Phase change materials(PCMs) is the basis of the research of phase change heat storage technology. Aimed at the low thermal conductivity of common phase change material-paraffin

nano particles addition technology was used to enhance the heat transfer performance of paraffin

so the thermal conductivity and thermal diffusion coefficient of paraffin were improved. Through melting test of nano particle-paraffin and observation of settling process of nano particles

Cu nanoparticle and dispersing agent Hitenol BC-10 were selected to prepare a kind of stable nano-particle/paraffin composite phase change storage material

and its thermal physical properties were tested. The experimental results showed that addition of nano-copper particles could increase the thermal conductivity of paraffin apparently. Compared with the pure paraffin

thermal conductivity of solid nano-copper/paraffin increased by 7.9%

the liquid nano-copper/paraffin increased by 3.8%

while the solid and liquid thermal diffusion coefficient increased by 20.6% and 16% respectively.