The minimum fresh air requirement of a residential building is specified to be 0.35 air change per hour (per ASHRAE standards). That is, 35% of the entire quantity of air contained in a residence should be replaced by fresh outdoor air every hour. The ventilation requirement of a 3-meter highresidence with 150 square meters of floor space is to be met by air provided by a single fan.a. Determine the required flow capacity of the fan (in m3/min).b. Find the diameter of the fan duct required (circular cross-section) if the average air velocity from the duct is to be 3 m/sec.

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Asked Oct 23, 2019
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The minimum fresh air requirement of a residential building is specified to be 0.35 air change per hour (per ASHRAE standards). That is, 35% of the entire quantity of air contained in a residence should be replaced by fresh outdoor air every hour. The ventilation requirement of a 3-meter high
residence with 150 square meters of floor space is to be met by air provided by a single fan.
a. Determine the required flow capacity of the fan (in m3
/min).
b. Find the diameter of the fan duct required (circular cross-section) if the average air velocity from the duct is to be 3 m/sec.

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3m x 150 m2 V = 450 m3 Calculate the flow capacity: 0.35x 450 m3 min 60 -2.625 m3 /min Thus, the minimum flow rate is 2.625 m' /min .

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