粗放型屋顶绿化隔热效果分析

时间:2022-10-14 03:20:45

【前言】粗放型屋顶绿化隔热效果分析由文秘帮小编整理而成,但愿对你的学习工作带来帮助。YANG Zhenjing1,TANG Mingfang1,ZHENG Shukui2 (1.Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China; 2.School of Architecture and Civil Engineerin...

粗放型屋顶绿化隔热效果分析

作者简介:杨真静(1975),女,博士生,主要从事建筑节能与热环境研究,(Email)。

唐鸣放(通信作者),女,教授,博士生导师,(Email)。摘要:以自然通风层的屋顶绿化为研究对象,对有无绿化屋顶内表面温度进行比较,采用实测数据统计分析的方法,以全夏季为研究周期,按不同温度区间分析屋顶内表面温度的分布特性,比较2种状态下屋顶内表面温度的分布频率以及总温度,得到绿化屋顶内表面温度

关键词:屋顶;绿化;表面温度;隔热特性

中图分类号: TU111文献标志码:文章编号:16744764(2012)03012405

Aralysis on Thermal Insulation Characteristics of Extensive Green Roofs

YANG Zhenjing1,TANG Mingfang1,ZHENG Shukui2

(1.Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University,

Chongqing 400045, P. R. China; 2.School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, P. R. China)

Abstract:Through comparison of internal surface temperature (IST) of green roofs with that without green roofs through field measurement and statistics analysis, greenroof under natural convention climate in summer was analyzed. Distribution frequency and sum of IST under the conditions with and without green roofs were investigated by dividing IST into several ranges. It is shown that the frequency of IST lower than 34 ℃ for green roofs was 90%, which was about 1.6 times of that for roofs without green. While the frequency of IST exceeding 34 ℃ for green roofs was 4.6% of that for roofs without green, and the sum of IST exceeding 30 ℃ was about 1/3 of that for roofs without greening. Moreover, the property of thermal insulation of green roofs had strong positive relation with outdoor temperature. The thermal insulation characteristic was better as outdoor temperature grew up.

Key words:roofs; green; surface temperature; thermal insulation characteristic

近年来,屋顶绿化减少能耗增加城市绿量的作用得到了越来越多的认可,屋顶绿化是生态化的建筑节能措施,其绿化层可看作生态化的隔热构件,将大部分的太阳热辐射能转化为土壤植物的蒸腾[1],在不加热周围环境的同时能有效降低顶层房间温度[23];对提高建筑能效和改善室内舒适度有明显的效果[45]。对于屋顶绿化,从其热工性能、节能评价、生态效益等方面国内外都有较多研究。目前有关绿化屋面的热工性能研究主要集中在基于实测的性能研究和以实测为基础的理论模型上,Fang[6]和Liu等[7]采用了实测的方法来评价屋顶绿化的隔热效果;Hodo、Abalo等[8]按照数值模拟提出传热计算模型,计算特定气候条件下各参数对传热的影响;Barrio等[912]建立了绿化屋顶的数学模型,并获得一些绿化层的隔热效果定量评价指标;孟庆林等[1314]确定了常用屋顶绿化植物的辐射参数,并据此提出了屋顶能量平衡模型,用来研究草地型绿化屋顶太阳辐射的能量分配;赵定国等[15]对轻型绿化屋面的植物选择、构造措施、隔热性能进行了实验研究;唐鸣放等[1617]研究了绿化屋面在特定气候条件下的当量热阻及其隔热特性,已获得一些植被层热工性能参数。

目前的屋顶绿化传热特性研究大多是选取一个或几个时间段,基本都是在典型晴热气候、室内空调状态下,缺乏对全夏季晴雨相交下屋顶绿化的隔热进行持续性研究,因为屋顶绿化本身作为建筑隔热构件,其效果是植被层、土层综合作用下的结果,植被会随着气温时盛时衰,土层在晴雨作用下,含湿率会相应随之变化,这些因素对屋顶绿化隔热效果的影响在短时间内无法做出系统的分析。本文对屋顶绿化隔热效果进行全夏季的持续测量,在自然通风状态下比较有无绿化屋顶内表面温度,按照科学统计的方法,分析其温度分布,统计其温度总量。〖=D(〗杨真静,等:粗放型屋顶绿化隔热效果分析〖=〗1实验概况

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