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Experimental study of the human walking-induced fine and ultrafine particle resuspension in a test chamber
https://orcid.org/0000-0003-4283-3636
https://orcid.org/0000-0003-2796-1605
Abstract In this work, human walking-induced particle resuspension was studied in a full-scale wooden chamber. The mass-based concentrations of PM10, PM2.5, and PM1 and the number-based concentrations of particles sized from 0.01 μm to 1 μm were monitored using a Grimm MiniWRAS counter. Two flooring types were tested: linoleum and hardwood. It has been shown that only mixing with ceiling fan without air supply allows a well-mixed condition to be reached. In this condition and using mass-based and number-based balance equations, emission rates and resuspension fractions were estimated for different particle sizes. The results of the present work show that human walking significantly increases the indoor PM10, PM2.5, and PM1 concentrations. The average estimated PM10, PM2.5, and PM1 resuspension fractions were (2.1 ± 0.4) × 10−2, (4.0 ± 0.7) × 10−3 and (9.0 ± 0.6) × 10−4, respectively for hardwood and (6.3 ± 0.6) × 10−3, (8.9 ± 0.5) × 10−4 and (1.5 ± 0.3) × 10−4, respectively for linoleum. For particles of sizes ranging from 0.01 μm to 1 μm, resuspension fractions increase over several orders of magnitude with increase in particle size for the two floorings. For all particle sizes, the resuspension fractions for hardwood were larger than those for linoleum. No resuspension was recorded for particles smaller than 0.027 μm with linoleum. It has been highlighted in this work that using mass-based concentration underestimates the actual emission proportion of 0.01–0.1 μm particles of the total resuspended particles.
Highlights In indoor environments, ventilation by air supply without the use of a mixing fan does not ensure the well-mixed condition. Ultrafine particle concentrations in indoor environments can be affected by human walking. The importance of using the number-based concentrations to quantify the human walking-induced particle resuspension. The hardwood flooring is associated with higher resuspension fractions compared to linoleum flooring.
Experimental study of the human walking-induced fine and ultrafine particle resuspension in a test chamber
https://orcid.org/0000-0003-4283-3636
https://orcid.org/0000-0003-2796-1605
Abstract In this work, human walking-induced particle resuspension was studied in a full-scale wooden chamber. The mass-based concentrations of PM10, PM2.5, and PM1 and the number-based concentrations of particles sized from 0.01 μm to 1 μm were monitored using a Grimm MiniWRAS counter. Two flooring types were tested: linoleum and hardwood. It has been shown that only mixing with ceiling fan without air supply allows a well-mixed condition to be reached. In this condition and using mass-based and number-based balance equations, emission rates and resuspension fractions were estimated for different particle sizes. The results of the present work show that human walking significantly increases the indoor PM10, PM2.5, and PM1 concentrations. The average estimated PM10, PM2.5, and PM1 resuspension fractions were (2.1 ± 0.4) × 10−2, (4.0 ± 0.7) × 10−3 and (9.0 ± 0.6) × 10−4, respectively for hardwood and (6.3 ± 0.6) × 10−3, (8.9 ± 0.5) × 10−4 and (1.5 ± 0.3) × 10−4, respectively for linoleum. For particles of sizes ranging from 0.01 μm to 1 μm, resuspension fractions increase over several orders of magnitude with increase in particle size for the two floorings. For all particle sizes, the resuspension fractions for hardwood were larger than those for linoleum. No resuspension was recorded for particles smaller than 0.027 μm with linoleum. It has been highlighted in this work that using mass-based concentration underestimates the actual emission proportion of 0.01–0.1 μm particles of the total resuspended particles.
Highlights In indoor environments, ventilation by air supply without the use of a mixing fan does not ensure the well-mixed condition. Ultrafine particle concentrations in indoor environments can be affected by human walking. The importance of using the number-based concentrations to quantify the human walking-induced particle resuspension. The hardwood flooring is associated with higher resuspension fractions compared to linoleum flooring.
Experimental study of the human walking-induced fine and ultrafine particle resuspension in a test chamber
https://orcid.org/0000-0003-4283-3636
https://orcid.org/0000-0003-2796-1605
Abstract In this work, human walking-induced particle resuspension was studied in a full-scale wooden chamber. The mass-based concentrations of PM10, PM2.5, and PM1 and the number-based concentrations of particles sized from 0.01 μm to 1 μm were monitored using a Grimm MiniWRAS counter. Two flooring types were tested: linoleum and hardwood. It has been shown that only mixing with ceiling fan without air supply allows a well-mixed condition to be reached. In this condition and using mass-based and number-based balance equations, emission rates and resuspension fractions were estimated for different particle sizes. The results of the present work show that human walking significantly increases the indoor PM10, PM2.5, and PM1 concentrations. The average estimated PM10, PM2.5, and PM1 resuspension fractions were (2.1 ± 0.4) × 10−2, (4.0 ± 0.7) × 10−3 and (9.0 ± 0.6) × 10−4, respectively for hardwood and (6.3 ± 0.6) × 10−3, (8.9 ± 0.5) × 10−4 and (1.5 ± 0.3) × 10−4, respectively for linoleum. For particles of sizes ranging from 0.01 μm to 1 μm, resuspension fractions increase over several orders of magnitude with increase in particle size for the two floorings. For all particle sizes, the resuspension fractions for hardwood were larger than those for linoleum. No resuspension was recorded for particles smaller than 0.027 μm with linoleum. It has been highlighted in this work that using mass-based concentration underestimates the actual emission proportion of 0.01–0.1 μm particles of the total resuspended particles.
Highlights In indoor environments, ventilation by air supply without the use of a mixing fan does not ensure the well-mixed condition. Ultrafine particle concentrations in indoor environments can be affected by human walking. The importance of using the number-based concentrations to quantify the human walking-induced particle resuspension. The hardwood flooring is associated with higher resuspension fractions compared to linoleum flooring.
Experimental study of the human walking-induced fine and ultrafine particle resuspension in a test chamber
Benabed, Ahmed (author) / Boulbair, Amir (author) / Limam, Karim (author)
Building and Environment ; 171
2020-01-02
Article (Journal)
Electronic Resource
English
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