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Duct sizing balances airflow velocity, pressure drop, and cost. Proper sizing ensures system performance and efficiency.
Guia passo a passo
- 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
Exemplos resolvidos
Entrada
CFM 2500, round duct, 0.15 mmWG friction
Resultado
Diameter ≈ 500 mm for low-loss duct design
Provides good velocity
Erros comuns a evitar
- ✕Using velocity too high (noise and friction)
- ✕Neglecting pressure drop from fittings and dampers
Perguntas frequentes
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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