多孔介质墙体热湿传递实验测试研究

Experimental Test of Heat and Moisture Transfer Law of Porous Media Wall

建筑围护结构中的热湿耦合传递规律研究对于了解其传热性能具有重要意义。利用大型人工环境舱搭建多层加气混凝土墙体测试实验平台,营造了符合三种典型气候的室外舱温湿度环境并随周期性变化,室内舱控制为空气调节下恒定温湿度条件,测试并记录了多层加气混凝土墙体表面及内部不同位置温湿度变化。墙内距离外表面20 mm处测点的相对湿度在夏热冬冷夏季特征气候下降低了7.88%,在夏热冬冷冬季特征气候降低了4.11%,在南海极端热湿特征气候下降低了5.76%。结果表明热传递对湿传递促进的程度大于湿传递对热传递的作用,在高热、高湿的南海地区,热湿耦合作用对墙体热工性能的影响更大。

It is of great significance to study the heat and moisture coupling transfer law in building envelope for understanding its heat transfer performance.A multi-layer aerated concrete wall test platform was built by using a large artificial environment chamber,the outdoor cabin temperature and humidity environment conforming to three typical climates was created and changes periodically,the indoor cabin was controlled under constant temperature and humidity under air conditioning,the changes of temperature and humidity on the surface and inside of multi-layer aerated concrete wall were tested and recorded.The relative humidity of the measuring points 20 mm away from the outer surface in the wall decreased by 7.88%under the characteristic climate of hot summer and cold winter,4.11%under the characteristic climate of hot summer and cold winter,and 5.76%under the extreme hot and humid climate of the South China Sea.Result shows that the effect of heat transfer on moisture transfer is greater than that of moisture transfer.In the South China Sea area with high heat and humidity,the coupling effect of heat and moisture has a greater impact on the thermal performance of the wall.