摘要
考虑温湿度对墙体材料热湿物性参数的影响,建立以相对湿度和温度为驱动势的墙体热湿耦合传递模型。在变温湿度边界条件下对墙体非稳态热湿耦合传递过程进行分析,计算得到墙体表面温湿度及热流密度,与不考虑传湿情况进行对比分析。结果表明:不考虑吸放湿时墙体内表面温度比考虑吸放湿时变化幅度大,且前者内表面平均温度与后者相差约0.9℃;因墙体内表面吸放湿作用引起的相变潜热约占总壁体传热量的27.5%,在负荷计算中不可忽略。
A dynamic mathematical model for simulating the coupled heat and moisture transfer through walls was proposed with variable material properties. Relative humidity and temperature were chosen as the driving potentials. The temperature and relative humidity and heat flux of wall surface were calculated under varying boundary conditions and compared with those without taking moisture transfer into account. The results show that without and with absorption and desorption processes, the wall interior surface temperature amplitude of the former case is lager than that of the latter, and the average difference temperature of two cases is 0. 9℃. The phase change latent heat caused by absorption and desorption of wall surface takes up 27.5% of the total heat transfer quantity, which can't be neglected.
出处
《土木建筑与环境工程》
CSCD
北大核心
2012年第6期109-114,共6页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金(51178375)
国家自然科学基金创新群体项目(50921005)
关键词
热湿耦合传递
变物性参数
相变潜热
温度
热流
coupled heat and moisture transfer
inconstant physical parameters
phase change latent heat
temperature
heat flux