|Table of Contents|

Thermal performance simulation and optimal layout of modular green roof(PDF)

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

Issue:
2023年05期
Page:
216-222
Research Field:
建筑学与城市规划
Publishing date:

Info

Title:
Thermal performance simulation and optimal layout of modular green roof
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)
Keywords:
building energy-saving;  roof greening layout;  thermal performance simulation;  modular green roof
PACS:
TU986
DOI:
10.19815/j.jace.2021.12040
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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Last Update: 2023-09-01