太阳辐射下建筑外微气候的实验研究——建筑外表面温度分布及气流特征

STUDY ON SOLAR RADIATION EFFECTS ON THE MICROCLIMATE OF BUILDING ENVELOPE:THE CHARACTERISTICS OF EXTERNAL SURFACE TEMPERATURE AND AIRFLOW

通过一段时间内对某栋典型多层板楼建筑外微气候相关参数的监测 ,总结其规律如下 :1)在太阳强辐射时间内 ,不同朝向的外墙外表面温度随高度分布的情况不同 ,西向外墙表面温度随高度变化幅度最大 ,其外表面垂直温度的最大温差一般可在 2℃以上 ,标准偏差约在 0 6℃以上 ;2 )多数时间内 (主要为下午 2点左右到次日凌晨 ) ,西墙外表面温度以 1层最高 ;3)建筑热外表面可产生诱导上升热气流。并在综合分析了如太阳辐射、长波辐射。

The external microclimate parameters of a typical multistory building were measured during a period of time. During the sunshine period, the vertical distribution of external surface temperature on different orientation of building differs from one another, and the maximum discrepancy of vertical temperature appears on the external surface of west oriented wall, whose maximum difference of vertical temperature is above 2°C and the standard deviation of the temperature is above 0.6°C. Most of the time (from 2 p.m. to next dawn), the external surface temperature of the lowest floor wall faced west is higher than that of others. The rising of induced airflow on the heated external surface of building was examined, and based on the combined analysis of affecting factors such as solar radiation, long wave radiation and convection, a reasonable explanation was presented.