含二氧化硅气凝胶和相变材料三层玻璃窗热性能分析

为了研究含二氧化硅气凝胶和相变材料三层玻璃窗对严寒地区建筑能耗的影响,建立了相变材料层与其他透明壁层结合发生的传热数值模型。分析了含二氧化硅气凝胶和相变材料三层玻璃窗在不同二氧化硅气凝胶厚度、导热系数和不同保温材料下的动态热调节性能,得到了含二氧化硅气凝胶和相变材料三层玻璃窗内表面热流密度和液相率随时间的变化规律。结果表明:随着二氧化硅气凝胶厚度增加,总传热量降低和液相率增加,当二氧化硅气凝胶厚度为20～30 mm时,可以实现有效的利用太阳能;随着二氧化硅气凝胶导热系数增加,总传热量升高和液相率降低;当二氧化硅气凝胶的导热系数从0.022降低到0.014 W/(m·K)时,最大液相率从0.83增加到1.00。二氧化硅作为保温层比相变材料作为保温层具有更好的保温隔热作用。

Thermal performance analysis on three-layer glass window containing silica aerogel and phase change material

In order to study the influence of three-layer glass window containing silica aerogel and phase change material on building energy consumption in severe cold regions, a numerical model of heat transfer occurred in combination with phase change material layer and other transparent wall layers was established. The dynamic thermal regulation properties of three glass windows containing silica aerogel and phase change material under different silica aerogels thickness, thermal conductivity and different thermal insulation materials were analyzed. The heat flux and liquid phase rate of the three layer glass window containing silica aerogel and phase change material were obtained over time. The results show that as the thickness of the silica aerogel increases, the total heat transfer decreases and the liquid phase increases. When the thickness of the silica aerogel ranges from 20 mm to 30 mm, efficient use of solar energy can be achieved. As the thermal conductivity of the silica aerogel increases, the total heat transfer increases, and the liquid phase decreases. When the thermal conductivity of the silica aerogel decreased from 0.022 W/(m·K) to 0.014 W/(m·K), the maximum liquid phase rate increased from 0.83 to 1, and the peak time was delayed by 2 h. Silica as a thermal insulation layer has better thermal insulation effect than a phase change material as an insulation layer.