ASHRAE - OR-10-001
The Design of Natural Ventilation Systems to Control Smoke Movement in Tunnels
|Publication Date:||1 January 2010|
The control of smoke movement in tunnels is of critical importance to the safety of people in a tunnel. Two general approaches are available to designers of these systems. The first is through passive means and the second is through the use of mechanical equipment. The passive systems are often referred to as natural ventilation (NV) systems. The active systems are referred to as mechanical ventilation (MV) systems. NV systems are only used in existing systems and in short tunnels, while MV systems are implemented in the remaining tunnels. There are many practical advantages to using natural ventilation systems and this paper discusses them along with important design elements that help insure a successful design.