Optimization Method for Twin-Tunnel Complementary Ventilation Design and Its Energy Saving Effect
Table 3
Required air volumes (m3/s).
Design conditions
Short term (2025)
Long term (2033)
Uphill
Downhill
Sum
U/ D
Uphill
Downhill
Sum
U/ D
Pollutants dilution
CO
181.47
176.05
357.52
1.03
300.10
291.13
591.23
1.03
Smoke
377.42
107.1
484.52
3.52
598.18
169.74
767.92
3.52
Fire emergency
188.37
188.37
376.74
1
188.37
188.37
376.74
1
Minimum air exchange
311.65
285.9
597.55
1.09
415.53
381.21
796.74
1.09
Maximum value
377.42
285.9
663.32
1.32
598.18
381.21
979.39
1.57
Note: the item marked with indicates the maximum required air volume for tunnels; “U/D” indicates the required air flow ratio of the uphill and downhill tunnel.
