English  |  正體中文  |  简体中文  |  Items with full text/Total items : 18055/20253 (89%)
Visitors : 25108652      Online Users : 561
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/34539


    Title: A comprehensive analysis of the intervention of a fresh air ventilation system on indoor air quality in classrooms
    Authors: Chen, Yu-Hao
    Tu, Yen-Pei
    Sung, Shih-Yi
    Weng, Wei-Cheng
    Huang, Hsiao-Lin
    Tsai, Ying, I
    Contributors: Indoor Air Quality Research and Service Center, Chia Nan University of Pharmacy & Science
    Department of Environmental Engineering and Science, Chia Nan University of Pharmacy & Science
    Department of Occupational Safety and Health, Chia Nan University of Pharmacy & Science
    Keywords: natural ventilation
    co2 concentration
    pollution
    exposure
    schools
    health
    rates
    pollutants
    parameters
    buildings
    Date: 2022
    Issue Date: 2023-12-11 13:56:47 (UTC+8)
    Publisher: TURKISH NATL COMMITTEE AIR POLLUTION RES & CONTROL-TUNCAP
    Abstract: Adequate classroom air quality is vital to student health and learning outcomes. Prolonged periods of air conditioner use in enclosed classrooms may result in poor air quality. However, opening classroom windows may expose students to air pollutants if the outdoor air quality is poor. This study investigated CO2 and PM2.5 concentrations in 86 classrooms installed with air conditioners in elementary and middle schools in southern Taiwan, each additionally installed with a fresh air ventilation system equipped with an Ell-class filter. Enclosed air-conditioned classrooms generally have a CO2 concentration greater than 2500 ppm; occasionally, this figure reaches 3500 ppm. With the installed air ventilation system operating, the mean classroom CO2 concentration decreased to 1084 +/- 203 ppm, and the median CO2 concentration decreased to 1120 ppm. However, the CO2 concentrations of over half the classrooms remained higher than the concentration advised by the World Health Organization (1000 ppm). This high CO2 concentration was a result of the short distance (1.5-2 m) between the indoor air outlet and the recirculated air inlet resulting in a shortened circuit of air travel. Also, the initial filter installed over the indoor air outlet of the system reduced air penetration into the classroom. When the ventilation system was manually activated without activating the air conditioners, the median PM2.5 concentration measured at the indoor air outlet and the median classroom PM2.5 concentration were 2 mu g/m(3) and 20 mu g/m(3), respectively. This implied the presence of other sources of PM2.5 in classrooms, particularly ceiling and wall-mounted fans. The activation of these fans spread dust onto classroom furniture. Overall, fresh air ventilation systems providing filtered air improve classroom ventilation efficiency and indoor air quality by reducing CO2 and PM2.5 concentrations, but the cleanliness of fans and furniture must be maintained.
    Relation: ATMOSPHERIC POLLUTION RESEARCH, v.13, 101373
    Appears in Collections:[Indoor Air Qual Res & Serv Ctr] Periodical Articles
    [Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles
    [Dept. of Occupational Safety] Periodical Articles

    Files in This Item:

    File Description SizeFormat
    index.html0KbHTML136View/Open


    All items in CNU IR are protected by copyright, with all rights reserved.


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback