Optimization Method for Twin-Tunnel Complementary Ventilation Design and Its Energy Saving Effect

Table 6

Energy savings for ventilation achieved in tunnel operation period with the optimization method.

Tunnel	Period	Design Volume (m^3/s)		Interchange volume (m^3/s)		Total power (kW)		Energy  Saving; (%)	Saving cost; (thousand dollars)
		O.	R.	O.	R.	O.	R.
Dabieshan Tunnel	short-term	368.9	319	0	78	300	150	50	91.25
		278.97	299		56
	long-term	420	432	240	150	2040	855	58.09	720.88
		420	367		202
Lianghekou Tunnel	short-term	450	375	0	186	570	180	68.42	237.25
		300	381		196
	long-term	480	497	380	357	1200	660	45	328.5
		480	462		362

Note: “O.” indicates the original design, and “R.” indicates the redesign.