Difference between Natural & Mechanical Ventilation in Tunnel
Tunnel ventilation is a technique, that provides fresh air inside the tunnel and removes dust from the tunnel during and after construction. Following are the 6 differences between natural ventilation and mechanical ventilation in the tunnel.
Natural Ventilation
1. Natural ventilation is achieved by providing shaft at a suitable interval along the alignment of tunnels.
2. Natural ventilation is an economical method.
3. This ventilation is suitable when the tunnel length is short and the diameter is large.
4. This ventilation is not suitable or acceptable for long tunnel lenght.
5. It is preferable when the orientation of the tunnel is along the wind direction.
6. It removes dust and smokes slowly from tunnels.
Mechanical Ventilation
1. Mechanical ventilation is provided by one or more electric fans or blowers.
2. This method is costlier as they require the installation of numerous fans or blowers.
3. This method is suitable for any size of tunnel, but it is most preferable in the case of a long length of tunnel with a short diameter.
4. This method is suitable for long-length tunnels.
5. This method does not depend on wind direction.
6. This method can quickly remove dust and smoke from the tunnels.
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