多场耦合循环作用下屋面保温材料耐候性能

对聚氨酯板、泡沫混凝土板和真空绝热板分别展开冻融、湿热、干湿、高低温和多场耦合循环作用下的耐候性能试验,并结合荷载和湿度等因素对屋面保温复合材料及部品的传热规律和施工过程进行模拟.结果表明:泡沫混凝土板和聚氨酯板在耐候性能试验中质量损失率较大,导热系数随时间延长逐渐上升;而真空绝热板在表面阻隔膜不被刺穿的情况下,其导热系数和质量损失率无显著变化.模拟计算的结果表明:当考虑结构变形时,部品底部温度增长5%.

Weathering Resistance of Roofing Insulation Materials under Multi Field Coupling Cycles

Weathering resistance of polyurethane board, foam concrete board and vacuum insulation panel under the functions of freeze thaw, humid heat, dry wet, high low temperature and multi field coupling cycle, combined with load and moisture migration and other factors on roofing insulation composite materials and parts. The heat transfer rule and construction process were simulated. It is shown that the mass loss rate of the foam concrete board and the polyurethane board in the weathering resistance is larger, and the thermal conductivity is gradually increased with time. However, the thermal conductivity and the mass loss rate of the vacuum insulation panel are not significant without being punctured by external pressure. The results of the simulation calculations show that the bottom temperature increases by 5% when structural deformation is considered.