基于COMSOL模拟材料的导热系数与热桥效应的关系

Relationship Between Thermal Conductivity and Thermal Bridge Effect Based on COMSOL Simulation Materials

随着节能建筑化的提出,减少建筑能耗问题显得非常重要。而对建筑热桥的处理则是提高屋面结构节能的关键点。通过对比不同的导热系数对三维传热过程的影响,在保温层的设计上分别选择3种不同的基本材料(导热系数差相近或较大)进行复合。对不同组合方案应用COMSOL软件进行模拟,结果表明,当导热系数差值逐渐增大时,其热桥效应逐渐增大。因此,在今后复合材料的上下层设计中应尽量选择导热系数相差较小的材料。

With the development of energy-saving building,it is very important to reduce building energy consumption.The treatment of the building thermal bridge is the key point to improve the energy saving of roof structure.By comparing the effects of different thermal conductivity on the three-dimensional heat transfer process,three kinds of basic materials(difference in thermal conductivity is similar or large)were selected to compound in the design of the insulation layer.The COMSOL software was used to simulate different combination schemes.The results show that,when the difference of thermal conductivity increases gradually,the thermal bridge effect increases gradually.Therefore,in the design of the upper and lower layers of composite materials,the materials with small thermal conductivity should be chosen as far as possible.