Journal ArticleDOI
A New Clean Air Delivery Rate Test Applied to Five Portable Indoor Air Cleaners
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In this article, the authors quantify air cleaner particle removal by particle size resolved clean air delivery rates (CADR) by utilizing particle concentration measurements and indoor aerosol modeling, which was applied to five air cleaners designed for household and office use.Abstract:
Air pollution has been recognised as one of the major risk factors for the global burden of disease. In modern society the majority of the exposure occurs indoors where people spend most of their time. Indoor air quality may be improved with portable air cleaners utilizing various cleaning techniques, such as filtration, electrostatic precipitation, and ionization. The objective of this study was to quantify air cleaner particle removal by particle size resolved clean air delivery rates (CADR). This was obtained by utilizing particle concentration measurements and indoor aerosol modeling. Our test protocol was applied to five air cleaners designed for household and office use. For particles with diameters above 100 nm and at the chosen settings, the CADR was around 40 m3/h for an ion generator, around 70 m3/h for an electrostatic precipitator, and ranging from 100 to almost 300 m3/h for the three filter-based air cleaners. Similar performances were obtained for ultrafine particles, except for the ion gene...read more
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Book ChapterDOI
Ventilative Cooling and Air Pollutants
TL;DR: In this article, a numerical analysis of the effect of fine particle pollution (PM2.5) on the NV potential of office buildings in California, Europe and Asia is presented, which shows that a hybrid NV system can reduce the air conditioning and ventilation electricity consumption of a well-designed office building by up to 83% (which can be increased to 93% by the availability of personal comfort systems).
Journal ArticleDOI
Development of a low-pressure loss PM2.5 filter for building natural ventilation
TL;DR: In this article , an innovative low-pressure loss PM2.5 filter channel that can be integrated in building façades is presented, which uses electrostatic precipitation (ESP) to reduce outdoor PM 2.5 ingress into the indoor environment while ensuring low airflow resistance that natural ventilation systems require.
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Single pass wind tunnel testing for recirculating virus aerosol control technologies
Huizhen. Ouyang,Yuechen Qiao,Myung-Cheon Yang,Ian A Marabella,Christopher J. Hogan,Montserrat Torremorell,Bernard A. Olson +6 more
TL;DR: In this article , a single-pass wind tunnel is used to evaluate the performance of bio-aerosol removal and inactivation in recirculating aerosol control technologies, where velocity uniformity and particle uniformity are first monitored across the cross-section of the tunnel.
Journal ArticleDOI
Incremental Evaluation Model for the Analysis of Indoor Air Measurements
Andreas Schmohl,Michael C. Buschhaus,Victor Norrefeldt,Sabine Johann,Andrea Burdack-Freitag,Christian Scherer,Pablo A. Vega Garcia,Christoph Dipl.-Ing. Schwitalla +7 more
TL;DR: In this paper , an incremental evaluation model based on a source term and a total first-order loss coefficient in each segment was developed to analyze indoor particle measurements, which is applicable to enhance the certification of air cleaners.
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Development of air purifier operation guidelines using grey box models for the concentrations of particulate matter in elementary school classrooms
TL;DR: In this article , a grey-box model that uses measured data and physical differential equations to perform the given objective and verifies its accuracy using ASTM D5157 was developed.
References
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