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Nanotube modifié à parois multiples en carbone à particules dispersées dans une émulsion d'hexadécane pour réduire le surrefroidissement.

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

Numéro : pap. 427

Auteurs : ZHANG X., NIU J., WU J. Y., et al.

Résumé

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.

Documents disponibles

Format PDF

Pages : 11 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : The modified multi-wall carbon nano-tube dispersed in hexadecane emulsion to reduce supercooling.
  • Identifiant de la fiche : 30009103
  • Langues : Anglais
  • Source : Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Date d'édition : 16/06/2013

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