HVAC & Refrigeration

Basic

Duct Air Velocity

Speed of air in a duct from flow rate and cross-section.

Formula

V = \frac{Q}{A}

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Variables

VVelocity (m/s)

QAirflow (m³/s)

ADuct area (m²)

Example

Q=1.2, A=0.3: V = 4 m/s

Did You Know?

Designers keep duct velocity below about 5 m/s in homes to avoid whistling noise.

hvac duct velocity

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More in HVAC & Refrigeration

Sensible Heat Load

Heat needed to change air or water temperature without a phase change.

Latent Heat Load

Heat absorbed or released when moisture condenses or evaporates — the hidden load air conditioners fight.

Coefficient of Performance (Cooling)

Cooling delivered per unit of work input — higher is more efficient.

Energy Efficiency Ratio (EER)

Cooling capacity in BTU/h per watt of power — a common AC rating.

Refrigeration Tons

Cooling capacity in tons, where one ton removes 12,000 BTU/h.

Airflow (Sensible)

Air volume flow needed to carry a sensible heat load (imperial units).