摘要
建筑表面换热系数是建筑热工与节能及能耗模拟的重要参数。为考察实际建筑表面的热流与换热系数动态变化,提高建筑能耗模拟的准确性,为设计标准提供基础参数数据,采用直接热平衡法,对西安某办公建筑外墙进行现场测试,得到外墙的对流、辐射及总换热热流,并在此基础上获得了表面的对流、辐射和总换热系数。结果表明:测试期间外墙表面辐射换热系数与对流换热系数分别在159~2918 W/(m^2·K)和014~756 W/(m^2·K)之间变化;外墙辐射热流在白天占总热流比例约为85%,夜间约为50%;对低风速的自然风,建议采用最大频率的对流换热系数数值作为设计计算取值。
Heat transfer coefficient of building surface is an important parameter for building thermal engineering,energy saving and energy consumption simulation.In order to investigate the dynamic changes of heat flow and heat transfer coefficient on the actual building surface,to improve the accuracy of building energy consumption simulation,and to provide basic parameter data for codes and standards,the direct heat balance method was adopted in this study.Field tests were carried out on the external walls of an office building in Xi’an,the/radiation and total heat flux of the external walls were obtained.On the basis of experiment,the convection heat transfer coefficient(CHTC),the radiation heat transfer coefficient(RHTC),and total heat transfer coefficient of the surface were obtained.The results indicated that the radiation and convection heat transfer coefficients of the external walls changed from 159 to 2918 W/(m^2·K)and 014 to 756 W/(m^2·K),respectively.The radiation heat flux of the external walls accounted for 85%during the daylight and 50%during the night of the total heat flux.For the natural wind with low wind speed,the value of maximum frequency was suggested to be used as the design value.
作者
朱新荣
邱杨
杨雯
杨轩
刘加平
ZHU Xinrong;QIU Yang;YANG Wen;YANG Xuan;LIU Jiaping(School of Architecture,Xi’an University of Architecture and Technology,Xi’an 710055,China;State Key Laboratory of Green Building in Western China,Xi’an 710055,China)
出处
《工业建筑》
CSCD
北大核心
2020年第7期83-87,150,共6页
Industrial Construction
基金
国家自然科学基金青年科学基金项目(51308435)
陕西省教育厅专项科研项目(18JK0447,18JK0454)。
关键词
换热系数
对流
辐射
热流密度
现场测试
heat transfer coefficient
convective
radiative
heat flux density
field test
