Tuesday, 26 July 2016

AIR CHANGE RATE EQUATIONS

AIR CHANGE RATE EQUATIONS

AIR CHANGE RATE EQUATIONS

The most generic method used to calculate ventilation air requirements is based on complete changes of air in a structure or room in a given time period. To determine the airflow required to adequately ventilate an area, calculate the Room Volume to be ventilated Width x Length x Height = ft3 (cubic feet) and than calculate the Air Volume requirement by multiplying the Room Volume by the Air Change Rate per hour.

ACH = Cu-ft / min x 60 min/hr / room volume

CFM = ACH x room volume / 60 min/hr

Where

• ACH = Air Change Rate per Hour

• CFM = Air Flow Rate (Cubic Feet per Minute)

• Room volume = Space Volume (Cubic Feet)

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