EPS板薄抹灰外墙外保温系统热湿耦合传递的数值模拟  

Simulation on Coupled Heat and Moisture Transfer for EPS Plates Thin Plaster External Wall Systems

作　　者：刘建昌 李隆键[1] 申宪文[1] 冯雅 LIU Jianchang LI Longjian SHEN Xianwen FENG Ya(College of Power Engineering, Chongqing University, Chongqing 400030, China China Southwest Architectural Design and Research Institute, Chengdu 610042, China)

机构地区：[1]重庆大学动力工程学院,重庆400030 [2]中国建筑西南设计研究院,成都610042

出　　处：《重庆理工大学学报（自然科学）》2017年第9期90-96,共7页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51268478)

摘　　要：EPS板薄抹灰外墙外保温系统是我国应用最广的一种外保温系统。为了分析该保温系统在哈尔滨地区使用过程中的保温性能和热湿传递变化情况,对其使用过程中的热湿传递进行模拟。考虑墙体内部水分的气、固、液三相相变,建立以温度梯度和体积含湿量为驱动势的热湿耦合传递模型,并对模型进行验证。结果表明:在模拟建筑材料的结融冰过程中,不能忽略气液相变,这样才能更好地模拟出墙体湿度的变化情况;混凝土墙体在使用过程中前3个月的干燥速度最快,之后变缓,冬季干燥速度最慢;在整个墙体结构中,EPS保温板的干燥速度最慢;随着保温系统内部水分减少,其传热系数逐渐降低,而在冬季由于保温层结冰,使得传热系数明显上升。EPS plates thin plaster external wall insulation systems is one of the most widely used systems in our country.In order to analyze the thermal insulation properties and heat and moisture transfer of use process in Harbin,the heat and moisture coupling was simulated.Considering the three-phase moisture in the wall,the mathematical model of coupled heat and moisture transfer usingtemperature and moisture gradient as driving forces was build.The results show that gas-liquid phase transition can＇t be ignored in order to simulate the changes of humidity when mathematical model is built.Drying speed is the fastest in the first three months and then slowed down.The drying speed in winter is slowest.In the whole structure of the wall,the drying rate of EPS board is the slowest.The heat transfer coefficient decreases gradually during the drying process,while it increases obviously due to the freezing of the insulation layer.

关 键 词：多层建筑墙体 三相相变潜热 热湿耦合传递 

分 类 号：TU111.4[建筑科学—建筑理论]