Preparation and properties of paraffin/jujube carbon composite phase change materials
In this study,the freeze-dried powder(FDJ)of waste jujube was used as a carrier for phase change materials.The vacuum impregnation method was used to adsorb paraffin from phase change core materials,and the thermal storage capacity and thermal re-sponse efficiency of the materials were studied.Polyvinyl alcohol aqueous solution was used to reduce the leakage value of the materi-als.The results showed that the phase transition enthalpy of polyvinyl alcohol/jujube carbon paraffin carbon composite phase change material(PVA/CFDJ)was 126.41 J/g,and the thermal conductivity was 0.216 3 W/m·k,which is 60.5%higher than that of pure paraffin.In the storage-discharge heat cycle test,the enthalpy value of the PVA/CFDJ material was only reduced by about 4%after 100 cycles,and the leakage rate was reduced to 3.2%.The PVA/CFDJ composite has the characteristics of high phase transition enthalpy,high thermal conductivity and low leakage rate,which not only improve the added value of biomass materials with regional characteris-tics,but also provide new ideas for novel building energy storage materials.
freeze-dried jujube powderparaffinphase change material
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