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).


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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