Abstract As for the current ventilation design of highway tunnels, the value of the altitude coefficient is mainly determined by considering CO emissions in tunnels at low attitudes, while a relevant linear extension is adopted to determine the altitude coefficient for tunnels with altitudes above 2 200 m. With the development of automotive technology and an increase of high-altitude highway tunnels in western China, it is necessary to further study the value determination of altitude coefficients considering CO. In this paper, a calculation formula is deduced for altitude coefficients considering CO from various kinds of gasoline vehicles based on field measurements; this formula provides a relatively accurate way to calculate the required air volume for tunnel ventilation. Using a case study as an example, required air volumes and fan powers are calculated using the code-specified altitude coefficient and the modified altitude coefficient considering CO emissions from various kinds of vehicles, with the results showing that the calculated fan power is significantly reduced using the modified coefficient.
Abstract：
As for the current ventilation design of highway tunnels, the value of the altitude coefficient is mainly determined by considering CO emissions in tunnels at low attitudes, while a relevant linear extension is adopted to determine the altitude coefficient for tunnels with altitudes above 2 200 m. With the development of automotive technology and an increase of high-altitude highway tunnels in western China, it is necessary to further study the value determination of altitude coefficients considering CO. In this paper, a calculation formula is deduced for altitude coefficients considering CO from various kinds of gasoline vehicles based on field measurements; this formula provides a relatively accurate way to calculate the required air volume for tunnel ventilation. Using a case study as an example, required air volumes and fan powers are calculated using the code-specified altitude coefficient and the modified altitude coefficient considering CO emissions from various kinds of vehicles, with the results showing that the calculated fan power is significantly reduced using the modified coefficient.
YAN ,
TAO 1,
2 etc
.On Altitude Coefficient Considering CO from Various Kinds of Vehicles in Highway Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(3): 8-13
2015, Vol. 52 