When selecting the air volume of a ceiling ERV, consider the space requirements, ventilation efficiency, and system resistance. Key points are as follows:
1. Core Method for Air Volume Calculation
Air Change Rate Method (Applicable to common scenarios such as residences and offices)
Calculate the room volume (length × width × height, including ceiling space)
Select the air change rate based on the intended use:
Bedroom/Office: 3-5 air changes/hour
Conference Room/Classroom: 5-8 air changes/hour
Kitchen/Bathroom: 10-15 air changes/hour
Formula: Air Volume (m³/h) = Room Volume × Air Change Rates
Example: A 10m x 5m x 3m office requires 750m³/h of air volume at 5 air changes per hour.
Heat Load Method (Suitable for industrial or high-temperature environments)
Estimate air volume based on 1m³/h for every 2.8-3.5W heat load.
2. Air Volume Selection Considerations
Applicable Area Reference
Common household mechanical ventilation systems:
150m³/h for ≤ 100m²
500m³/h for ≤ 150m²
It is recommended that actual air volume be designed based on a minimum of 2 air changes per hour.
For example, a 100m² space requires ≥ 400m³/h.
External Residual Pressure Matching
Duct resistance will reduce actual air volume. Select equipment marked "Air Volume @ Corresponding External Residual Pressure" (e.g., 350m³/h). h@150Pa)
Domestic buildings recommend a residual pressure ≥ 150Pa to avoid insufficient terminal air volume.
Filtration and energy consumption balance
Multi-layer filters (such as HEPA + activated carbon) increase resistance, so a 10%-20% air volume margin is required.
Excessive air volume may increase noise and energy consumption, so consider the required quietness when selecting.
3. Installation and Maintenance Recommendations
Plan the duct layout in advance: Reduce the number of elbows to reduce resistance and avoid air volume loss.
Intelligent Control Optimization: Models that support automatic air volume adjustment can adapt to different time periods.
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