CIESC Journal ›› 2015, Vol. 66 ›› Issue (3): 1208-1214.doi: 10.11949/j.issn.0438-1157.20141252

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Preparation and thermal properties of nano-organic composite phase change materials for cool storage in air-conditioning

WU Weidong, TANG Hengbo, MIAO Pengke, ZHANG Hua   

  1. Institute of Refrigeration and Cryogenic Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2014-08-20 Revised:2014-12-08 Online:2015-03-05 Published:2015-03-05
  • Supported by:

    supported by National Natural Science Foundation of China(50606027) and the Natural Science Foundation of Shanghai (14ZR1429000).

Abstract:

One of the greatest challenges in the application of organic phase change materials (PCMs) is to increase their thermal conductivity while maintaining high phase change enthalpy. To prepare nano-organic composite PCMs for air-conditioning cool storage, nanomaterials with high thermal conductivity, including multi-walled carbon nano-tubes (MWNTs), Al2O3 and Fe2O3, were respectively added into the organic composite PCMs of caprylic acid/myristyl alcohol (with mass ratio of 73.7 to 26.3), developed previously in this study. The thermal properties of nano-organic composite PCMs were analyzed by measuring their thermal conductivity coefficient. The kinds and concentrations of nano-materials are key influencing factors. The experiments showed that heat conductivities increased obviously when mass fractions of MWNTs, Al2O3 and Fe2O3 nanomaterials were less than 0.3%, 0.4% and 0.8%, respectively. Compared with the original PCMs, heat conductivity increased by 26.3% when mass fraction of MWNTs was 0.3%; heat conductivity increased by 13.1% when mass fraction of Al2O3 was 0.4%; the heat conductivity increased by 32.1% when mass fraction of Fe2O3 was 0.8%. The thermal conductivity enhancement effects were in the order of Fe2O3, MWNTs and Al2O3 at a specific mass fraction (e.g., 0.7%) of nanomaterials. The nano-organic composite PCMs prepared had a limited influence on phase change temperature and phase change enthalpy of the original PCMs, fluctuation of phase change temperature was less than 0.4℃, and the greatest fluctuation range of phase change enthalpy was 1.4%.

Key words: organic phase change materials, cool storage in air-conditioning, nanomaterials, thermal properties, heat transfer enhancement, heat conduction, preparation

CLC Number: 

  • TK02
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