Mechanical underground car parks
Our goal is to create in underground car parks to a pleasant and healthy atmosphere, which increases both active and passive safety of users (both individuals and emergency services). With smoke and heat extraction systems in parking garages the flue gases are extracted or pushed away with cold air. Ventilation of enclosed car parks is a separate specialty. The building deserves because of its concept (several floors below ground) and its specific use (parking of vehicles) most particularly our attention.
Ventilation mode to meet the specific requirement of our car parks is derived ventilation for enclosed car parks and evolved from our years of experience.
The application of these ventilation is twofold:
1.CO ventilation (daily ventilation coupled with a CO detection)
2.RWA ventilation (controlled smoke and heat evacuation in case of fire linked to a smoke detection) The impulse ventilation system ventilates the closed garage in an optimal way, and because of its concept much more effective and much more efficient than a conventional ventilation (smoke evacuation based on smoke accumulation in smoke compartments).
The ventilation is adjusted to the actual occupancy of the parking lot, and continuously monitors the air quality in all corners of the car park. When vehicles circulate in a closed space, automatically the CO level rise in this space. The proposed impulse ventilation system maintenance air movement in the car parks so that an optimum air quality is assured in the entire garage including all corners. The air inlet and outlet is via structural shafts are mounted in which large axial fans. On the ceiling of each level pulse ventilators are mounted in order to ensure a continuous uniform air movement. The system is coupled to a CO detection station. The plant will switch from its daily ventilation automatically to higher air regimes when the CO concentration in the parking lot rises.
2. RWA ventilation
At vehicle fire in the parking lot produced smoke and heat will be dissipated completely controlled, in advance defined and calculated corridors (smoking areas). Panic is excluded and all evacuation routes that do not remain visible and accessible to these smoking zones piles. The best location of the air inlet and outlet is chosen very carefully in terms of the layout of parking. The air volume and the ideal configuration of the impulse fans can be accurately determined in order to ensure proper operation of the system. The air supply and discharge is done in the same way as in the CO-ventilation, but it is now fully concentrated on the burning zone of the vehicle. All actions are taken in order to create a maximum air flow over the fire to high speed. Only those fans will be activated strictly necessary for the smoke extraction. In air-technical way we create a virtual controlled compartment along which the smoke is fed to the extraction shaft. We retain the full height of the parking level as smoke level so that intervention by the fire brigade is possible the burning vehicle. An addressable fire detection system is indispensable. The smoke evacuation system meets the standard NBN S 21-208-2.
The impulse ventilation system has many advantages in terms of design and management of the car park, compared to conventional ventilation with smoke evacuation in case of fire based on smoke accumulation in smoke compartments.
The advantages of the ventilation system are:
• a better mixing of the ventilation air with the contaminated air, so that lower concentrations of contaminants in the mixed air are present.
• better ventilation in all parts and corners of the garage by induction action of the impulse fans.
• no ducting system required: more space-profit
Benefits to users include:
• A safe evacuation of customers is assured.
• Permanent access to the entire car park (of the fire) for the organisation and emergency services.
The financial advantages are:
• No smoke compartmentation or architectural structural compartments needed
• no sprinkler system needed
• no structural damage to the building above the fireplace, the huge cooling effect of the large flow rates.