含相变材料双层玻璃窗光热分析模型

建立了含相变材料双层玻璃窗的光热传输模型,考虑相变材料和玻璃半透明特性,采用有限差分求解方程。在通过实验数据验证模型准确的基础上,分析了相变材料的融化温度对含相变材料双层玻璃窗光热性能的影响。结果显示:建立的模型可模拟相变材料双层玻璃窗的光热传输过程;随融化温度升高,含相变材料双层玻璃窗温度衰减因子则逐渐增大,相变材料融化时间延后,相变材料呈液态的时间变短,但温度滞后值、热流密度和太阳透射能则呈不规则变化。

Optical and thermal properties analysis model of double glazed windows filled with PCM

The optical and heat transfer model with double glazing windows was developed accounting in the semi-transparent property of PCM and glass. The energy equations were simulated by FDM. The effect of melting temperature on heat storage performance of glass window was analyzed, which is on the basis of model validation by experimental data. The result shows that the model developed in this paper can be used to simulate the optic and heat transfer process of double glazed windows filled with PCM. With the melting temperature increasing, the temperature decreasing factor rises, the melting temperature delays, the time of liquid state reduces, but the temperature lag value, heat flux and transmitted solar energy changes irregularly.