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Experimental studies on the supercooling and melting/freezing characteristics of nano-copper/sodium acetate trihydrate composite phase change materials

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  • Cui, Wenlong
  • Yuan, Yanping
  • Sun, Liangliang
  • Cao, Xiaoling
  • Yang, Xiaojiao

Abstract

This paper reports that Nano-copper (Nano-Cu), which possesses high thermal and electrical conductivity, as an additive, can improve the supercooling properties of sodium acetate trihydrate (CH3COONa·3H2O, SAT) and enhance its thermal conductivity. To investigate the effect of Nano-Cu content on the degree of supercooling of SAT, composite phase change materials containing SAT, Nano-Cu (0.4%, 0.5%, 0.6%, 0.7% and 0.8%), CMC (thickening agent) and sodium dodecyl sulfonate (C12H25NaO3S, dispersant) were prepared. Melting-freezing experiments involving the composite materials indicated that the rate of heat transfer increased by nearly 20%. When an optimal amount of Nano-Cu (i.e., 0.5%) was added to SAT, the degree of supercooling was reduced to approximately 0.5 °C. Compared to the use of inorganic salt hydrates as nucleating agents, Nano-Cu is significantly advantageous in reducing the degree of supercooling of SAT. The maximum improvement in supercooling was observed when the melting-freezing experiment was conducted at an initial temperature of 70 °C. The thermal conductivity of the reported composite phasechange materialsis approximately 20% higher than that of pure SAT.

Suggested Citation

  • Cui, Wenlong & Yuan, Yanping & Sun, Liangliang & Cao, Xiaoling & Yang, Xiaojiao, 2016. "Experimental studies on the supercooling and melting/freezing characteristics of nano-copper/sodium acetate trihydrate composite phase change materials," Renewable Energy, Elsevier, vol. 99(C), pages 1029-1037.
    • Handle: RePEc:eee:renene:v:99:y:2016:i:c:p:1029-1037
    DOI: 10.1016/j.renene.2016.08.001
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    References listed on IDEAS

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