Ventilation rate


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Ventilation rate

The rate at which indoor air enters and leaves a building. Expressed as the number of changes of outdoor air per unit of time: air changes per hour, or the rate at which a volume of outdoor air enters in cubic feet per minute.
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References in periodicals archive ?
According to the National Building Code of Finland Section D2 (2012), ventilation rate should be [greater than or equal to] 6 l/s person (13 cfm/person) in office rooms and [greater than or equal to] 8 l/s person (17 cfm/person) in meeting rooms.
1) Maintain building ventilation rates at or above the minimum rates specified in current codes and standards.
ASHRAE Standard 62.1--2013 contains two alternative procedures to determine mechanical ventilation rates:
To this effect, the data were clustered in four blocks according to ventilation rate (V1-V2-V3-V4).
(9) ASHRAE Standard 62.1-2013 requires a minimum classroom ventilation rate of 15 cfm (7 L/s) (totaled from 10 cfm/student [4.7 L/s per student] and 0.12 cfm/[ft.sup.2] [0.61 L/s x [m.sup.2]]), (2) and an ambient air carbon dioxide concentration level of 400 ppm was assumed for this calculation.
Figures 2 through 4 show that, with an increase in environmental temperature, humidity, and ventilation rate, in a double exponential decay model, the parameters for fast and slow initial transmission rates, [E.sub.01] and [E.sub.02], and attenuation constants, [k.sub.01] and [k.sub.02], would increase when the other experimental conditions remain unchanged.
The larger amount of energy stored and discharged by the solar chimney and consequently a higher ventilation rate is achieved.
The ventilation rate in the building was established, operating a variable number of fans for a certain time.