Table 1 Experiment 1: Ventilation estimated using different methods in two identical houses
From: Measuring ventilation in different typologies of rural Gambian houses: a pilot experimental study
Method | Day | Time of recordings | n | House | t | p | |
|---|---|---|---|---|---|---|---|
House 1 Mean ACH m3/h (95% CI) | House 2 Mean ACH m3/h (95% CI) | ||||||
Method A: Fan pressurization (blower door test) | 1 | 02.00 h, 06.00 h, 10.00 h, 14.00 h, 18.00 h and 22.00 h | 5 | 71.6 (69.0, 74.3) | 85.2 (80.6, 89.9) | − 15.2 | <0.001 |
Method B: Artificial CO2 elevation and decay | 1 | 04.00 h, 08.00 h, 12.00 h, 16.00 h, 20.00 h and 00.00 h | 5 | − 33.2 (− 51.6, − 14.8) | − 29.9 (− 47.2, − 12.7) | − 0.421 | 0.695 |
Method C: Natural CO2 elevation and decay* | 2–7 | 09.00–17.00 h | 6 | − 28.0 (− 46.6, − 9.5) | − 20.5 (34.1, − 6.9) | − 1.040 | 0.346 |
Method D: Natural CO2 rise | 2–7 | 21.00–06.00 h | 6 | 14.8 (12.1, 17.5) | 13.2 (12.1, 14.4) | 1.465 | 0.203 |
Method E: Hot wire thermo-anemometer | 2–7 | 21.00–06.00 h | 6 | n/a | n/a | – | – |