|Document ID (ISN)||110784|
|ISSN - Serial title
||0925-7535 - Safety Science
|Convention or series no.
||Ko J.S., Yoon C.H., Yoon S.W., Kim J.
||Determination of the applicable exhaust airflow rate through a ventilation shaft in the case of road tunnel fires
||July 2010, Vol.48, No.6, p.722-728. Illus. 13 ref.
||In this study, a model experiment in a long road tunnel employing a longitudinal ventilation system with a ventilation shaft was carried out during a fire accident, to determine the optimum exhaust airflow rate through the ventilation shaft. The appropriate operation of the shaft fan according to the position of fire was investigated, and the optimum exhaust airflow rate for prevention of smoke spreading through the tunnel was determined based on the entire exhaust of both smoke and airflow generated by fire and jet fan operation, respectively. As a result of using the amount of smoke, the critical air velocity produced by jet fans, the effective cross-sectional area of a tunnel and the correction factor, a formula for exhaust airflow rate was derived. In addition, a correction factor for the thermal expansion caused by heat of a 20 MW fire was determined theoretically and experimentally. It is expected that this study will contribute to plan the shaft operation for the emergency ventilation as well as provide the preliminary data to design the airflow rate of shaft.
||tunnelling; fire; exhaust ventilation
||smoke; airflow measurement; tests on models; mathematical models
||D - Periodical articles
||Heating, ventilation and climate
Safety organization and training
|Broad subject area(s)
||Fires, explosions and major hazards