Hong Kong. A computational fluid dynamics (CFD), steady state computational model of the PTI was used to investigate and
predict the typical pollutant emission pattern for buses. In Hong Kong, the displacement ventilation (DV) scheme is often employed
for the PTI. The numerical simulation investigates the effectiveness of the DV system in removing pollutants from the occupied
zone. An alternative model is proposed where the supply is located at the ceiling and the exhausts are located at the lower part of the
columns. It was found that both systems could adequately ventilate the PTI; however, the ceiling based air supply system is able to
provide improved thermal comfort and indoor air quality (IAQ).
