Study On Thermal Comfort And Air Quality Of Xi’an Metro Station

With the process of urbanization and the continuous improvement of living standards,people’s demand for transportation is also increasing rapidly.Urban traffic problems have begun to affect our daily life.Urban rail transit is rapidly welcomed by passengers because of its advantages of good punctuality,safety and convenience,and its large capacity can save road resources on the ground and reduce the environmental pollution caused by fuel.At present,the development of urban rail transit has become one of the important means to solve urban environmental problems and traffic problems in China.At present,China has entered the stage of large-scale urban rail transit construction.Xi’an urban rail transit started late.The first metro line was opened in2011.By January 2019,four metro lines had been opened and operated.In 2018,the daily average passenger flow of Xi’an Metro exceeded 2 million,ranking first in the inland cities in terms of passenger flow intensity.On March 8,2019,Xi’an Metro’s one-day passenger flow reached an all-time high of 3.121 million.At the same time,in the past two years,the haze weather in Beijing,Xi’an,Shanghai and other cities has become more frequent.Some cities with severe haze have recorded more than 200 days of haze weather.In the case of severe air pollution,people give up driving and choose rail transit such as subway,which has increased the passenger volume of underground rail transit.This has to arouse our attention.Based on the investigation of the thermal environment of Xi’an Metro Station,this paper finds and summarizes the possible problems existing in the thermal environment of Xi’an Metro Station,which provides the basis and basis for the study of thermalcomfort of Xi’an Metro Station.Through the pertinent test of the thermal environment of Xi’an Metro station,and the investigation of the thermal comfort feeling of passengers and staff,the problems and influencing factors of the thermal environment of the metro station are found,which provides multiple angles for evaluating the thermal comfort of Xi’an Metro station,and puts forward multi-angle requirements for improving the thermal environment of Xi’an Metro station.By analyzing the results of thermal environment test and thermal comfort investigation,the key problems of thermal comfort in metro stations are identified,and some suggestions for improvement are put forward based on the current situation of thermal environment in Metro lines.By testing the air quality of Xi’an Metro station,the existing problems of indoor air quality of the metro station at this stage are found,and the influencing factors are analyzed according to the present situation of Xi’an Metro station,and feasible solutions are put forward based on the existing problems and influencing factors.Based on the above test,investigation and analysis,this paper puts forward a series of measures to improve thermal comfort of Xi’an Metro station.The thermal comfort of metro station can be improved by increasing the setting temperature of air conditioning in summer at stations with low passenger flow density;at the same time,the requirement of setting air outlet of environmental control is put forward to avoid the long-term working area of workers as far as possible;in winter,the windshield measures are set at the exit of metro station to avoid excessive wind speed at the exit and passage;and in the ventilation system of Metro station,the air purification module is added to effectively improve the metro station room.Internal air quality,etc.