s) : WANG J., JIA L., CHEN Y., et al.

Summary

Nanoencapsulated phase change materials (NEPCM) composed of n-octadecane as the core and polymethyl methacrylate as the shell were fabricated by in situ polymerization first and then dispersed into the water to prepare aqueous suspensions by a two-step method. The aqueous suspensions of NEPCMs showed good dispersion stability and had a uniform size distribution. The thermal and rheological properties of the aqueous suspensions of NEPCMs were investigated, emphasizing on the effects of NEPCM concentration and operating temperature. The specific heat capacity and viscosity were measured by a differential scanning calorimeter and a rotational rheometer, respectively. The results showed that as the NEPCM concentration increased, the specific heat capacity of the aqueous suspension decreased slightly in the single-phase region and increased drastically in the two-phase region. The overall specific heat capacity of the aqueous suspension increased with increasing NEPCM concentration. The viscosity of the aqueous suspension of NEPCMs increased with increasing NEPCM concentration and decreased as the temperature increased. It was found that the NEPCM-caused increase in specific heat capacity is more significant than that in viscosity. Thus, the aqueous suspensions of MEPCMs prepared possessed potential for use as a latent functionally thermal fluid for high-efficiency heat dissipation systems.

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Details

  • Original title: Investigation on thermo-physical properties of aqueous suspension of nanoencapsulated phase change materials.
  • Record ID : 30025926
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1311

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