Drtvnl air conditioning system in the form of longitudinal force (mechanical ventilation) flows .sh

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Natural ventilation in buildings of natural ventilation in buildings
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Ventilation caused by piston moving with different water heater speeds of vehicles inside the tunnel air velocity caused by the pressure difference inside the tunnel water heater Grdd.bsth a one-way or two-way traffic of the tunnel as well as the number water heater of cars that pass through the tunnel, Each piston air in the tunnel, there is a possibility that the vehicle moves inside the tunnel effect is similar to a piston inside a long tube. The effect of the pressure difference between the front and rear cars (pressure maxing in front and rear) force make the air inside the tunnel to Move. Through the air flow is generated depends on the following factors: type of vehicle speed aerodynamic characteristics of the geometric characteristics of the tunnel aerodynamic vehicles water heater
Drtvnl air conditioning system in the form of longitudinal force (mechanical ventilation) flows .shdt air flow depends on the extent of contamination and hence increases with increasing length of the tunnel. In this way, you can install a booster fan to accelerate the airflow in the tunnel. Longitudinal ventilation water heater can be done in 3 ways:
Using the longitudinal ventilation fan: The beginning and end of the tunnel by installing a blower fan and sucking air through the tunnel to get moving. This method only works for one-way tunnels and tunnel air is blown in the direction of the piston effect and natural ventilation to help it. The air velocity is constant and the concentration of pollutants in the tunnel at the entrance to the tunnel water heater entrance from zero to maximum at the outlet is changed. Advantages: - reduce aerodynamic resistance and thus reduces the energy consumption due to the use of air to pass all sections of the tunnel. - Lack of space tunnel - no need for a large initial investment - low costs of operation and maintenance
Cons: - The major problem water heater with this approach is that it may be due to changing weather conditions, natural ventilation flows in the opposite direction during mechanical ventilation function. - - Inefficiency in bidirectional tunnel - air speed limits in the tunnel (to avoid causing inconvenience to passengers) between 8 and 10 Mtrdrsanyh
Longitudinal ventilation with the Devil: The way a channel dug in the center tunnel and the fan installed Quotient through the fan air intake, the air entering from the sides of the Channel tunnel exits. In this way, the air velocity in opposite halves of the tunnel. Due to the use of this method of explaining the bidirectional tunnel can be avoided this way.
Longitudinal ventilation using a Jet fan: The procedure to install water heater the jet jet fan in the ceiling of the tunnel, the air in the upper section of the tunnel geometry to flow out and air conditioning water heater Dhym.rvsh perform longitudinal length of one of the most common methods of Tunnel ventilation water heater is. Advantages: - No need to build a fan Qk Ata - Ability to manage water heater energy consumption (can be adjusted according to the amount of traffic off the number of fans. - Compatibility with piston effect caused by moving vehicles - the flexibility to make changes water heater in circumstances Joy. (using jet fans that have the potential to reverse the flow direction of air flow can be managed according to the normal flow direction. - Easy to install
Cross ventilation: The fresh air through a canal across the entire length of the tunnel into the weather back through the network to be sucked back into the channel. Blower and suction channel cross section varies along the tunnel and the tunnel air is usually imported from the ceiling out. If the entry and exit of air to be located diagonally to each other so that the lateral water heater side walls (Literal transverse) is called. water heater Advantages: water heater - uniformly throughout the tunnel ventilated. - The risk of spread of smoke and fire and the focus will be less pollution. - Uniform air pressure in the tunnel
Semi-transverse ventilation, air conditioning semi-transverse, water heater longitudinal and transverse combination of methods. water heater In this way the entire length of the tunnel into the fresh air and polluted air into the conduit throughout the tunnel and on leaving the tunnel is embedded sucked water heater sent, will. The