种植屋面热工参数
Thermal parameters of planting roofs
摘要：
针对建筑节能工程应用的需要，研究了种植屋面节能设计热工参数，包括种植土导热系数和植被层附加热阻。采用实验方法测量了6种种植土试样材料在不同湿度下的导热系数，回归分析得到了由干密度和重量湿度确定的种植土导热系数计算式，提出了2类常用种植土的导热系数参考值：改良土为0.51 W/（m·K），无机复合种植土为0.25 W/（m·K）。采用现场测量与模拟分析相结合的方法，研究了种植屋面当量热阻与热流的关系，针对不同的植物覆盖状态，提出植被层附加热阻参考值为0.3～0.5 m2·K/W。
Abstract：
In order to meet the needs of building energy conservation application projects, studies the thermal parameters of the energy saving design of a planting roof, including the soil thermal conductivity and the additional thermal resistance of the vegetation layer. Measures the thermal conductivity of six kinds of soil sample materials at different humidity, and obtains a formula for calculating the soil thermal conductivity by regression analysis. Proposes two kinds of common reference values of thermal conductivity which are 0.51 W/（m·K）for improved soil and 0.25 W/（m·K）for inorganic compound soil. Based on the field measurement and simulation analysis of planting roof, studies the relationship between the equivalent thermal resistance and the heat flux. According to the different status of vegetation coverage, proposes that the reference value of additional thermal resistance of vegetation layer is 0.3 to 0.5 m2·K/W.
Keywords:planting roof, planting soil, thermal conductivity, vegetation layer, thermal resistance