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- W2360816595 abstract "Objective To investigate the air quality in the passenger train with air-conditioning ventilation system.Methods Based on the stratified cluster random sampling,from January to October in 2009,a total of 108 train carriages with air-conditioning system were selected to conduct the hygienic survey in Hefei,including 30 third class carriages,28 third class sleeping carriages,24 dining carriages(coal was used in 12,electricity was used in 12) and 26 carriages with soft berths.PM10,bacteria count,air velocity,temperature,relative humidity,carbon dioxide inside the carriges were determined.The dirt retention quantity,bacteria count,fungus count,β-hemolytic streptococcus in the return air pipe were measured.The PM10,bacteria count,fungus count,β-hemolytic streptococcus at the point of air outlet were also determined.Results The qualified rate of carbon dioxide in carriages was only 59.3%,which was the lowest.The qualified rates of temperature,relative humidity,air velocity and PM10 were 67.6%,79.6%,91.3% and 98.1%,respectively.As for the bacteria count,all were qualified.The qualified rate of carbon dioxide in third class carriages was 36.7%(11/30),it was 50.0%(14/28) in third class sleeping carriages,in dining it was 70.8%(17/24) and in carriages with soft berths it was 84.6%(24/26),respectively.The qualified rate of bacteria count in the return air pipe was 15.6%,which was the lowest.The qualified rate of dust deposition at the point of air outlet was 51.5%,bacteria count in the return air pipe was 59.2%,PM10 in the return air pipe was 82.4%,fungus count in the return air pipe was 96.3%,fungus count at the point of air outlet was 98.9%,β-hemolytic streptococcus in the return air pipe and at the point of air outlet was 100.0%,respectively.There was positive relationship between the PM10 concentration inside the compartment and the PM10 concentration at the air outlet(rs=0.824,P0.001).There was also positive relationship between the bacteria count inside the compartment and the bacteria count at the air outlet(rs=0.521,P0.001).Conclusion The main hygienic problems are carbon dioxide pollution in the carriages and bacteria contamination in the return air pipe of air conditioning." @default.
- W2360816595 created "2016-06-24" @default.
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- W2360816595 date "2011-01-01" @default.
- W2360816595 modified "2023-09-24" @default.
- W2360816595 title "Investigation of Air Quality in Passenger Train and Hygienic Status of Air-Conditioning System" @default.
- W2360816595 hasPublicationYear "2011" @default.
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