Air Change Rate

How to calculate air change rates - air change rate equations in imperial and SI units

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air change rate

Air Change Rate - Imperial Units

Air change rate per hour can be expressed in imperial Units as

n = 60 Q / V (1)

where

r = air change rate per hour

Q = fresh air flow through the room (Cubic Feet per Minute (cfm))

V = volume of the room (Cubic Feet)

Air Change Rate - SI Units

Air change rate expressed in SI-units:

n = 3600 Q / V (2)

where

r = air change rate per hour

Q = fresh air flow through the room (m3/s)

V = volume of the room (m3)

Example - Air Change Rate SI Units

With an air flow of 3 m3/s in a 20000 m3 room the air flow rate can be calculated as

n = 3600 3 (m3/s) / 20000 (m3)

= 0.54

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Related Topics

  • Ventilation Systems Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more

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