Air Flow Distribution For The Transverse Ventilation Systems Of The Reconstructed Side-platform Subway Station

A good ventilation design of the subway station can reduce the investment and energy consumption , produce a safe and comfortable boarding environment, then the subway system will be built and operated in a more efficient way.The ventilation system of air condition of the original circuit demand reconstruction for the current subway No.1 line of Tianjin,but the air supply mode is restricted by the low platform highness.All of the newly-built investment will be huge if the original subway circuit abandoned. Aim at this problem , You professor research group of Tianjin University put forward the organized transverse ventilation scheme.Focusing on the evaluation and optimization of the ventilation of the Side-Platform Station reconstruction of Tianjin Metro, this study establish three dimension model of the ventilation Design at the typical southwest station with the Standard turbulence k ?εModel by using CFD techniques.Through the simulation results we can see that the transverse ventilation design scheme supply air equably to different station fields,the temperature field, the speed field is very even and equilibrium.Based on the original plan of the system ,the study give the program with adding local exhaust to remove the condensation heat,simulations show that the local exhaust system can take a better environment.The air flow organization of the south-west station has been tested in the summer and winter stages respectively after the tianjin metro no 1 trial business.Based on the compare the tested rating air volume in summer with the simulation results,we found that the horizontal ventilation scheme prevent the heat diffuse caused by the tunnel piston wind and the train.The passengers have well thermal comfort. Secondly ,through the analysis of the air flow data at 80% load condition in summer , experimental study show that it is feasible to use the VAV system .The data acquired from the air flow organization test indicate that The natural ventilation can satisfy the passergers thermal comfort so it is feasible and energy conservation to achieve fresh air request using piston wind without machine at the metro initial stages. The study results show that:the transverse ventilation air conditioning scheme of Side-Platform Station reconstruction of tianjin metro is reasonable.the air flow obtain the request of criterion , the space of the website is employed effectively, and the purpose of the economical investment is reached.