Russian AUTOMATED TRAFFIC CONTROL SYSTEMS home Services Projects Solutions Certificates Partners Vacancies Contacts Ventilation and air conditioning Our company has unique experience in the development of complex ventilation systems, such as structures such as motor transport tunnels. The design process takes place in several stages of complex mathematical calculations and modeling, which will ensure the efficient operation of the equipment. Tunnels are horizontal or inclined underground man-made structures of great length and intended for transport purposes. Of course, ventilation equipment is of great importance for the normal operation of the tunnel. Ventilation ensures the operation of a railway or road tunnel in several modes. Mode A - normal - when non-stop traffic is carried out at the maximum permitted speed at an intensity corresponding to rush hour. Mode B - slowed down - in situations where non-stop traffic is carried out at a speed of less than 20 km / h. Mode B - traffic jam - in cases when a vehicle stops with running engines for a period of up to 15 minutes. It is necessary to understand that among the dangers during the operation of tunnels a special place is occupied by the exhaust gases of cars and fires, which determines the features of the design and installation of ventilation systems, as well as equipment. So, for the normal operation of the tunnel (mode A), the maximum permissible concentration (MPC) of carbon monoxide as an indicator of the entire set of exhaust gases in the air of the transport zone of the tunnel should not be higher than that given in Table. 1, and for modes B and C - not higher than the MPC values. There are several ventilation methods. Transverse, or distribution, in which the outside air from the supply air duct is fed into the tunnel through special holes evenly spaced along the length of the tunnel, and is drawn through the same holes located in the exhaust air duct; supply and exhaust openings are staggered. In the semi-transverse method, clean outside air is forced into the tunnel, as in the transverse method, and the spent air passes through the entire tunnel and goes out through the tunnel portals or special ventilation shafts located along the length of the tunnel. The third method is longitudinal, in which the tunnel serves as an air duct through which the air necessary for ventilation of the tunnel passes.