室内空气环境的数值模拟与通风模式的评估

采用CFD技术对存在隔板及持续释放二氧化碳的污染源的开放式办公室进行了数值模拟,计算分析了两种通风模式下污染物在室内的分布状况以及空气年龄的变化情况,其中空气年龄的计算是利用Fluent软件提供的自定义函数接口技术引入了对应的输运方程来实现。根据模拟结果对开放式办公室内如何选择通风模式提出了建议。结果显示当污染源位置发生变化时,置换型通风模式与混合型通风模式在通风率和换气率的表现上也会发生变化。当室内隔板数目增加的时候,置换型通风模式在房间的整体通风效果上要稍优于混合型通风模式。

Numerical simulation of indoor air environment and evaluation of ventilation modes

In this study, CFD technique was used to simulate the air environment in an open office with internal partitions and contaminant sources which emit carbon dioxide. The contaminant distribution was analyzed under two different ventilation modes. The air age was simulated using a convection -diffusion equation, which is discretized and then solved by using the UDF technology in Fluent 6.1.Some advices are given to the choice of ventilation modes to the open office. The computational results shows that in most cases the displacement ventilation mode behaves better than the mixing ventilation mode when the contaminant source is located in the exhaust zone while the lation modelatter will behave better than the former if the contaminant source is located in the supply zone. And when there are two internal partitions in the room, the displacement ventilation mode behaves better than the mixing ventilation mode in the whole room except in the middle zone.