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Duct sizing balances airflow velocity, pressure drop, and cost. Proper sizing ensures system performance and efficiency.
चरण-दर-चरण मार्गदर्शिका
- 1Use friction loss tables or duct calculators
- 2Recommended velocity: main ducts 4-6 m/s, branches 3-4 m/s
- 3Size ducts for <25 Pa/100m static pressure drop
हल किए गए उदाहरण
इनपुट
CFM 2500, round duct, 0.15 mmWG friction
परिणाम
Diameter ≈ 500 mm for low-loss duct design
Provides good velocity
सामान्य गलतियां जिनसे बचना है
- ✕Using velocity too high (noise and friction)
- ✕Neglecting pressure drop from fittings and dampers
अक्सर पूछे जाने वाले प्रश्न
Why not use smallest possible ducts?
Small ducts have high velocity, high friction loss, and noise. Oversizing slightly saves fan energy.
How does duct insulation affect sizing?
Insulation doesn't affect sizing directly, but better insulation reduces equipment sizing needs.
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