Simulation Analysis on Ventilation and Air Conditioning System in Beijing Subway

This paper aimed at the ventilation and air conditioning system for subway of two typical design sections in Beijing subway line 4 that is being built.By using the software of SES and the mathematical model,simulation analysis of two feasible ventilation and air conditioning procedures under the normal condition was presented.Also,the heat output and the influence of train run status,piston-action ventilation shaft,different mode of ventilation and air conditioning system for station tunnel on airflow field,temperature distributions and fresh air requirement of subway were investigated.In addition,the characteristics of this two feasible procedures were compared with respect to the technical and economical aspects.This paper would be helpful for the environmental control system of subway.It will also provide valuable data for the choice of preferred plan,rational design and scientific running management of relative systems.