轻钢龙骨复合外墙热工性能模拟与实测对比研究  

A Comparative Study on Thermal Performance Simulation and Measurement of Light Steel Keel Composite Exterior Wall

作　　者：许景峰 段笔馨 王金霞 谢垚 XU Jingfeng;DUAN Bixin;WANG Jinxia;XIE Yao(School of Architecture and Urban Planning,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Chongqing 400045,China;China Construction Technology Group West Co.,Ltd.,Chongqing 401320,China)

机构地区：[1]重庆大学建筑城规学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [3]中建科技集团西部有限公司,重庆401320

出　　处：《建筑节能（中英文）》2024年第10期130-137,共8页Building Energy Efficiency

基　　金：国家重点研发计划资助项目(2021YFC3100300);重庆市技术创新与应用发展专项课题“重庆乡村建筑更新中SIPS围护结构的本土化应用研究”(cstc2020jscx-msxmX0029)。

摘　　要：轻钢龙骨复合外墙由于热桥及多层非均质结构的影响,其传热机理复杂,特别是含空气间层的墙体存在导热、对流、辐射三种热传递方式的耦合效应,其热工性能难以采用传统计算方法进行精确求解。利用有限元软件COMSOL,从基本传热原理出发,对4种不同构造组成的轻钢龙骨复合外墙的热工性能进行多场耦合模拟,并采用防护热箱法对模拟值进行实测验证分析。结果表明:有限元软件COMSOL可以准确可靠地模拟分析出此类复合墙体的热工性能,其模拟值与测试值(偏差在2%以内)具有较高的吻合度;在空气间层内完全填充岩棉类保温材料比50 mm空气间层的保温性能好;粘贴聚乙烯隔热胶带等断热材料可有效改善轻钢龙骨处的热桥效应。Light steel keel composite exterior walls have a complex heat transfer mechanism due to the influence of thermal bridges and multi-layer non-homogeneous structures.In particular,walls containing air layers exhibit coupled effects from the three heat transfer modes of conduction,convection,and radiation,making their thermal performance difficult to accurately determine using traditional computational methods.This paper uses the finite element software COMSOL,starting from the basic principles of heat transfer,to perform multi-field coupled simulations on the thermal performance of four light steel keel composite exterior walls with different configurations,and uses a guarded hot box method to experimentally validate and analyze the simulation results.The results demonstrate that:the finite element software COMSOL can accurately and reliably simulate and analyze the thermal performance of such composite walls,with the simulated values closely agreeing with the tested values(within 2%deviation).Filling the air layer entirely with rock wool insulation outperforms a 50 mm air layer in insulation.Applying polyethylene insulating tape and other insulating materials can effectively mitigate the thermal bridge effect at the light steel keels.

关 键 词：轻钢龙骨复合外墙 热工性能 有限元分析 防护热箱实验 

分 类 号：TU111[建筑科学—建筑理论]