预制轻钢骨架复合保温墙体热桥传热有限元分析

Finite Element Analysis of Thermal Bridge Heat Transfer for Prefabricated Light Steel Frame Composite Insulation Wall

目的研究预制轻钢骨架复合保温墙体外挂式热桥节点的传热,分析保温层厚度对热桥系数的影响。方法通过Therm软件对预制轻钢骨架复合保温墙体热桥部位有限元模拟,再根据软件模拟出的传热系数计算典型外挂式热桥节点的热桥系数,模拟外挂式柱节点保温厚度分别为50 mm、100 mm、150 mm、200 mm的传热及热桥计算。通过与德国被动房研究所模拟的内嵌式柱热桥节点对比,验证模拟的准确性。结果随着保温层厚度增加柱节点的传热系数减小,热桥系数减小,模拟计算后得到内嵌式柱节点热桥系数为0.026 W/(m·K),与德国被动房研究所模拟计算结果相差7%,验证模拟的结果准确可靠。结论预制轻钢骨架复合保温墙体的6种外挂式热桥节点除外墙阴角节点外可满足无热桥设计。

The aim of this paper is to study the heat transfer of external thermal bridge joint of prefabricated light steel frame composite insulation wall,and analyze influence of insulation layer thickness on thermal bridge coefficient.The heat transfer process of typical external thermal bridge joints with insulation thickness of 50 mm,100 mm,150 mm and 200 mm for prefabricated light steel frame composite insulation wall was simulated by thermal software,and then their thermal bridge coefficients and heat transfer coefficients were calculated.The accuracy of the simulation is verified by comparing with that of the embedded column thermal bridge node simulated by German Passive House Research Institute.With the increase of the thickness of insulation layer,the heat transfer coefficient and the thermal bridge coefficient of the column joint decrease.The thermal bridge coefficient of the embedded column joint is 0.026 W/(m·K),which is 7%different from the simulation results of the German Passive House Research Institute.The simulation result is accurate and reliable.The six kinds of thermal bridge joints of prefabricated light steel frame composite thermal insulation wall can meet the requirements of non thermal bridge design except for external wall internal corner joints.