Periodically reversible supply/exhaust ventilation strategy

A Periodically REversible Supply/Exhaust Ventilation (PRESEV) strategy was developed. The potential advantage of the PRESEV strategy was demonstrated by carpark ventilation in reducing ventilation flow rate requirement and at the same time satisfying the time-averaged local CO concentration criteria. It was shown that compared to conventional piston or mixed ventilation, around 30% reduction in the ventilation flow rate may be achievable with the PRESEV strategy. The PRESEV strategy may be applicable to some ventilation system designs for pollutant exposure controls where the averaged local pollutant concentration is the main concern.