Performance characteristics of a fan filter unit (FFU) in mitigating particulate matter levels in a naturally ventilated classroom during haze conditions
| Autor: | Ganesh K. Parshetti, Chandra Sekhar, Kwok Wai Tham, Prashant Anand, David Cheong |
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| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Haze 010504 meteorology & atmospheric sciences Particle number 010501 environmental sciences 01 natural sciences Indoor air quality Cabin pressurization Humans Air Conditioning Particle Size 0105 earth and related environmental sciences Air Pollutants Schools Moisture Public Health Environmental and Occupational Health Environmental engineering Building and Construction Models Theoretical Particulates Infiltration (HVAC) Air Pollution Indoor Housing Environmental science Particulate Matter Facade Environmental Monitoring |
| Zdroj: | Indoor Air. 31:795-806 |
| ISSN: | 1600-0668 0905-6947 |
| DOI: | 10.1111/ina.12771 |
| Popis: | The performance of a low-cost fan filter unit (FFU) in mitigating hazardous particulate matter (PM) levels in a naturally ventilated school classroom is presented. The FFU can be considered as a simplified mechanical ventilation and air-conditioning system without heating and cooling functions. The FFU improves indoor air quality through introduction of cleaned outdoor air to flush out internally generated heat and moisture and reducing infiltration by maintaining indoor pressurization. Indoor particle number concentrations were reduced between 85% and 95%. The particle removal performance (PRFFFU ) of the FFU is determined and incorporated into the augmented facade penetration factor (Paug ). A case-specific recursive dynamic mass balance model is used to characterize the infiltration factor (FINF ), deposition rate (K), and the penetration efficiency (Paug ) from continuously monitored indoor and outdoor mass concentration levels. Computed "Paug " (0.07, 0.09, and 0.13) and "FINF " (0.06, 0.08, and 0.11), respectively, for PM10, PM2.5, and PM1 suggest that exposure to PM was significantly reduced indoors. The effectiveness of the FFU for reduced "FINF " and "Paug " may be attributed to its superior filtration, dilution, and exfiltration mechanisms. In comparison with alternative PM mitigation solutions, the FFU is effective, affordable, and sustainable. |
| Databáze: | OpenAIRE |
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