影响真空玻璃传热系数的主要因素分析

Main Factors to Influence Heat Transfer Coefficient of Vacuum Glazing

为进一步降低真空玻璃的传热系数,研究了影响真空玻璃传热系数的主要因素。根据真空玻璃传热系数计算公式,得出Low-E玻璃辐射热导和支撑物热导为影响真空玻璃传热系数的主要因素。分析了Low-E玻璃辐射率,支撑物尺寸、形状、材料和方阵间距对真空玻璃传热系数的影响。结果表明:真空玻璃U值随着Low-E玻璃辐射率降低而降低。双Low-E真空玻璃U值最小,当辐射率低于0.16时,单Low-E真空玻璃U值低于最高配置(三玻两腔三Low-E充氩气)的中空玻璃。Low-E玻璃辐射率越小,双Low-E真空玻璃和单Low-E真空玻璃的U值越接近。支撑物宜选圆柱或圆环形。当支撑物与玻璃接触面积减小,支撑物材料导热系数降低,支撑物方阵间距增大时,真空玻璃U值将减小。

A The main factors to influent U value of vacuum glazing are researched in order to reduce the heat transfer coefficient（U value） of vacuum glazing. The radiation conductance of Low-E glass and pillar conductance are verified through the calculation formula of U value. The influence of emissivity of Low-E glass, the size of pillar, the shape of pillar, the material of pillar and pillar array distance on U value are analyzed. The result shows that U value of vacuum glazing is reduced with the reduction of emissivity of Low-E glass. The U value of double Low-E vacuum glazing is the lowest. When the emissivity of Low-E glass is lower than 0.16, the U value of single Low-E vacuum glazing is lower than triple insulating glass with the highest configuration. The U value of single Low-E vacuum glazing and double Low-E vacuum glazing are closer with the reduction of emissivity of Low-E glass. The optimized shape of pillar is cylinder or circle. The U value of vacuum glazing will be reduced with the reduction of the contact area between pillar and glass, the reduction of the thermal conductivity of pillar material, the increase of pillar array distance.