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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年05期

页码:

216-222

栏目:

建筑学与城市规划

出版日期:

2023-09-15

文章信息/Info

Title:

Thermal performance simulation and optimal layout of modular green roof

文章编号:

1673-2049(2023)05-0216-07

作者:

骆天庆¹,周婷慧²,刘 东³,杨胜维³

(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)

Author(s):

LUO Tianqing¹, ZHOU Tinghui², LIU Dong³, YANG Shengwei³

(1. College of Architecture and Urban Planning, Tongji University, Shanghai 200092, China; 2.Shanghai Landscape Architecture Design & Research Institute Co., Ltd., Shanghai 200031, China; 3. School of Mechanical Engineering, Tongji University, Shanghai 200092, China)

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

Keywords:

building energy-saving;  roof greening layout;  thermal performance simulation;  modular green roof

分类号:

TU986

DOI:

10.19815/j.jace.2021.12040

文献标志码:

A

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。

Abstract:

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.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-12-15
基金项目:国家自然科学基金项目(52078350)
作者简介:骆天庆(1970-),女,工学博士,副教授,博士生导师,E-mail:luotq@tongji.edu.cn。

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更新日期/Last Update: 2023-09-01