Study on heat fluxes of green roofs based on an improved heat and mass transfer model

被引：24
|
作者：
Tian, Yudi [1 ,2 ]
Bai, Xuelian [1 ,2 ]
Qi, Ben [3 ]
Sun, Lexiang [4 ]
机构：
[1] Chongqing Univ, Minist Educ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Chongqing 400045, Peoples R China
[2] Chongqing Univ, Natl Ctr Int Res Low Carbon & Green Bldg, Chongqing 400045, Peoples R China
[3] CMCU Engn Co Led, Chongqing 400045, Peoples R China
[4] China Southwest Architectural Design & Res Inst C, Chengdu 600000, Sichuan, Peoples R China
来源：
ENERGY AND BUILDINGS | 2017年 / 152卷
关键词：
Green roof; Heat flux; Thermal performance; Heat and mass transfer; ENERGY PERFORMANCE; VALIDATION; VEGETATION; CLIMATE; US;
D O I：
10.1016/j.enbuild.2017.07.021
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Analyzing heat fluxes of plants and soil is necessary to explore the thermal performance of green roofs. This paper presents mathematical expressions of heat fluxes of green roofs, and specially a heat and mass transfer model is built to get the distribution of temperature and moisture content in soil. The developed model is validated with experimental data from the intensive planted roof located in Chongqing. And the effectiveness of the model for predicting the temperature and water content variations are demonstrated by the comparison between the experimental results and simulation. Furthermore, the performance of green roof during summer in Chongqing is discussed based on the experiment. Through analyzing heat fluxes of green roofs, the study presents the contribution of each thermal behavior including reflection, convection, evapotranspiration and thermal storage to the thermal effects of the green roof quantitatively. The weight of various thermal behaviors of the green roof changes in different time, resulting in different thermal performance of green roofs. The study of the transient heat fluxes of green roofs will not only contribute to a high efficient usage but also a better application of engineering. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：175 / 184
页数：10
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