摘要
本文以上海市共青森林公园某改造的佛甲草绿化屋顶建筑为例,利用Fluent软件建立与实测数据相吻合的稳态和瞬态屋顶绿化传热模型,并以2个模型为基础,分别探讨不同布置形式对绿化屋顶热工性能的影响以及绿化屋顶在动态情况下的传热特点,以此探讨屋顶绿化节能性。模拟结果表明,屋顶绿化的存在使屋顶外表面温度分布差异显著,可带来12.2℃的表面温差;不同布置形式对绿化屋顶热工性能影响巨大,且植被宽度越宽、间距越小对裸屋顶表面温度的影响越明显;在全天24 h的完整周期内,绿化屋顶表面各测点温度存在一定的时间延迟与温度衰减,并且距离植被越近表现越明显;与裸屋顶相比,该绿化屋顶模型植被覆盖率仅为38.9%,却减少了24.73%的传热量。
This paper is mainly devoted to establishing steady as well as transient models of green roof heat transfer procedure using FLUENT software,which takes an existing building as an example. Based on two models,the effects of different layout forms of the green roof and heat transfer characteristics of the green roof under dynamic conditions are discussed to study energy conservation of roof greening. The results show that the existence of roof greening makes the distribution of roof surface＇s temperature different,which can bring 12. 2 ℃ range of surface temperature. Different forms can also have a profound influence on the performance of the green roof,and it is discovered that the wider the green area is,the more obvious the influence of temperature will be. During the whole cycle of 24 hours,there is certain time delay and temperature decay of each measuring point on the green roof surface,and the closer the distance of vegetation is,the more obvious the effect will be. Compared with bare roofs,the vegetation coverage of the green roof model is only 38. 9%,but the heat transfer is reduced by 24. 73%correspondingly.
作者
黄丽君
刘东
骆天庆
周婷慧
HUANG Lijun;LIU Dong;LUO Tianqing;ZHOU Tinghui(School of Mechanical Engineering Tongji University,Shanghai 200092,China;College of Architecture and Urban Planning Tongji University,Shanghai 200092,China)
出处
《建筑科学》
CSCD
北大核心
2018年第8期44-50,共7页
Building Science
基金
高密度人居环境生态与节能教育部重点实验室种子基金项目"存量建筑的简单式模块化屋顶绿化营建"
