Development of outdoor pollution free zone by fan-assisted devices

ABSTRACT Vertical City Air Purification System was designed to reduce the aerosol counts at the playground next to a major traffic road. Columns with air grilles are arranged in circle to create a close loop system. Computational simulation is adopted to study three scenarios. The first simulation covers conventional wind block technology, where strong wind speed is created between columns to stop pollutants from entering the premise. However, it is observed that polluted air can enter the development from the head above. Hence, two other options are created, one with supply air directing to the centre of the development, the other with underfloor air supply. It is studied that at outlet velocity of 6.5 m/s, the underfloor system can contribute to around 40% pollution reduction using MERV13 filter, which is more than 24% better than the baseline. Traditionally, outdoor pollution mitigation deems to be contributing insignificantly. The positive simulation result marks a potential for future outdoor pollution mitigation development.