MWCNTs-PEG/HFS composite phase change thermal storage material was prepared by sol-gel method using polyethylene glycol (PEG) as phase change material(PCMs),hydrophilic SiO2 (HFS) as the setting carrier and multi-walled carbon nanotubes (MWCNTs) as thermal conductive fillers.The microstructure,heat storage performance and conductivity of MWCNTs-PEG/HFS composite PCMs were characterized by specific surface area and pore size analyzer,thermal conductivity tester,scanning electron microscope and differential scanning calorimeter.By blending MWCNTs-PEG/HFS PCMs with ordinary portland cement,the novel heat storage cement boards were prepared,and the thermal conductivity and heat storage performance were tested.The results shown that MWCNTs-PEG/HFS PCMs possessed higher thermal conductivity and better phase change heat storage capacity.The composite PCMs can increase the porosity of the internal structure of cement boards,which leaded to a reduction in thermal conductivity.Moreover,according to the simulation results of ANSYS finite element analysis software and practical test,the composite thermal storage cement board can storage heat,regulate temperature and save energy after adding MWCNTs-PEG/HFS PCMs.
Li Zhigang, Wang Jie
. The preparation of MWCNTs-PEG/HFS composite PCMs and its effect on thermal property of cement board[J]. New Chemical Materials, 2020
, 48(8)
: 75
-79
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.08.016
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