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The modified multi-wall carbon nano-tube dispersed in hexadecane emulsion to reduce supercooling.

Number: pap. 427

Author(s) : ZHANG X., NIU J., WU J. Y., et al.

Summary

Paraffin waxes as phase change materials (PCM) are cheap with moderate thermal storage densities and a suited range of melting temperatures for air-conditioning systems. But they generally tend to become supercooled during the phase change process, especially in microscopic geometries, and they have low thermal conductivity, which both limit their applications. PCM emulsions have better heat-transfer rates than the original materials but supercooling is expected to increase along with the droplets decline. In this study, a hexadecane-water emulsion with small droplet size was prepared and analyzed. The modified multi-wall carbon nano-tube (MWCNT) particles were dispersed in an emulsion as the nucleating agent to reduce supercooling. The MWCNT particles were modified with strong acids H2SO4 and HNO3 to increase the compatibility with the organic liquid. Thermal analysis of the hexadecane-water emulsions with well dispersed MWCNT particles by differential scanning calorimeter (DSC) indicated that the supercooling of emulsion was significantly decreased. The effective ranges of nucleating agent concentration were summarized which provided a promising way of improving the performance of system energy efficiency in building cooling and heating applications.

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Pages: 11 p.

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Details

  • Original title: The modified multi-wall carbon nano-tube dispersed in hexadecane emulsion to reduce supercooling.
  • Record ID : 30009103
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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