Study On The Performance Of Metal Particles And Carbon Nanotubes Synergistically Reinforced Foam-based Composite Phase Change Materials

Solid-liquid phase transition energy storage materials have attracted much attention in the utilization of solar thermal energy because of their suitable phase transition temperature and high thermal energy storage density.However,traditional solid-liquid phase change materials are prone to leakage,low thermal conductivity,and poor energy conversion function are the primary problems that need to be solved in the application.Based on this,this research designed a new type of supporting and shaped composite phase change energy storage material with high thermal conductivity,high latent heat of phase change,and not easy to leak,and explored the metal nanoparticle/carbon nanotube composite material(M-NPs@CNTs)The effect of the type,content,type of supporting matrix and pore density on the thermal conductivity and latent heat capacity of the composite phase change material,and the micro morphology and chemical composition of the phase change composite material(CPCM)were tested.The results of this research are as follows:(1)Through the vacuum impregnation and melt blending process design,n-octadecane(C18)is used as the phase change material,and the pore density is 40 PPI,70PPI,and 110 PPI foam nickel(NF)as the support material,successfully prepared C18/ NF shaped composite phase change material.When the NF pore density is 110 PPI,the phase change latent heat value reaches 131.08 J/g,and the thermal conductivity of CPCM is increased by 318%compared with pure C18.The experimental results show that the thermal conductivity,latent heat performance and thermal stability of CPCM with 110 PPI NF as the carrier are better than those of CPCM with 40 PPI and 70 PPI NF as the carrier.(2)Through vacuum impregnation and melt blending process design,C18 is used as phase change material,110 PPI NF is used as carrier,and M-NPs@CNTs is composite thermal conductive filler,and C18/M-NPs@CNTs/NF shaped composite is successfully prepared.Phase change material.As the content of M-NPs@CNTs continues to increase,the thermal conductivity of CPCM also continues to increase.When the Ag NPs@CNTs mass fraction in CPCM is 10 wt%,the maximum thermal conductivity of CPCM is 2.80 W/(m·K),and the pure C18 is increased by 699%,and the thermal conductivity of CPCM is significantly improved.The experimental results show that the rich network framework structure of M-NPs@CNTs and NF provides huge surface tension to adsorb C18,the thermal stability and shape stability of CPCM are excellent,and the latent heat of CPCM phase change doped with1wt% Ag NPs@CNTs The value reaches 182.5J/g,and the thermal conductivity also reaches2.01W/(m·K).(3)Through the design of vacuum impregnation and melt blending process,C18 is used as phase change material,110 PPI porous silicon carbide(SF)is used as carrier,and M-NPs@CNTs is heat conduction enhancement material to prepare C18/M-NPs@CNTs/ SF shaped phase change material.C18/1wt%Ag NPs@CNTs is filled in the pores of SF,while ensuring excellent shape stability,the latent heat of melting phase change reaches 190.31J/g,and the phase change temperature(30.67℃)is also close to that of pure C18(31.34℃),its thermal conductivity has also reached 2.27 W/(m·K),which is 549% higher than pure C18.In addition,the addition of M-NPs@CNTs makes CPCM have excellent thermal conductivity.When the mass fraction of Ag NPs@CNTs in CPCM is 10 wt%,its thermal conductivity is2.68 W/(m·K),which is higher than pure C18 It’s 666%.The ANSYS finite element analysis software is used to numerically simulate the heat transfer process of C18/NF.The experimental test temperature of the CPCM surface is similar to the ANSYS numerical simulation temperature.