This technology involves high-thermal-storage interior wall panels and their manufacturing method, created by applying a silica gel thin-film coating via a sol-gel process to 0.8mm porous activated carbon fine aggregate impregnated with n-hexadecane phase change material (PCM), and then evenly dispersing this aggregate within lightweight foamed concrete.
With the building and construction sector accounting for approximately 30% of domestic energy emissions, residential energy-saving technologies have become urgent. However, while existing lightweight foamed concrete panels offer excellent insulation and lightweight properties, they lack the thermal storage function to store and release heat. Previous thermal storage materials, which absorb PCM into fibers or porous bodies, also faced issues with PCM leakage or loss during use, preventing long-term performance.
This technology involves impregnating 100 volume parts of PCM with 80 volume parts of activated carbon under vacuum for 2 hours, followed by solidification and coating with a silica gel thin film under conditions of pH 3–4 for the sol solution and pH 7–8 for gelation to seal the surface pores of the activated carbon. It stores 73.6 J/g of thermal energy during cooling and 71.16 J/g during heating. This aggregate is used to replace 20–60 wt% of fine aggregate and is mixed with quicklime, cement, anhydrous gypsum, and a foaming agent, then cast and cured in a mold containing reinforcing bars. Applicable to interior walls of apartment complexes, interior finishes for passive houses and zero-energy buildings, and lightweight partition walls in schools and offices, it stores daytime heat and releases it at night without damaging the independent cells of the foamed concrete, thereby reducing heating and cooling loads without additional equipment.
This invention was developed with support from the Ministry of Land, Infrastructure and Transport's research on safety and performance evaluation technology for nano-concrete.
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