墙体热、湿及空气耦合传递非稳态模型及验证
2016-03-03刘向伟陈国杰陈友明
刘向伟 陈国杰 陈友明
摘要:为了更准确地预测墙体内的温湿度分布,研究多孔介质墙体内的热、湿及空气耦合非稳态传递规律,以温度、相对湿度和空气压力为驱动势,考虑热传递、湿传递、空气渗透及其相互作用,建立了建筑多孔介质墙体热、湿及空气耦合传递非稳态模型,并采用有限元方法设计了相应的模拟计算程序.通过对比新建模型模拟结果与国际公认的HAMSTAD标准验证实例,验证了模型的正确性.
关键词:建筑墙体;非稳态;热、空气、湿耦合传递;含湿量;相对湿度
中图分类号:TU111.4 文献标识码:A
Abstract:A coupled heat, air and moisture transfer model, which takes into consideration the heat transfer, moisture transfer and air convection and their coupled effect, was developed to predict the distribution of the temperature and humidity and to investigate the rule of the coupled heat, air and moisture transfer in walls. The temperature, relative humidity and air pressure were chosen as the driving potentials. A program based on the finite element method was developed to calculate the governing equations. And the numerical results of this model were compared with the internationally accepted HAMSTAD benchmarks, and the results agree well with each other.
Key words:building walls; transient; heat, air and moisture transfer; moisture content; relative humidity
建筑墙体多为多孔介质材料,建筑墙体热湿传递研究以多孔介质传热传质学为理论基础.Philip 与Devries[1] (1957年) 和Luikov[2] (1966年) 以温度和含湿量为驱动势,考虑多孔介质内热传递、湿迁移及其相互作用建立了多孔介质热湿耦合传递模型.在Philip与Devries和Luikov模型的基础上Kunzel[3], Kong[4], Chu[5], Abahri[6], Leskovsek[7], Zhong[8], Belarbi[9], Qin[10],李魁山[11]和郭兴国[12]等各自建立了多孔介质材料的热湿耦合传递模型.空气渗透对热湿传递过程的影响在上述研究中均未考虑.
建筑墙体长期暴露在非稳态气候条件下,由于室内外环境存在温度、湿度及空气压力梯度,这将导致墙体内的热传递、湿迁移及空气渗透.建筑墙体热湿耦合传递研究中忽略空气渗透对建筑墙体热湿传递过程的影响将不利于准确地分析建筑墙体内的温度和湿度分布.为了更准确地研究建筑墙体内的热湿耦合传递规律,刘晓燕等[13]建立了建筑墙体热、湿及空气耦合传递模……
