Research on Ventilation System Discharge Capacity Evaluation Based on CFD Simulation

In the room with pollution source, the pollutant discharge efficiency of ventilation system reflects its pollutant discharge capacity, which is determined by the air distribution and the characteristics of pollution source. In this paper, with a ward model was established, CFD technology was used to simulate the concentration distribution of pollutant in the room as the pollution source was in different positions then these concentration distributions of pollutant in the room were taken as initial conditions, the decaying process of pollutant concentration indoor after pollution sources stopped releasing was simulated too. Base on the simulated results, the distribution and the change in the decaying process of relative pollutant discharge efficiency of each point indoor under different conditions was compared. Based on the comparative analysis of the simulation results, the pollution source index was defined, which could be used to evaluate the impact of pollution sources on the discharge efficiency. With this index, the combination of pollution source and air distribution was further discussed to improve the discharge efficiency of ventilation system.