Short bi-directional tunnels present a number of tunnel ventilation problems for both airrnquality control, in normal operations and smoke control in the event of a fire. The factrnthat they are seldom fitted with extraction fans causes uncertainty in pollution and smokerncontrol outcomes. In the interests of simplicity and perceived technical risk, activerncontrol has been uncommon in tunnels. This paper presents an active control strategyrnbased on the use of feedback control of jet fans to address these issues. Simulations ofrnthe control system’s response, based on current work on the Terrace Tunnel (Wellington,rnNew Zealand) are presented to demonstrate the features and performance of the system.rnBecause most newer tunnels are unidirectional for safety reasons, the work is relevantrnparticularly to refurbishment of tunnels.
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