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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。
In order to obtain the influence of the thermal boundary conditions of the building envelope on the numerical results of natural ventilation in winter, the heat flow and isothermal wall boundary conditions of a residential heating system for residential heating in Lanzhou were studied. Realizable k-ε in FLUENT software Turbulence model, the natural ventilation under different boundary conditions and indoor pollutant concentration field were compared and analyzed. The results show that the isothermal flow and isothermal wall boundary conditions have almost no effect on the determination of the ventilation duration at different time intervals when the same fenestration mode is adopted. The calculation results of the ventilation efficiency under different wall thermal boundary conditions are quite different, The spatial and temporal distribution of pollutants in different rooms is inconsistent. The indoor PMV obtained from isothermal wall temperature is lower than the indoor PMV, and the higher the inlet air temperature, the more significant the impact is.