TUNNEL VENTILATION CONTROL DEVICE

PURPOSE:To prevent lowering of field of view due to partial rise of concentration of contamina tion by computing necessary ventilating air capacity by way of using measurement data of haze transmittance measuring equipment and carbon monoxide measuring equipment and previously set haze transmittance and carbon monoxide level. CONSTITUTION:Flood lights 41 - 4n, haze measurement equipment 21 - 2n and carbon monoxide measuring equipment 31 - 3n are set up at each specific interval inside a tunnel 1. After each of measurement data is transmitted to an input processing part 6 and sampling is made in sequence, it is processed for smoothing by the unit for several minutes and input to a ventilating air capacity computing part 7. Successively, necessary ventilating air capacity is computed under the table look-up method and from PID algorithm by way of using previous ly set haze transmittance and carbon monoxide level. Additionally, in an output processing part 8, a ventilating fan unit 5 is driven by way of instructing the number of the ventilating fan unit 5 to be operated to a ventilating power board 11 in accordance with the computed result. A lighting control board 12 is instructed to raise illuminance of a flood light 4i on the lee side in the case when increase of blowing air amount is instructed and to fall the illuminance in the case when the blowing air amount decreases. Consequently, it is possible to prevent lowering of field of view due to partial rise of concentration of contamination.