Objective In order to broaden the application of phase change materials in the field of building energy efficiency and overcome the difficulty for a single phase change material to meet the thermal performance require-ments of buildings.Methods The new type of phase change energy storage aggregate was prepared by using lauryl alcoholl(LA)and myristic acid(MA)as composite phase change materials and shale ceramsite as carrier.The thermal properties of the phase change energy storage aggregates and the phase change cycle stability under dif-ferent packaging methods were analyzed by means of differential scanning calorimeter(DSC),Fourier transform infrared spectrometer(FT-IR)and thermogravimetric analyzer(TG).Results The phase change temperature and la-tent heat of the composite phase change material and phase change energy storage aggregate were 22.08℃,22.92℃ and 182.10J/g,22.33J/g,respectively.There was only a physical mosaic relationship between LA-MA compos-ite phase change material and shale ceramsite,with no material decomposition of phase change energy storage ag-gregate below 70℃.The mass loss rate of styrene-acrylic emulsion encapsulated phase change energy storage ag-gregate was 0.80％after 100 phase change cycles in the 5℃～45℃ temperature range.Conclusion The thermal properties of LA-MA/ceramsite phase change energy storage aggregate meet the requirements of building energy conservation with a stable chemical structure,good thermal stability and excellent cycle durability,able to be ap-plied to the building envelope structure.The research provide a reference to the application of phase change ener-gy storage materials in building envelope structure.
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