The current work analyses the dispersion of pollutants in the near-field of a building with a roo... more The current work analyses the dispersion of pollutants in the near-field of a building with a roof exhaust stack for various building configurations. Through computational fluid dynamics (CFD) simulations, geometric parameters of adjacent buildings, such as height, length, width and spacing between buildings were evaluated. The study analyses, in qualitative terms, the impact of those geometric characteristics the risk of pollutant re-ingestion on buildings near the source. The main objective of the study is to suggest safe placement of air intakes on buildings facades in order to avoid or limit pollutant re-ingestion for different building configurations. The criterion for acceptability of safe intake placements was defined as the spatial location where normalized dilution, DN, is at least equal to 6. This value represents the acceptable threshold to avoid odors and occupational health effects for a large group of chemicals. In total, 25 different building configurations were simul...
Advances in Building Energy Research, Dec 28, 2020
Vacuum cleaner is known as a proper way to remove settled dust or aerosols from surfaces to prote... more Vacuum cleaner is known as a proper way to remove settled dust or aerosols from surfaces to protect building occupants against abiotic and biological particles. In fact, the act of vacuuming the su...
Conclusions: For the five blade the pressure was low than 10 Pa during two seconds of simulation ... more Conclusions: For the five blade the pressure was low than 10 Pa during two seconds of simulation in Comsol Multiphysics. This pressure had the good agreement with dust behavior in the air during sucking. With the obtained pressure, dust conserved their mobility diameter during the injection in the diluter. References: 1. Djebara, Wenga, and Songmene, Pollutant Emissions control in the Machine Shops, EHS-02 (2012). 2. Wenga & al, (2012), Numerical study and simulation of dust sampling with dilution, Encyclopedic of research in Aluminium (2012). Figure 2. Domain of Palette suction pump and meshing. Figure 3. 2D and 3D simulation of average velocity field.
Abstract Reducing volatile organic compounds (VOCs) concentrations in built environments is neces... more Abstract Reducing volatile organic compounds (VOCs) concentrations in built environments is necessary to achieve acceptable indoor air quality or comply with workplace regulations. Different air cleaning technologies are applied for the removal of VOCs. Unlike conventional adsorption-based technologies like activated carbons, so-called electronic air cleaning (EAC) technologies generate reactive species directly or indirectly to oxidize VOCs. In this study, dynamic single pass tests were conducted in a test rig consisting of four identical test ducts with individual flow control, allowing simultaneous evaluation of four different air purification systems under identical conditions. Three oxidation-based air-cleaning technologies were considered: photocatalytic oxidation (PCO), non-thermal plasma (NTP), and ozonation (O3). A total of 17 different configurations of EAC systems were tested for acetone and/or methyl ethyl ketone (MEK) removal. These include 12 different commercial PCO units, one in-house pilot PCO, two plasma, and two ozonation units. Sixteen of them were tested for the removal of 0.1 ppm MEK and their single pass removal efficiencies varied from 0 to 37%. Eleven of them were examined for the removal of 0.1 and 1 ppm of acetone and the removal efficiencies were between 0 and 23%. Ozonation and PCO-based system using ozone generating vacuum UV lamps generally showed a higher efficiency than PCO-based system with non-ozone generating UVC lamps or plasma units. Formaldehyde, acetaldehyde, and acetone were detected as the oxidation by-products in MEK testing. PCO-based systems tend to generate more by-products.
The current work analyses the dispersion of pollutants in the near-field of a building with a roo... more The current work analyses the dispersion of pollutants in the near-field of a building with a roof exhaust stack for various building configurations. Through computational fluid dynamics (CFD) simulations, geometric parameters of adjacent buildings, such as height, length, width and spacing between buildings were evaluated. The study analyses, in qualitative terms, the impact of those geometric characteristics the risk of pollutant re-ingestion on buildings near the source. The main objective of the study is to suggest safe placement of air intakes on buildings facades in order to avoid or limit pollutant re-ingestion for different building configurations. The criterion for acceptability of safe intake placements was defined as the spatial location where normalized dilution, DN, is at least equal to 6. This value represents the acceptable threshold to avoid odors and occupational health effects for a large group of chemicals. In total, 25 different building configurations were simul...
Advances in Building Energy Research, Dec 28, 2020
Vacuum cleaner is known as a proper way to remove settled dust or aerosols from surfaces to prote... more Vacuum cleaner is known as a proper way to remove settled dust or aerosols from surfaces to protect building occupants against abiotic and biological particles. In fact, the act of vacuuming the su...
Conclusions: For the five blade the pressure was low than 10 Pa during two seconds of simulation ... more Conclusions: For the five blade the pressure was low than 10 Pa during two seconds of simulation in Comsol Multiphysics. This pressure had the good agreement with dust behavior in the air during sucking. With the obtained pressure, dust conserved their mobility diameter during the injection in the diluter. References: 1. Djebara, Wenga, and Songmene, Pollutant Emissions control in the Machine Shops, EHS-02 (2012). 2. Wenga & al, (2012), Numerical study and simulation of dust sampling with dilution, Encyclopedic of research in Aluminium (2012). Figure 2. Domain of Palette suction pump and meshing. Figure 3. 2D and 3D simulation of average velocity field.
Abstract Reducing volatile organic compounds (VOCs) concentrations in built environments is neces... more Abstract Reducing volatile organic compounds (VOCs) concentrations in built environments is necessary to achieve acceptable indoor air quality or comply with workplace regulations. Different air cleaning technologies are applied for the removal of VOCs. Unlike conventional adsorption-based technologies like activated carbons, so-called electronic air cleaning (EAC) technologies generate reactive species directly or indirectly to oxidize VOCs. In this study, dynamic single pass tests were conducted in a test rig consisting of four identical test ducts with individual flow control, allowing simultaneous evaluation of four different air purification systems under identical conditions. Three oxidation-based air-cleaning technologies were considered: photocatalytic oxidation (PCO), non-thermal plasma (NTP), and ozonation (O3). A total of 17 different configurations of EAC systems were tested for acetone and/or methyl ethyl ketone (MEK) removal. These include 12 different commercial PCO units, one in-house pilot PCO, two plasma, and two ozonation units. Sixteen of them were tested for the removal of 0.1 ppm MEK and their single pass removal efficiencies varied from 0 to 37%. Eleven of them were examined for the removal of 0.1 and 1 ppm of acetone and the removal efficiencies were between 0 and 23%. Ozonation and PCO-based system using ozone generating vacuum UV lamps generally showed a higher efficiency than PCO-based system with non-ozone generating UVC lamps or plasma units. Formaldehyde, acetaldehyde, and acetone were detected as the oxidation by-products in MEK testing. PCO-based systems tend to generate more by-products.
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