室内污染物扩散的通风优化数值模拟

为了减小房屋装修后室内甲醛对人体的危害,了解不同通风方式及通风速度下室内甲醛浓度的分布特征是关键。本文采用CFD方法,模拟2种基本通风方式室内气流组织的流动形式,研究了不同通风方式、不同送风速度对室内甲醛的浓度分布的影响,数值模拟表明:与异侧送回风通风方式相比,同侧送回风形式更能有效减小室内甲醛的浓度,因而室内通风方式应优先选择同侧送回风。在同侧送回风气流组织形式下,送风速度过小或过大均致使人站或坐高度平面上甲醛浓度增大,因而应根据甲醛的散发强度,选择合适的送风速度,如在本文中送风速度以2m/s左右为宜。优化室内污染物扩散的通风形式,对室内通风设计和气流组织的研究具有一定的指导意义。

Numerical Simulation of Indoor Pollutant Diffusion on Ventilation Optimization

In order to reduce indoor formaldehyde harm on the human body decoration,it is the key to understand the distribution characteristics of indoor formaldehyde concentration in different ventilation mode and Ventilation velocity. The CFD method is applied to simulate indoor air flow organization on two basic ventilation mode,the effects of indoor formaldehyde concentration distribution is studied with different ventilation mode and different air velocity,numerical simulation results show that compared with the ventilation whose air blowing from air inlet and return outlets on the opposite wall,indoor formaldehyde concentration can be effectively reduced with the ventilation whose supply openings and return outlets on the same wall,which should be the preferred option on the indoor ventilation. On the same side of supplying and returning air,too small or too large air velocity both causes the formaldehyde concentration increasing at the height of people standing or sitting,so the air speed should be appropriate about 2m / s. The ventilation optimization of indoor contaminant diffusion has certain guiding significance for indoor ventilation design and the airflow organization.