Eastlink tunnels lead the way with ‘ventilation on demand’

EastLink is one of the first toll roads in the world to upgrade its tunnel ventilation system to dynamic ventilation on demand with partial portal emission. This upgrade has slashed the ventilation system’s electricity usage, reduced GHG emissions, and halved the audible noise from the ventilation system.

EastLink is one of the first toll roads in the world to upgrade its tunnel ventilation system to dynamic ventilation on demand with partial portal emission.

EastLink has twin 1.6 km tunnels, with three traffic lanes in each tunnel. The EastLink tunnels protect the environmentally sensitive Mullum Mullum valley above, reaching a maximum depth of 53 metres underground. Up to 115,000 vehicles drive through the EastLink tunnels in a single day.

Up to 115,000 vehicles drive through the EastLink tunnels in a single day.

The original tunnel ventilation system, commissioned when EastLink opened ten years ago, was designed to expel 100% of tunnel air, including pollutants from vehicles’ combustion engines, through two 45 metre high ventilation stacks.

EastLink identified a number of issues with this traditional type of tunnel ventilation system. To address these issues, EastLink upgraded the ten large ventilation fans from fixed speed fully off / fully on operation to much more efficient self-regulating or closed loop variable speed operation.

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