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Experimental and Photothermal Performance Evaluation of Multi-Wall Carbon-Nanotube-Enhanced Microencapsulation Phase Change Slurry for Efficient Photothermal Conversion and Storage

Author

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  • Changling Wang

    (School of Energy and Environment, Southeast University, Nanjing 210016, China
    Engineering Research Center of Building Equipment, Energy, and Environment, Ministry of Education, Nanjing 201016, China
    Shenzhen Research Institute, Southeast University, Shenzhen 518000, China)

  • Guiling Zhang

    (School of Energy and Environment, Southeast University, Nanjing 210016, China
    Engineering Research Center of Building Equipment, Energy, and Environment, Ministry of Education, Nanjing 201016, China
    Shenzhen Research Institute, Southeast University, Shenzhen 518000, China)

  • Xiaosong Zhang

    (School of Energy and Environment, Southeast University, Nanjing 210016, China
    Engineering Research Center of Building Equipment, Energy, and Environment, Ministry of Education, Nanjing 201016, China
    Shenzhen Research Institute, Southeast University, Shenzhen 518000, China)

Abstract

Melamine formaldehyde was used as the shell material and n-eicosane as the core material with the method of in situ polymerization to synthesize microencapsulated phase change materials (MPCMs). To enhance the thermophysical characteristics and photothermal conversion performance of the MPCM slurry, multi-wall carbon nanotubes were added, and the microscopic morphology and thermophysical parameters of the MWCNT-MPCM slurry were analyzed. The thermal conductivity, viscosity, and photothermal conversion properties of the slurry were examined. The results indicated that the synthesized MPCMs were nucleated and unbroken, with a spherical form and a latent heat of phase transition of up to 135.92 kJ/kg. The MPCM was stable when dispersed in water, and its thermal conductivity rose with the temperature but slightly decreased during the phase transition period. The viscosity rose with the addition of the MPCM, with a jump at 20% MPCM content. The addition of MWCNTs had a minor effect on the material’s thermophysical properties. The thermal conductivity increased from 0.55 W/m·°C to 0.6 W/m·°C when MWCNTs were added to the material. The viscosity of a 20% MPCM slurry exceeded 3000 mPa·s when 0.5% MWCNTs were introduced. Under 1 sun of sunlight, the mixture’s peak temperature could reach 60 °C at 0.5% MWCNT concentration. The MWCNT-MPCM slurry is capable of producing efficient solar photothermal conversion without sacrificing other thermophysical properties, and it has several applications in solar energy consumption and thermal engineering.

Suggested Citation

  • Changling Wang & Guiling Zhang & Xiaosong Zhang, 2022. "Experimental and Photothermal Performance Evaluation of Multi-Wall Carbon-Nanotube-Enhanced Microencapsulation Phase Change Slurry for Efficient Photothermal Conversion and Storage," Energies, MDPI, vol. 15(20), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7627-:d:943375
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    References listed on IDEAS

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