寒冷地区热湿耦合下墙体热桥的模拟研究
Simulation study on thermal bridging of wall in cold regions under the coupled heat and moisture transfer
李会敏 1王海涛 1魏家骅 1李建1
作者信息
- 1. 河南工业大学土木工程学院,河南 郑州 450001
- 折叠
摘要
在寒冷地区气候条件下,通过COMSOL Multiphysics模拟软件建立热湿耦合模型,对钢筋混凝土柱红砖砌体墙所形成柱墙角热桥进行模拟研究.结果表明,湿传递的作用比只有传热作用的墙体内表面温度低,在实际工况下不能忽略湿传递对建筑材料导热系数的影响.由于热桥的影响使围护结构的热通量增加19.6%,热桥的影响区域为距离最不利点0.4 m左右,在相同保温板厚度时,外保温比内保温墙体内表面温度高,保温效果更好.随着保温板厚度的增加,墙体内表温度升高,墙体内表面热通量降低.为了降低冬季房间供暖能耗,可以通过对热桥外保温来解决墙体结露现象.
Abstract
Under cold region climatic conditions,a thermo-humid coupling model is established using the COMSOL Multiphysics simulation software to simulate the thermal bridge at the corner formed by the reinforced concrete column and the red brick masonry wall.The results indicate that the effect of moisture transfer leads to lower internal surface temperatures of the wall compared to when only heat transfer is considered,and the impact of moisture transfer on the thermal conductivity of building materials cannot be neglected under actual working conditions.The influence of thermal bridges increases the heat flux of the enclosure structure by 19.6%,and the area affected by thermal bridges is about 0.4 m away from the most unfavorable point.With the same thickness of insulation board,the internal surface temperature of the wall with external insulation is higher than that with internal insulation,resulting in better insulation effect.As the thickness of the insulation board increases,the internal surface temperature of the wall rises,and the heat flux on the internal surface of the wall decreases.To reduce the heating energy consumption of the room in winter,the condensation phenomenon on the wall can be resolved by external insulation at the thermal bridge locations.
关键词
热湿耦合传递/热桥效应/露点温度/热湿模拟Key words
coupled heat and moisture transfer/thermal bridge effect/dew point temperature/heat and moisture simulation引用本文复制引用
基金项目
河南省科技攻关项目(232102320225)
河南省粮油仓储建筑与安全重点实验室开发课题(2022KF05)
出版年
2024
国家科技期刊平台
NSTL
万方数据