How to Design a Ducted Ventilation System for Car Parking Areas

Designing a ducted ventilation system for car parking areas is crucial for ensuring proper air quality and safety. This guide will walk you through the steps required to design an effective system.

Step 1: Calculate the Area and Volume

First, determine the area and volume of the car parking space. This information is essential for calculating the required air changes per hour (ACH).

• Area (A): Measure the length and width of the parking area.
• Volume (V): Multiply the area by the height of the space.

Step 2: Determine Required Air Changes Per Hour (ACH)

Air changes per hour (ACH) is a measure of how many times the air within a defined space is replaced in one hour. For car parking areas, different ACH values are required for various modes.

• Normal Mode: Typically 6-10 ACH
• Trickle Mode: Typically 3-5 ACH
• Fire Mode: Typically 10-12 ACH

Step 3: Calculate Exhaust Air Flow Rate

The exhaust air flow rate can be calculated using the volume of the space and the required ACH.

Where:

• Q: Exhaust air flow rate (cubic meters per hour)
• V: Volume of the space (cubic meters)
• ACH: Air changes per hour

Step 4: Determine Fresh Air Supply

The fresh air supply should be balanced with the exhaust air flow rate to maintain air quality. Calculate the fresh air supply for different modes.

• Normal Mode: Typically 80-90% of the exhaust air flow rate
• Trickle Mode: Typically 50-60% of the exhaust air flow rate
• Fire Mode: 100% of the exhaust air flow rate

Step 5: Design Duct Layout

Design the duct layout to ensure even distribution of air throughout the parking area. Consider the following:

• Duct Sizing: Ensure ducts are appropriately sized to handle the calculated air flow rates.
• Duct Routing: Plan the routing to minimize resistance and ensure efficient air flow.
• Diffusers and Grilles: Place these strategically to ensure even air distribution.

Step 6: Select Fans and Control Mechanisms

Choose fans that can handle the required air flow rates for different modes. Implement control mechanisms to switch between modes as needed.

For more information on fan control mechanisms, refer to our Fan Control Mechanisms page.

Step 7: Compliance and Safety Checks

Ensure that the design complies with local building codes and safety regulations. Conduct safety checks to verify that the system operates effectively under all conditions.

Conclusion

Designing a ducted ventilation system for car parking areas involves careful planning and calculation. By following these steps, you can ensure a safe and efficient system. For more details on other types of ventilation systems, visit our Ductless Ventilation System Design page.