彩钢板饰面层外墙外保温系统温度场分析

Analysis on Temperature Field of External Thermal Insulation Composite Systems with Colorful Steel Plate

以大尺寸耐候试验箱的彩钢板饰面层外墙外保温系统为试验对象,提出了一套完整的外保温系统构造层温度场实测方案,测得高温-淋雨循环下彩钢板饰面层外墙外保温系统各构造层温度数据;根据实测结果对比分析了分别以泡沫玻璃、硬泡聚氨酯和泡沫混凝土作为保温材料的外墙外保温系统构造层温度场分布特征、延迟时间和衰减系数.结果表明,彩钢板饰面层外墙外保温系统饰面层、保温层的温度变化特征与箱内气温一致,界面层受箱内气温影响较小,变化比较平缓;窗口位置温度波动幅度较墙体中心位置大;硬泡聚氨酯保温隔热效果优于泡沫玻璃和泡沫混凝土.各系统墙体的温度波动在各构造层中的延迟时间相同,保温层使得墙体温度场衰减显著.

An experimental design was constructed to measure the temperature field on an external thermal insulation composite system（ETICS） with colorful steel plate（CSP）. Three rigs of ETICS with CSP finish of various insulation materials（foam glass, rigid polyurethane foam and foam concrete） were tested inside a weathering test chamber. The thermal fields of the rigs were measured during the heat-rain cycles. Based on the measured temperature data, distribution of temperature on the wall＇s structural layer,time lag and decrement factor were explored. The results show that the temperatures of the CSP finish and the outer face of the insulation layer tend to change in accordance with the air temperature of the chamber; the temperatures of CSP finish change quickly and intensely（especially near the window） while the temperatures of the bonding layer change slowly. Among the three insulation materials, the rigid polyurethane foam is the most efficient in energy-conserva- tion. In all three ETICSs, each layer tends to cause time lag and decrease in the transmission of thermal waves from the exterior to interior parts, being more obvious in the insulation layer.