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Ultrafine particles from a vented gas clothes dryer
AbstractUltrafine particles (∼10–100nm) were measured continuously for 18 months in an occupied townhouse. A major source was determined to be the gas clothes dryer. Although the dryer was vented to the outdoors it consistently produced an order of magnitude increase in the ultrafine concentrations compared to times with no indoor sources. Short-term peak number concentrations exceeded 100,000cm−3 on a number of occasions. The source strength was conservatively estimated at about 6×1012ultrafine particles produced per drying episode. These values are underestimates, since the part of the peak below 9.8nm was not measured. Averaged over 150h of operation, the number concentration showed a major peak at the smallest size measured (9.8nm) and a secondary peak at 30nm. Loss rates of the ultrafines due to diffusion, deposition, and particle growth (1–2h−1) were high compared to losses due to air exchange (0.1–0.6h−1). Considering the reported health effects of ultrafines, the widespread use of gas dryers, and the substantial amount of time that gas dryers are operated in many homes, it may be desirable to carry out further research to determine if the results reported here for a single dryer in one home are reproducible under different conditions.
Ultrafine particles from a vented gas clothes dryer
AbstractUltrafine particles (∼10–100nm) were measured continuously for 18 months in an occupied townhouse. A major source was determined to be the gas clothes dryer. Although the dryer was vented to the outdoors it consistently produced an order of magnitude increase in the ultrafine concentrations compared to times with no indoor sources. Short-term peak number concentrations exceeded 100,000cm−3 on a number of occasions. The source strength was conservatively estimated at about 6×1012ultrafine particles produced per drying episode. These values are underestimates, since the part of the peak below 9.8nm was not measured. Averaged over 150h of operation, the number concentration showed a major peak at the smallest size measured (9.8nm) and a secondary peak at 30nm. Loss rates of the ultrafines due to diffusion, deposition, and particle growth (1–2h−1) were high compared to losses due to air exchange (0.1–0.6h−1). Considering the reported health effects of ultrafines, the widespread use of gas dryers, and the substantial amount of time that gas dryers are operated in many homes, it may be desirable to carry out further research to determine if the results reported here for a single dryer in one home are reproducible under different conditions.
Ultrafine particles from a vented gas clothes dryer
Wallace, Lance (author)
Atmospheric Environment ; 39 ; 5777-5786
2005-03-21
10 pages
Article (Journal)
Electronic Resource
English