Ventilation system of road tunnels is expensive and for the passengers safety vital equipment of the tunnel. Airflow in the tunnel is analyzed using fundamental fluid mechanics. Types of ventilation of road tunnels are described. A tunnel system engineer defines optional number of thresholds and then carbon monoxide concentration and opacity threshold values for each threshold. State of pollution is defined as a zone between two thresholds. For each threshold, action (turning on or off groups in each pollution state certain number of groups fans) can be defined as well as number of groups of fans. If action is turning on it will be carried out only when the threshold is crossed from lower to higher pollution state. Also, if the action is off the groups of fans will be turned off only when the threshold is crossed from higher to lower state of pollution. In each pollution state certain number of groups of fans can be turned on or off in predefined period of time. Grafcet is a mathematical graphical tool, drawing its inspiration from Petri's nets and its aim is describing discrete-event systems taking in account sequential behavior and concurrency. Grafcet enables hierarchical structure by using macro-steps and macro-actions. Grafcet is presented and used to describe ventilation control algorithm. Proposed algorithm is rather simple but easy to use. It has been verified in Ucka Tunnel (Croatia) and brief analysis of one day of normal regime operation is given.
Longitudinal ventilation control system in road tunnels
Ablaufsteuerung der Längsrichtungsventilation in Straßentunneln
2003
6 Seiten, 7 Bilder, 1 Tabelle, 4 Quellen
Conference paper
Storage medium
English
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