2004 Volume 29 Issue 93 Pages 49-56
In underground car parks, vehicles emit exhaust gases including carbon monoxide (hereafter CO) etc. The underground car parks are usually mechanically ventilated because they are enclosed with walls, etc. and there are not enough effective openings for natural ventilation. In such large enclosures containing contaminant sources, it is important to supply fresh air for the occupied zone and to remove polluted air efficiently. In this paper, the acceptable concentration of CO and required ventilation rate for a car park in Japan were compared to those in other countries. The pollutant emission rate from vehicles was decreased by recent emission regulations. The CO emission volume was estimated by the amount of time vehicles traveled according to the sizes of car parks and the frequency of entering/exiting vehicles. The procedure to estimate the CO emission volume and the required ventilation rate was demonstrated with several charts.
