The Simulation On The Temperature Field And Humidity Field Of Subway In Wuhan

With the rapid development of China’s urbanization, the subway constructions have beenflourishing in the major cities. However, the burgeoning subways have given rise to someproblems about subway environment. The subways in Beijing, Hangzhou, Guangzhou haveall suffered too much high temperature and too much humidity in summer when the subway isin operation. Such high temperature and heavy humidity have a dramatic effect on passengers’comfort while they take the subway. In comparison, the subway stations in South of China,like the ones in Wuhan, are more likely to be subject to high temperature and heavy humidityin public areas in summer when the subway is in operation.This paper is aimed at the Sports Center Metro-North Station on Line3of Wuhan. Thestation is an island platform with double-layer, which is divided into station hall part andplatform part. In terms of the actual size of the station, a full-scale three dimensionalgeometrical model is developed. The boundary of the model is defined in the designconditions after the factual heat load and wet load, the Standard Turbulence Model being thephysical model of the station. Then, the theory of CFD was applied to the analog computationon the temperature field and velocity field.In this paper, a ventilation and air conditioning program is first verified to see whether itmeets the design requirements for the distribution of the temperature field and velocity fieldwhen the subway in Wuhan is in operation in summer. Then, a model is selected as the basicmodel, which meets the requirements of the temperature field and velocity field. Finally, theconditions of the boundary humidity are defined and the distribution of the humidity field issimulated.After the scientific analysis of the simulated results of the temperature field, velocityfield and humidity field, the conclusions are reached as the following:First, with the simulated analysis of the ventilation and air conditioning program for thepublic area of a subway station, it is verified that the ventilation and air conditioning programinvolved in the project design meets the requirements of the temperature in the public area ofa subway station.Second, the simulated analysis of the humidity distribution in the public area of asubway station reveals that the existing ventilation and air-conditioning program causes theoverloaded humidity, which is more than70%, in the public area of the subway station in Wuhan in summer with high temperature and heavy humidity. This significantly affects thecomfort of the environment inside the subway station.Last but not the least, a new program is put forward. On the basis of the analysis of thesimulated results of the improved program, it is verified that the control of the humidity levelsin the ventilation and the air-conditioning can reduce the humidity in the public area of asubway station.