| 摘要: |
| 绿化屋顶因其特有的蒸发作用
而展示出独特的隔热性能，其能力就如
同给建筑增加了被动降温装置一样。本
文用数值模拟的方法来分析土壤水分在
绿化屋顶隔热系统中的作用，比较分析了
间歇灌溉、连续灌溉和不灌溉三种模式
下不同含湿量对屋顶传热的影响。研究得
出：绿化屋顶隔热能力与土壤湿度呈正
相关；采用间歇灌溉，屋顶热流密度对土
壤湿度反应更敏感，在土壤含湿量不超
过0.2时，随着湿度的增大，热流显著降
低，在含湿量超过0.3后，热流反应较为
迟钝；采用连续灌溉，屋顶的隔热性能较
间歇灌溉提高3-4倍。 |
| 关键词: 绿化屋顶 隔热特性 含湿量 数值模拟 |
| DOI： |
| 分类号: |
| 基金项目:“十二五”国家科技支撑计划课题资助
项目（2013BAJ11B04） |
|
| Numerical Evaluation of Influence of Soil Moisture on the Thermal Insulation of Green Roof |
|
YANG Zhenjing,TIAN Hanyuan
|
| Abstract: |
| Green roofs, with special evaporation and good insulation performance, have
the same capacity as passive cooling device of architecture. In this paper, the role of soil
moisture in the insulation system of green roof was studied by numerical simulation.
A comparison of influences of different moisture on roof heat transferring under three
different modes of irrigation-intermittent irrigation, continuous irrigation and no
irrigation was conducted. It’s concluded that roof heat flux was negatively related to soil
moisture, and the heat flux of roof was more sensitive to soil moisture in intermittent
irrigation mode. When the content of soil moisture was less than 0.2, the heat flux
decreased significantly while the humidity was increasing. When the moisture content
was more than 0.3, the heat flux had a relatively slow reaction. It was in continuous
irrigation mode that the heat insulation performance of roof improved 3-4 times than
the performance in intermittent irrigation. |
| Key words: Green Roof Thermal Insulation Soil Moisture Numerical Simulation |
