自然状态草地式屋顶绿化隔热特性分析

在夏季自然通风状态下对重庆有绿化屋顶和无绿化屋顶内表面温度和气候参数进行了测量。通过对测量数据的统计分析,得到以下结论:屋顶绿化对降低屋顶内表面最高温度的效果非常显著,降低平均温度效果稍差,热天气有绿化屋顶内表面对空气的总平均增温量为无绿化屋顶的1/4左右;以天为周期,有绿化屋顶内表面对空气的增温量与太阳辐射照度的变化有较强的反向性,以一段晴雨天气为周期,这种反向性减弱,而以整个夏季的热天气为周期,这种反向性转变为很强的正向性;对于无绿化屋顶,无论热作用周期的长短,内表面对空气的增温量与太阳辐射照度的变化都呈现很强的正向性。

Thermal insulation characteristics of green roofs in natural state

Measures internal surface temperatures of roofs with and without greening and climate parameters under natural climate in Chongqing summer. Analysing the field test data, obtains following results. The effect of roof greening on reducing the highest temperature on the internal surface is remarkable, the effect on reducing the mean temperature is slightly less notable, but the sum of mean temperature on the internal surface exceeding air mean temperature for green roofs is about 1/4 of that for roofs without greening during hotter days. The air temperature increase for green roofs is greatly reverse to solar irradiance during a day, the reversion is weakened during a period of days alternatively fine and rainy, and the reversion is transformed into a strong positive tropism during all hotter days of a summer. For roofs without greening, the air temperature increase is all strongly positive to solar irradiance during a random period of days.