Table 2.
Ventilation rates according to window opening ratio.
| Case | Ventilation strategy |
Measurement results |
Outdoor conditions |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cross- or Single-sided ventilation | Opening ratio | Ventilation rate [ACHb], indoor air velocity [m/s] | South side |
East side |
Wind velocity [m/s] | Wind direction [°] | Temp. difference [°C] | |||||
| Mean | SD | Na | Mean | SD | Na | |||||||
| Base case | – | 0% | ACH | 0.30 | 0.00 | 2 | 0.32 | – | 1 | 0.41 | 0 | 6.20 |
| Case 1–1 | Cross-ventilation | 15% | ACH, m/s |
6.38 0.08 |
1.85 0.03 |
11 – |
6.70 0.10 |
2.57 0.02 |
7 – |
0.70 | 292.5 – |
2.79 – |
| Case 1–2 | 30% | ACH, m/s |
10.53 0.12 |
2.61 0.03 |
18 – |
12.92 0.19 |
5.81 0.04 |
7 – |
1.05 | 0 – |
3.87 – |
|
| Case 1–3 | 100% | ACH, m/s |
22.39 0.24 |
3.98 0.07 |
5 – |
22.60 0.19 |
– – |
1 – |
1.06 | 0 – |
3.28 – |
|
| Case 2–1 | Single-sided ventilation | 15% | ACH, m/s |
2.13 0.05 |
0.23 0.01 |
2 – |
2.81 0.06 |
0.86 0.01 |
3 – |
0.84 | 292.5 – |
3.01 – |
| Case 2–2 | 30% | ACH, m/s |
2.90 0.05 |
0.74 0.02 |
4 – |
3.65 0.07 |
1.20 0.02 |
4 – |
1.12 | 0 – |
3.96 – |
|
Bold emphasizes ACH - the most important value in this table.
a
N: number of measurements.
b
ACH: air changes per hour.