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.
References in periodicals archive ?
Through evaluation of parameters such as exhaust and air intake locations, stack height and stack exit velocity, the minimum exhaust ventilation rates required to maintain acceptable air quality levels at the building air intakes can be determined.
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.
The VM A428 turbo diesel produces 197 hp and requires a ventilation rate of 10,500 cfm.