室外气候作用下建筑外墙含湿量对热工性能的影响

The Influence of Thermal Properties of Exterior Walls under the Action of Moisture Content when in Outdoor Climate

根据多孔介质热湿传递机理,分析了室外气候荷载作用下含湿量变化对建筑墙体的温度波衰减系数、温度波延时时间等热工性能参数的影响.结果显示,随着含湿量的增加,墙体的有效导热系数和容积比热均增大,然而含湿量增大可减小温度波通过墙体时的衰减系数,同时增大了温度波达到墙内表面的延时时间.这些特性有利于减少温度波对室内环境舒适性的影响,尤其是对非空调的通风房间舒适性的影响.

According to the heat and moisture transfer mechanism of porous medium, the study analyzed the heat engineering performance parameters caused by the change of moisture content under the influence of outdoor climate load such as the temperature wave attenuating coefficient and the time duration of temperature wave delay of building walls and other coefficient of thermal properties, The results indicated that as the moisture content increases, the effective thermal conductivity and the volume specific heat of walls both increase. However, the increase of humidity shall decrease the weakening coefficient of temperature wave when transmitting through the walls, and at the same time increase the delay time temperature wave when reaching the indoor surface of walls. These features shall be good for decreasing the influence of temperature wave to the comfortibility of indoor environment, especially for decreasing the influence of the comfortibility of the rooms without air-conditioners.