Present status and development trend of ventilation and air conditioning system for urban rail transportation

Reviews the development of urban rail transportation and its ventilation and air conditioning system. Analyses the function and characteristics of the system, and existing specific problems. Presents the new systems for solving practical engineering issues in recent years in China. Considers that the technology development should follow the three principles—“safety and health”, “cost-effectiveness and energy efficiency” and “environment-friendliness and good appearance”.