Study On Ventilation Method In Subway Station Strack Area With Screen Door In Severe Cold District

As a representative city in cold region of China,Harbin has the characteristics of short-cool summers and long-cold winters.This paper makes a detailed analysis on the meteorological conditions in Harbin.Found that even introducing the hotter air during the operating period to the subway station tunnel,there are still cooling heat rejection effect.Considering of the Meteorological parameter of Harbin and the construction condition of structural duct in track area,the heat-extraction system of subway station in cold area could be canceled.The piston wind caused by trains can exhaust the heat of track area independently.Then,according to the unsteady Bernoulli equation,the piston wind of the subway tunnel is deduced.According to the requirement of the design code,the assumption of the train’s trafficl control scheme is assumed.The function of heat dissipation of the train that varies with time in each stage of the tunnel is calculated by Process Method.The paper creats a heat transfer model of the soil around the tunnel through the method of numerical to simulate the heat transfer process of the soil.Ultimately we can determine the stable temperature of the tunnel in summer hottest temperature.When the average temperature is 24.2 degrees centigrade,the stable temperature in the tunnel is 29.2 degrees centigrade,and the average temperature is 29.1 in the month,the temperature is 32.2 degrees centigrade in the tunnel.Finally,we establish a physical model track area to simulate the temperature field.using the previously calculated good piston wind function and rail line area heat function to program UDF function,setting the boundary conditions.The calculation results show that the piston wind generated by the piston effect of the train can be used to exhaust heat of track area.