Paano Kalkulahin si Duct Sizing
Ano ang Duct Sizing?
Duct sizing balances airflow velocity, pressure drop, and cost. Proper sizing ensures system performance and efficiency.
Step-by-Step na Gabay
- 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
Mga Nalutas na Halimbawa
Input
CFM 2500, round duct, 0.15 mmWG friction
Resulta
Diameter ≈ 500 mm for low-loss duct design
Provides good velocity
Mga Karaniwang Mali na Dapat Iwasan
- ✕Using velocity too high (noise and friction)
- ✕Neglecting pressure drop from fittings and dampers
Mga madalas itanong
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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