多孔砌块外墙孔内自然通风的热过程分析

Heat Process Analysis of Porous Block External-wall Pore under Natural Ventilation

基于物理模型,利用MATLAB软件模拟分析了北京和南京地区民用建筑南外墙在夏季典型气候与太阳辐射共同作用下,在结合了绝热材料（EPS）的三排孔砌块中,自然通风对室内的热影响。结果表明：北京地区随着楼层的升高,其节能的效果呈现先升高后降低的趋势,存在一个峰值接近90%;南京地区随着楼层的升高,其节能效果呈现下降的趋势,在3层时为最高值在60%～70%之间。北京通风墙体的热阻相较不通风时的墙体热阻,最高可提高43.4%,最低提高28.4%;南京通风墙体的热阻相较不通风时的墙体热阻,最高提高了23.2%,最低提高了13.7%。通风墙体在北京更加适用于中高层民用建筑,而在南京更加适用于多层民用建筑。

Based on physical model, combined effect of a typical summer climate and solar radiation, the simulation for south wall of civil architecture in Nanjing and Beijing is analyzed by MATLAB software that the indoor heat influence of the natural ventilation is effected, combined with thermal insulation material（EPS） in different combination of the threehole block. The results show that, the energy saving effect is increased at first and then decreased in Beijing as the rising floor in Beijing area, meanwhile, a peak value is nearly 90%; however in Nanjing the trend of the energy saving effect appears fallen along with the increase of floor, there is a peak value between 60% and 70% at the three floor. When the thermal resistance of the wall is unventilated, the highest thermal resistance of the wall in Beijing is increased by 43.4%and the lowest thermal resistance is increased by 28.4%; compared with in Nanjing, the highest thermal resistance of the wall is increased 23.2% and the lowest of that is increased 13.7%. Therefore, the ventilation wall is more suitable for the high-rise building in Beijing, that is more suitable for multiple-story building.