模块式屋顶绿化热工性能模拟及排布优化  

Thermal performance simulation and optimal layout of modular green roof

作　　者：骆天庆[1] 周婷慧 刘东[3] 杨胜维 LUO Tianqing;ZHOU Tinghui;LIU Dong;YANG Shengwei(College of Architecture and Urban Planning,Tongji University,Shanghai 200092,China;Shanghai Landscape Architecture Design&Research Institute Co.,Ltd.,Shanghai 200031,China;School of Mechanical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学建筑与城市规划学院,上海200092 [2]上海市园林设计研究总院有限公司,上海200031 [3]同济大学机械与能源工程学院,上海200092

出　　处：《建筑科学与工程学报》2023年第5期216-222,共7页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(52078350)。

摘　　要：以屋顶绿化为削减上海夏季空调高能耗的重要手段,探究其在不同建设布局下的节能效益差异,以期在推广建设中获得更好的节能实效;首先穷举对应不同屋面绿化率的模块排布单元,然后在FLUENT软件中借助经实测校准的佛甲草屋顶绿化模块传热模型,模拟不同排布单元的热通量,最终比选节能潜力突出的排布单元,考察低建养成本的排布方式并计算其导热系数。结果表明:不同排布单元的热通量存在差异;随着屋面绿化率的增长,相应排布单元的平均热通量显著下降;在屋面绿化率相同的情况下,模块相对集中的排布单元热工性能较佳;屋面绿化率为80%的排布单元较100%绿化单元可降低20%的模块产品价格成本,其导热系数可达0.3 W·m^(-1)·K^(-1),较未绿化单元减少50%;夏季在上海地区屋面绿化率改变对于模块式屋顶绿化的热工性能影响显著;通过小尺度抽象场景模拟可推得具有科学实践引导价值的应用场景,即模块式屋顶绿化在屋面覆盖率达到80%且绿化模块相对集中排布时,具有较好的经济节能效益。Taking green roof as an important measure to reduce the high energy consumption of air conditioning in Shanghai in summer,the differences in energy-saving benefits under different construction layouts were explored to achieve better energy-saving results in promotion and construction.Firstly,the module layout units corresponding to different roof greening rates were enumerated,and then the calibrated heat transfer model of the Sedum roof greening module in FLUENT software was used to simulate the heat flux of different layout units.Finally,the layout unit with outstanding energy-saving potential was selected,the layout method with low construction and maintenance costs was investigated,and its thermal conductivity was calculated.The results show that there are differences in heat flux among different layout units.As the greening rate of the roof increases,the average heat flux of the corresponding layout units significantly decreases.Under the same roof greening rate,the layout units with relatively concentrated modules have better thermal performance.The layout unit with an 80%greening rate on the roof can reduce the cost of module products by 20%compared to the 100%greening unit,and its thermal conductivity can reach 0.3 W·m^(-1)·K^(-1),which is 50%less than that of non greening units.The change in roof greening rate in summer in Shanghai has a significant impact on the thermal performance of modular green roof.Application scenarios with scientific practical guidance value can be derived through small-scale abstract scene simulation.Modular green roof is expected to have good economic and energy-saving benefits when the roof coverage rate reaches 80%and the greening modules are relatively concentrated.

关 键 词：建筑节能 屋面绿化排布 热工性能模拟 模块式屋顶绿化 

分 类 号：TU986[建筑科学—城市规划与设计]