Question 1

How is air flow calculated?

Accepted Answer

Air flow Q = A × v, where A is cross-sectional area and v is velocity. Also affected by pressure and temperature.

Question 2

What affects air flow rate?

Accepted Answer

Duct size, velocity, pressure differential, temperature, and air density. HVAC systems design around these factors.

Question 3

How does pipe diameter affect flow rate?

Accepted Answer

Flow rate is proportional to the square of diameter. Doubling pipe diameter quadruples potential flow rate at the same pressure.

Question 4

What's the difference between volume and mass flow rate?

Accepted Answer

Volume flow (gallons/min) ignores fluid density. Mass flow (kg/s) accounts for density, important when density changes with temperature or pressure.

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