Jet fans for Car parking / basement / Tunnel ventilation.
Jets Fans for Tunnel / Carparking ventilation:
Enclosed or underground car parks are primarily ventilated to remove harmful pollution from vehicle emissions, providing fresh air for patrons. Ventilation is also a requirement in the event of a fire to remove hot smoke, allowing escape and providing access for fire fighters.
Ventilation rates for car parks vary, most being based on either an air change rate, rate per parking space or to dilute pollutants. These are specified in the relevant building regulations. And vary between general (pollution) and emergency (smoke) ventilation.
Traditional car park ventilation systems use extract (sometimes supply) fans in conjunction with ductwork, to distribute air around the car park, providing a common system for both pollution and smoke removal. The positioning of extract points within a system is not always ideal. Fresh air is sometimes exhausted before it has becomes polluted, or conversely it becomes excessively
polluted. This can also result in fresh air being exhausted during emergency operation rather than being distributed throughout the car park.
FlaktWoods innovative car park ventilation system utilizes Jetfoil fan technology together with operation of the main fans, eliminating many of the problems associated with conventional ducted systems.
FlaktWoods system is based around the operation of small Jetfoil fans installed in the ceiling of the car park, positioned throughout to control the distribution of air. They can be used to create a flow of air at both low and high level, effectively using the same air twice, resulting in
a more efficient use of air than associated with traditional systems.
Jetfoil fans act in a similar way to a traditional ducted system, pulling air into the fan inlet (like a grille), and discharging it at a high level towards the extract points (like a duct).
A typical system includes the provision of main extract fans, supply fans (if required), Car Park Jetfoil fans, detection systems for pollution and smoke, CFD analysis, and the main control panel. This enables the system to be designed around the specific requirements of the car park
and ensures the system operates as designed.
The advantages of using Jet fans are as below;
Eliminates need for ducting
Woods car park ventilation system uniquely positions Jetfoil and extract fans to transport contaminated air to extract points, eliminating the need for expensive distribution ductwork (and grilles) within the car park.
Reduced System Resistance
The elimination of ductwork from the car park significantly reduces system resistance. Main fans can therefore, be selected at lower speed reducing absorbed power, running cost and noise levels.
Reduces obstructions within the car park, potentially increasing space for parking/building rental and making the installation of other services easier.
Reduced design Time
As there are no complicated duct systems to consider, the time required to design the ventilation system is significantly reduced.
Optimised System Design
The effectiveness of the ventilation system is analysed and then optimised using CFD, providing improved operation for the control of pollution and smoke.
Reduced running costs
Monitoring of air quality (pollution levels) means that the ventilation system is only operated on demand, further reducing absorbed power and running costs.
A more detailed approach to the ventilation system based on project specific requirements.