Skip to main content
International Journal of Concrete Structures and Materials

Table 10 Conversion of air flow rate during air tightness test.

From: Wind Resistance Performance Evaluation of Cable-Type Curtain Wall System on Reinforced Concrete High-Rise Buildings

Conversion of air flow under standard test conditions from measured air leakage

Measured air flow

Standard test conditions

W

Air flow under standard test conditions (CFM)

Location

Total (Qt)

Extraneous (Qe)

Net specimen (Qs)

Pressure

Temperature

Air density (Ws)

Fixed area

4.28

2.0

2.28

1013 (hpa)

20.8 (°C)

1.202 (kg/me)

1.212 (kg/me)

2.28

Vent (project window)

5.60

4.28

1.32

1.32

  1. Atmospheric conditions at the location of air flow meter during the test: Atmospheric temperature (T): 21.2 °C, Atmospheric pressure (B): 1023.0 hpa, Relative humidity: 25.2%
  2. Qst = Q (W/Ws)1/2, W = 3.485×10−3 (B/(T + 273)).
  3. Q = airflow at non-standard conditions, Qs = Qt − Qe.
  4. Qst = airflow corrected to standard conditions.
  5. Ws = density of air at reference standard conditions − 1.202 kg/m3 (0.075 lb/ft3).
  6. W = density of air at the test site, kg/m3 (lb/ft3).
  7. B = barometric pressure at test site corrected for temperature, Pa (in.Hg), and
  8. T  = temperature of air at flowmeter, °C.
Back to article page