EFFECTIVENESS OF CAR PARKS VENTILATION

The building code in Singapore specifies the number of air changes per hour that a car park area in a building should be provided with and that half the amount of exhaust air should be extracted from a low level. Other than that, a designer is free to locate the extraction points to ventilate the car park. Experience has shown that a poor positioning of the extraction points can cause some part of the car park to be poorly ventilated and the air may even become stagnant there. This study made use of CFD modeling to look into the performance of four different arrangements of the extraction points in a small car park . The average period that the polluted air stayed in the car park and the associated air exchange efficiency was determined. The problems associated with measuring the concentration of contaminants in a car park are highlighted.