The typical feature of a tunnel ventilation system is the fans installed in the rear gable of a house and an air inlet at the front of the house, or vice versa. This configuration causes the so-called tunnel effect where air flows over the animals at great speed. This air flow creates a cooling breeze.
Why do they put fans in tunnels?
Typically the equipment is used for smoke extraction or control for the time it takes people to evacuate the tunnel under emergency conditions. They are also utilized to control exhaust fumes and to provide standard ventilation when required.
Which method is best for tunnel ventilation?
Combination of blowing in and exhaust system This method is generally considered as the most efficient system for ventilation of tunnels.
How is tunnel ventilation calculated?
The jet generated by the fan pushes the air flow in the tunnel forward. At the same time, the air pressure that can drive the tunnel air flow drops in the rear. The air pollution in the tunnel discharges from the other side of the tunnel to achieve the purpose of tunnel ventilation.
How does tunnel ventilation work?
Tunnel ventilation is a system where exhaust fans are located at one end of the house and two large openings are installed at the opposite end. ... Pumping air out of a house produces a lowered air pressure inside the house. The outside air pressure then forces air into the house through air inlets.
How do you ventilate a tunnel?
Cooling Inside the House A variety of evaporative systems can be used. Evaporative cooling pads alone, or in combination with fogging nozzles, or fogging nozzles alone, are all effective options. Evaporative cooling pads resemble paper air filters and are placed over the large air inlets in a tunnel-ventilated house.
Why fans are installed in tunnels?
Supply fans bring in clear air from the outside, while exhaust fans push dirty air out of the tunnel. ... So then you blow fresh air from behind the people stuck there, so they have fresh air all the time, and the smoke goes down the tunnel out.”Jun 18, 2018
When would you use a ventilation fan?
As the name implies, ventilation fans are used to ventilate a residential or commercial space. This works to bring fresh air from the outside and into the enclosed space. It helps circulate air through the building or home, which prevents individuals from breathing stuffy, less oxygenated air.Jun 19, 2020
Why do tunnels have fans?
Fire inside a tunnel can be particularly dangerous. ... And the darkness and narrowness of the tunnels can make it difficult for firefighting crews to quickly get to the fire. That's where the fans come in. Supply fans bring in clear air from the outside, while exhaust fans push dirty air out of the tunnel.Jun 18, 2018