相变微囊复合建材制备及储放热研究

通过采用微乳化技术,将水分散于常温相变储能石蜡中;应用膜孔法,以海藻酸钠包封常温相变石蜡,制得储能微囊;将微囊与石膏基体复合后,制备得到储能建筑材料.研究发现:储能微囊为球形,其粒度分布范围窄;相变含水石蜡微囊储能建筑材料的储能密度得到显著提高,在低于常温相变石蜡固-液相变温度下,其导热系数减小,储/放热时间明显延长,对环境温度的变化响应滞后时间加大,维持恒定温度的时间得到较大延长.

Preparation of Phase Transition Microcapsule Compound Building Material and Heat Storage/Release Research

Through dispersed water in normal atmospheric temperature phase change paraffin stably by microemulsification technique,then selected the used sodium alginate as the microcapsule wall material and selected fenestra method to prepare the power storage microcapsules.The microcapsules were compounded with gypsum to prepare building material.Microscope and particle size analyses show that the microcapsules were spheric and in narrow particle size distribution. The power storage density has notable improvement after mixed the water in the paraffin,and the thermal conductivity decreases when temperature is lower than the solid-liquid transition temperature of the paraffin.Heat storage/release testing indicates that the heat storage/release time of the water containing phase change heat storage building material becomes longer obviously,and the lagging time to response the environment temperature change becomes longer,so it could maintain a constant temperature for a longer time.