transport hub, underground taxi waiting zone, ventilation system, air change rate, air quality, numerical simulation

With the shortage of design specification for environmental service system of the underground taxi waiting zone (UTWZ) in transport hub, passengers in this area are not satisfied with the poor air quality. Taking the UTWZ in Tianjin Railway Station as an example, develops the mathematical model of the ventilation system by Airpak software. By comparing the test data with the simulation results, the numerical simulation method is proved correct and reliable. Performs a series of computational numerical simulation to investigate and predict the thermal comfort and air quality of the project with different air change rates. Simulation results show that the air change rate can be 8 times per hour based on consideration of 80 percent peak load.