Steady-state simulation study of unidirectional flow ventilation for heat removal in track area of subway stations

To address the issue of uneven wind speeds at various outlets in the existing over-track heat removal system in the actual station track area, which affects the heat removal effect, this paper proposes a scheme of unidirectional flow ventilation for heat removal with air supply on one side and exhaust on the other side. Using CFD numerical simulation, this study compares the temperature field and ventilation heat removal effects under both the new and existing heat removal schemes, assuming continuous heat release from the condenser of stopped trains. The results show that adopting the unidirectional flow ventilation method with air supply on one side and exhaust on the other side can make full use of the advantage of slow attenuation of the air supply jet velocity to improve the heat removal efficiency in the track area. Overall, the new heat removal scheme has outstanding cooling advantages in the middle of the train, and can effectively improve the heat accumulation problem and the thermal environment quality in the track area.