Thermal environment test of subway in B area of severe cold zone and discussion on optimization of ventilation in winter

In order to evaluate the thermal environment of subway stations and tunnels in the B area of the severe cold zone, find existing problems, and put forward countermeasures, summer and winter thermal environment tests are carried out on a typical station and its tunnel sections of Harbin Metro Line 1. The results show that the thermal environment parameters in the test station and tunnels basically meet the requirements of national standards for summer cooling, winter cold prevention and CO2concentration control. However, with the increase of passenger flow and number of vehicles in the future, the winter temperature and CO2concentration of the test station and tunnels may exceed the standard. In order to avoid the excessive impact on the temperature of the public area of the station in winter due to the disorderly introduction of outdoor air at entrances and exits, it is suggested to introduce an appropriate amount of outdoor air from the piston air duct to deal with the future winter thermal environment problems. In view of the current poor airtightness and regulation performance of the combined air dampers in the subway piston air ducts, it is suggested to adopt cold-proof combined air dampers that can adjust the winter ventilation volume of the piston air ducts as needed, so as to achieve the purpose of cold protection and air exchange.