Designing longitudinal ventilation systems in road tunnels involves a set of key principles aimed at maintaining optimal air quality and ensuring the safety of tunnel users and personnel. Longitudinal ventilation systems are commonly used in road tunnels, where fresh air is supplied from one end of the tunnel, while polluted air is extracted from the other end. The main principles behind their design are as follows:
1. Airflow Direction: The fundamental principle of longitudinal ventilation is to establish a unidirectional airflow inside the tunnel, with fresh air being supplied from one end and stale or polluted air being extracted from the opposite end. This ensures that pollutants, such as vehicle emissions and exhaust gases, are effectively carried away from the tunnel and do not accumulate inside.
2. Traffic and Vehicle Characteristics: Designers must consider the traffic volume and vehicle characteristics, including vehicle types, speeds, and emission rates. These factors influence the ventilation system's capacity requirements to efficiently remove pollutants generated by vehicles.
3. Traffic Density: The density of traffic inside the tunnel affects ....
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