三种通风方式下的室内气流组织和室内空气品质的数值分析

Numerical analysis of indoor air distribution and indoor air quality on three ventilation patterns

采用雷诺平均的Navier Stokes方程与RNG的κ ε涡粘性湍流模型,针对三种不同通风方案,对内设障碍物、污染源和集中热源的房间内的三维速度场、温度场以及污染物CO2的浓度分布进行了数值模拟分析。给出了污染物的质量组份的对流-扩散方程,介绍了通风效率的概念。通过对三种通风方式的气流组织和室内空气品质的比较得出,置换通风可使室内工作区得到较高的空气品质、较高的热舒适性,并具有较高的通风效率。

In the present paper, the Reynolds averaged NavierStokes equations and the RNG κε turbulence model are used to predict 3D airflow pattern in a room where barrier , pollutant source and centralized heat source are laid out. Three ventilational patterns are discussed. The ventilation efficiency are introduced as well as a convectiondiffusion equation for predicting the local mass fraction of pollutant. The indoor air velocity and temperature fields and the pollutant CO2 concentration distribution are studied numerically. For the three ventilation patterns, it is attained from computational results that the displacement ventilation pattern can make work area achieved the best indoor air quality, thermal comfort and better ventilation efficiency.