摘要
对构件式与单元式玻璃幕墙进行了不同断热长度与不同断热形式下的二维传热有限元计算,分别获得了构件式玻璃幕墙在5种不同断热形式与7种不同断热长度下的幕墙节点传热系数,以及单元式玻璃幕墙在6种不同断热长度下的幕墙节点传热系数。结果表明:构件式幕墙传热系数随断热条长度增加而降低,降幅随断热条长度增加呈非线性减小趋势,当断热条大于26 mm时,传热系数降幅变缓,断热长度增加可降低室外对流换热系数增加导致传热系数增加的敏感性。单元式幕墙热工性能与断热条长度、环境边界条件的相关趋势与构件式幕墙相似,但比相同断热长度的构件式幕墙传热系数高1.7~1.8倍。在相同环境边界条件时,采用复杂形式断热条,降低了空腔内的空气流动,提升了热工性能。在此基础上,构建了玻璃幕墙传热系数经验模型,考虑了断热构造和环境边界条件共同作用对玻璃幕墙热工性能的影响,与数值试验数据吻合较好,为实际工程幕墙节能设计提供依据。
Two-dimensional heat transfer finite element calculations were carried out under different heat break lengths and different forms of heat breaks for component-type and unit-type glass curtain walls,and the nodal heat transfer coefficients of curtain walls under five different heat break forms and seven different heat break lengths were obtained for component-type curtain walls,and the nodal heat transfer coefficients of curtain walls under six different heat break lengths were obtained for unit-type glass curtain walls,respectively.The results show that:the heat transfer coefficient of the component curtain wall decreases with the increase of the length of the heat break,and its decrease is non-linear with the increase of the length of the heat break,and the decrease of the heat transfer coefficient slows down when the length of the heat break is more than 26 mm;the increase of the length of the heat break reduces the sensitivity of the increase of the heat transfer coefficient due to the increase of the convection heat exchange coefficient in the outdoor area.The correlation trend between the thermal performance of the unit-type curtain wall and the length of heat breaks and environmental boundary conditions is similar to that of the component-type curtain wall,but the heat transfer coefficient of the component-type curtain wall with the same length of heat breaks is 1.7-1.8 times higher than that of the component-type curtain wall with the same length of heat breaks.At the same environmental boundary conditions,the use of complex forms of heat-breaking bars reduces the air flow in the cavity and improves the thermal performance.On this basis,an empirical model of heat transfer coefficient of glass curtain wall was constructed,considering the influence of the joint effect of heat-breaking structure and environmental boundary conditions on the thermal performance of the glass curtain wall,which is in good agreement with the numerical test data,and provides a basis for the energy-saving design of the curtain wall in the actual project.
作者
肖波
徐童淋
陈丽媛
XIAO Bo;XU Tonglin;CHEN Liyuan(Wuhan Lingyun Building Decoration Engineering Co.,Ltd.,Wuhan 430030,China)
出处
《绿色建筑》
2025年第3期103-112,共10页
Green Building
关键词
玻璃幕墙
隔热条
热工性能
传热系数模型
稳态二维热传导
glass curtain wall
heat break lengths
thermal performance
model of heat transfer coefficient
steady state two-dimensional heat conduction
作者简介
第一作者:肖波,硕士研究生,高级工程师,研究方向为钢结构设计、幕墙结构设计及热工,现供职于武汉凌云建筑装饰工程有限公司;通信作者:徐童淋,硕士研究生,工程师,研究方向为幕墙结构设计及热工设计,现供职于武汉凌云建筑装饰工程有限公司。通信地址:湖北省武汉市东西湖区金银湖街道金山大道146号。
