Application Of Piston Wind In Tunnel Of Guangzhou Metro Station

Metro develops rapidly in China because of its ability to effectively relieve the pressure of urban traffic.However,the energy consumption of ventilation and air conditioning is still high.In recent years,in order to solve the problem of Metro energy consumption,a new type of system – platform screen door system with controllable vents has been favored.This system can close the louver vent in the air conditioning period,prevent the heat from the tunnel entering the platform,thus reducing the energy consumption of air conditioning in the air conditioning period;while in the non-air conditioning period,the louver vent is opened to take away the heat in the station through the action of train piston air,thus reducing the energy consumption of mechanical ventilation.The study of is paper takes a station of Guangzhou Metro as an example to analyze and demonstrate the feasibility and energy saving effect of the platform screen door system with controllable vents in Guangzhou.Based on the long-term monitoring of Guangzhou Metro Tunnel,a large number of measured data are obtained,and the influence law of temperature field and velocity field in a single cycle of train operation is analyzed by data analysis,which provides input data for CFD simulation.Moreover,the data are analyzed hourly and monthly,and it is determined that the tunnel temperature field is greatly affected by the outdoor temperature and the interval between two trains,and the speed field is greatly affected by the interval between two trains.In this paper,the computational fluid dynamics(CFD)method is used to simulate the thermal environmentof metropublic area.According to the simulation,the velocity field and temperature field distribution in the public area of metro are determined,and the piston wind ventilation capacity can basically meet the ventilation demand of 5 times per hour.In the transition season and winter,this paper presents an Operation Scheme of Ventilation and Air Conditioning Systemforplatform screen door system with controllable vents.According to the changes of outdoor temperature and station load,there are four operation modes.The energy consumption simulation of the platform screen door system with controllable vents scheme and the normalplatform screen door system scheme shows that the platform screen door system with controllable vents scheme has better energy-saving effect.This study provides a theoretical basis andTest planfor the engineering application of theplatform screen door system with controllable vents in Guangzhou Metro.