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http://dx.doi.org/10.9711/KTAJ.2018.20.2.305

A study on the ventilation characteristics and design of transverse ventilation system for road tunnel  

Ryu, Ji-Oh (Dept. of Automotive Engineering, Shin-Han University)
Kim, Hyo-Gyu (Jusung G&B Inc.)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.20, no.2, 2018 , pp. 305-315 More about this Journal
Abstract
In this study, the ventilation characteristics and the relationships between the required ventilation flow rate and the ventilation system flow rate was investigated by numerical method for the optimum design of the transverse ventilation and semi-transverse ventilation system in road tunnels. The following results were obtained. In supply exhaust transverse ventilation system, the system supply-exhaust air flow rate is theoretically equal to the difference between the required ventilation flow rate and natural ventilation flow rate. However, it is shown that it increases by about 10% in the analysis results. And, in the case of the longitudinal air flow rate is increased by installed jet fans, ventilation system air flow rate is reduced. However, as the longitudinal air flow rate increases, the concentration of pollutants in the tunnel decreases, so the exhaust effect of pollutants decreases, and the effect of reducing the system air flow rate is decreased. In case of semi-transverse with only air supply, ventilation system air flow rate is equal to required ventilation air flow rate when tunnel inlet velocity is negative, but results is shown it is increased within about 13.3%. Also, it was found that ventilation effect can not be expected even if the jet fans are increased when the tunnel inlet velocity is negative.
Keywords
Transverse ventilation system; Semi-transverse ventilation system; Ventilation system air flow rate; Required ventilation air flow rate;
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