不同壁面边界条件下冬季自然通风数值研究  

Numerical study on the natural ventilation in winter under different wall boundary conditions

作　　者：王烨[1,2] 孙鹏宝 胡文婷[1] 王靖文[1] 

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]兰州交通大学铁道车辆热工教育部重点实验室,甘肃兰州730070

出　　处：《哈尔滨工程大学学报》2016年第11期1606-1612,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51266004;51476073);甘肃省自然科学基金项目(1308RJZA151)

摘　　要：为获得建筑围护结构热边界条件对冬季自然通风数值结果的影响,本文对兰州地区某地板供暖民用住宅围护结构分别实施等热流和等壁温边界条件,采用FLUENT软件中的Realizable k-ε湍流模型,对不同边界条件下的自然通风及室内污染物浓度场进行了对比分析。结果表明:同一开窗方式时,等热流和等壁温边界条件对不同时段的通风时长的确定几乎没有影响;进风温度不同,不同壁面热边界条件下通风效率的计算结果存在较大差异,不同房间内污染物的时空分布变化并不一致;等壁温边界条件所得室内PMV值比等热流所得室内PMV值偏低,进风温度越高,这一影响越显著。To study the influence of thermal boundary conditions of building envelope on the numerical results of natural ventilation in winter, the boundary conditions of the uniform heat flux and the uniform wall temperature are applied for the surrounding structure of a residence applying floor heating in a region of Lanzhou. The realizable k-ε turbulent model in the FLUENT software is adopted to numerically analyze the natural ventilation and the pollutant concentration field. The results show that the ventilation time is barely affected by the wall boundary conditions under the same window-opened situation. However, the numerical results of the ventilation efficiency and the indoor pollutant profile are significantly affected by the wall boundary conditions. The predicted mean vote （ PMV） value of the uniform wall temperature for the same window situation and a different inlet air temperature is lower than that of the uniform heat flux. Moreover, the influence of the wall boundary condition on the PMV value is more significant for the inlet air with a higher temperature.

关 键 词：自然通风 非稳态传热 地板供暖 热边界条件 室内空气质量 通风效率 数值模拟 

分 类 号：TU832[建筑科学—供热、供燃气、通风及空调工程]