双层通风斜屋面动态热特性模拟分析  

Simulation Analysis of the Dynamic Thermal Characteristics of a Double-skin Ventilated Roof

作　　者：柳晟 严天 徐新华[1] LIU Sheng;YAN Tian;XU Xinhua(Department of Building Environment and Energy Engineering,Huazhong University of Science and Technology,Wuhan 430014,China)

机构地区：[1]华中科技大学环境科学与工程学院,武汉430074

出　　处：《建筑科学》2021年第10期117-121,160,共6页Building Science

基　　金：国家自然科学基金资助项目“自力式能量迁移的套管封装相变墙体系统主动隔热机制研究”(51678263)。

摘　　要：本文介绍了双层通风斜屋面的隔热原理,分析了其传热过程,建立了其动态传热数值模型并进行动态特性模拟。采用模拟结果比较分析了双层通风屋面与普通屋面的热特性。结果表明,典型计算日通过双层屋面的最大热流较普通屋顶降低了约34.5%,日透过热量降低35.4%。本文进一步模拟研究了双层通风斜屋面的空腔宽度、隔热层厚度、倾角等对其动态特性的影响。结果表明,增大隔热层厚度和增加倾角可明显提高双层屋面的隔热性能,而增大空腔宽度虽然可以增强空腔内的对流换热,减少屋面传热,但是当宽度超过6 cm时,再增加空腔宽度对屋面传热量的减少效果甚微。This paper introduces the heat insulation principle of a double-skin ventilated roof,and the heat transfer process is presented.The numerical heat transfer model is established to simulate the dynamic thermal characteristics.Based on the simulated results,the thermal performances of this double-skin ventilated roof are studied,and the comparative analysis with an ordinary roof is also presented.According to the results,the maximum heat flow through the double-skin roof on a typical day and heat transfer per day can be reduced by about34.5%and 35.4%,respectively compared with the ordinary roof.Furthermore,the influence of cavity width,insulation thickness and inclination angle on the dynamic thermal characteristics of this ventilated roof are simulated and studied.The results indicate that increasing the thickness of insulation layer and inclination angle can significantly improve the thermal insulation performance of double-skin roof.Increasing the cavity width can enhance the convective heat exchange in the cavity and reduce the heat transfer through the roof.But when the width is more than 6 cm,the cavity width has a slight influence on the reduction of heat transfer through the roof.

关 键 词：双层通风斜屋面 空腔宽度 隔热 动态热特性 

分 类 号：TU111.19[建筑科学—建筑理论]