Study On Thermal Comfort In Transition Season In High-Speed Rail Station In Cold Area

Previous studies on thermal comfort have been mainly conducted in climate chamber,summer and winter in air-conditioned buildings and summer in naturally ventilated buildings,but rarely in transition season(non-air conditioned environment)in air-conditioned buildings.For buildings with large space and high density of people like in high-speed rail station,the thermal comfort of passengers in waiting room in non-air conditioned condition should be a concern.For the study of thermal comfort,it is an important task to establish a thermal comfort prediction model which suitable for evaluating the thermal sensation of the research object.In addition,in the background of the transition season,how to combine the local climatic conditions,the thermal characteristics of the envelope,to make use of reasonable building passive technology to improve the thermal comfort situation of passengers in high-speed railway station building is worth studying the problem.In this paper,the high-speed railway station in the cold area is taken as the object of study,and the thermal environment of the waiting room in the high-speed railway station in the transitional season is investigated in the field study.The thermal comfort of the passenger is obtained by conducting the thermal comfort questionnaire of the waiting passengers.The thermal comfort model for passenger in transition season is built and passive technology to improve the thermal comfort of passengers in cold areas is proposed.The contents of this paper has the following aspects.1)The filed study in the high-speed railway stationFiled studies are carried in Railway Station in spring and fall in cold area.Thermal environmental Parameters including air temperature,air relative humility,globe temperature and air velocity were measured and thermal comfort questionnaire survey for passengers were collected.Clothing and level of activity,thermal sensation vote and thermal preference of the passenger are surveyed.Neutral temperature,acceptable temperature range,preferred temperature were obtained by data analysis.2)Thermal comfort model to evaluate the thermal comfort of the passengerAfter the adaptive analysis of all kinds of thermal comfort models,the model of evaluating the thermal comfort of passengers in the transitional season was obtained by comparing the modified PMV model with the adaptive PMV model and obtained the adaptive coefficient in the spring and fall.The relationship between waiting time and thermal sensation is discussed,and the linear relationship between the waiting time and the adaptive coefficient is obtained.3)Correlative analysis and partial correlation analysis of thermal sensation influencing factors and passenger's thermal sensationIn order to explore the relationship between the thermal sensation influencing factors and the thermal sensation of the passengers in the transitional season,the correlation analysis and partial correlation analysis of the thermal sensation influencing factors and the passenger's thermal sensation were carried out.The results shows that air temperature,wind speed,and air relative humidity are significant factors that affect the thermal sensation for passengers in transitional season.4)Improvement of thermal comfort of passengers in high-speed railway station in transitional seasonBased on the influencing factors of visitors' thermal sensation,this paper puts forward some technical measures to improve the thermal comfort of passengers in the transitional season,and provides guidance for the application of passive technology in high-speed railway station.