Multi-point access to urban underground road longitudinal ventilation system operation control method

¹ Beijing Key Laboratory of Green Building Environment and Energy Saving Technology, Beijing, China
² School of Architecture and Engineering, North China University of Science and Technology, Beijing, China
³ Beijing Municipal Engineering Design and Research Institute Co., Ltd., Beijing, China

^* Corresponding author: chenchao@bjut.edu.cn

Abstract

While the multi-point access to urban underground roads solve traffic congestion, the pollutants (CO, NOx, etc.) emitted during tunnel travel also pose environmental and health risks to the tunnel drivers and passengers as well as the residents near the tunnel openings. To this end, this study focuses on the environmental safety of urban underground roads with multiple points of entry and exit as the focus of research, based on the law of conservation of mass, fluid dynamics and ventilation engineering theory and simulation of experimental research methods, combined with motor traffic and pollutant (CO, NOx, etc.) emission characteristics, proposed NO concentration prediction model, combined with the urban underground road air flow and ventilation system operating characteristics, the longitudinal distribution law of pollutant concentration along the tunnel is calculated through case analysis, the intelligent control strategy of the ventilation system is proposed. The results show that when the traffic flow reaches 2000veh·h^-1, two fans need to be started, and the power consumption is 50% less than that of the whole fan. It is expected to provide a reference basis for the design and efficient low-carbon operation of ventilation system design for urban underground roads with complex structures.