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以工业石蜡为相变芯材,通过真空吸附法和硅酸钙外壳封装法制备石蜡/膨胀珍珠岩复合相变材料和复合相变储能砂浆.利用SEM和差示扫描量热法分析了石蜡/膨胀珍珠岩相变材料的形貌和蓄热能力,测试了复合相变储能砂浆的抗压强度、干表观密度、导热系数和三维条件下材料温度时间响应关系.结果表明,经硅酸钙外壳封装后石蜡/膨胀珍珠岩相变材料中石蜡的含量约为55.47%时,相变温度和相变潜热分别为35.59℃和96.77J/g;复合相变储能砂浆的28d抗压强度,干表观密度和导热系数分别为8.0MPa,1 678kg/m~3和0.46W·m~(-1)·K~(-1),在外界温度变化时,复合相变储能砂浆相对于传统砂浆材料具有升温和降温速度变化平缓,可用作保温砂浆.
Paraffin / expanded perlite composite phase change material and composite phase change energy storage mortar were prepared by vacuum adsorption and calcium silicate shell encapsulation method with industrial paraffin as phase change core material.The paraffin wax was analyzed by SEM and differential scanning calorimetry / Expanded perlite phase change material morphology and heat storage capacity of the composite phase change energy storage mortar compressive strength, dry apparent density, thermal conductivity and material temperature-time response under three-dimensional conditions.The results show that the silicon The paraffin wax content of paraffin / expanded perlite phase change material is about 55.47%, the phase transition temperature and latent heat of phase transformation are 35.59 ℃ and 96.77J / g respectively after encapsulating calcium carbonate shell; the 28d compressive strength of composite phase change energy storage mortar The strength, dry apparent density and thermal conductivity were 8.0MPa, 1678kg / m ~ 3 and 0.46W · m ~ (-1) · K ~ (-1) respectively. When the outside temperature changed, the composite phase change energy storage mortar Relative to the traditional mortar material with a slow change in temperature and cooling rate can be used as thermal insulation mortar.