Numerical simulation on influence of air infiltration of platform screen door on air conditioning load of underground railway stations

Taking a standard underground station as the research object, studies the influence of air infiltration of the underground railway PSDs (platform screen doors) on air conditioning load of the station by using the method of theoretical analysis and CFD simulation calculation. Finds that the mixing ratio of the station hall increases with the increase of the volume of air infiltrate into the station from the tunnel through PSDs, and decreases with the increase of the volume of air infiltrate into the tunnel from the station through PSDs. The mixing ratio of the platform decreases with the increase of the volume of air infiltrate into the station from the tunnel through PSDs, and is less affected by the volume of air infiltrate into the tunnel from the station through PSDs. Air infiltration of PSDs has a great impact on air conditioning load, when the tunnel air temperature is taken as 40 ℃ according to the long-term operation, the infiltration load of PSDs is about 37 to 122 kW. Presents the calculation formula and reference value of the mixing ratio for different air infiltration volume of PSDs, which can be used to guide the calculation of air conditioning load.