Effects of ventilation improvement on measured and perceived indoor air quality in a school building with a hybrid ventilation system

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Vornanen-Winqvist, Camilla
dc.contributor.author Salonen, Heidi
dc.contributor.author Järvi, Kati
dc.contributor.author Andersson, Maria A.
dc.contributor.author Mikkola, Raimo
dc.contributor.author Marik, Tamás
dc.contributor.author Kredics, László
dc.contributor.author Kurnitski, Jarek
dc.date.accessioned 2018-08-08T10:01:36Z
dc.date.available 2018-08-08T10:01:36Z
dc.date.issued 2018-07-05
dc.identifier.citation Vornanen-Winqvist , C , Salonen , H , Järvi , K , Andersson , M A , Mikkola , R , Marik , T , Kredics , L & Kurnitski , J 2018 , ' Effects of ventilation improvement on measured and perceived indoor air quality in a school building with a hybrid ventilation system ' , International Journal of Environmental Research and Public Health , vol. 15 , no. 7 , 1414 . https://doi.org/10.3390/ijerph15071414 en
dc.identifier.issn 1661-7827
dc.identifier.other PURE UUID: 77873d1e-71b3-427d-a708-9dd6d13389c1
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/effects-of-ventilation-improvement-on-measured-and-perceived-indoor-air-quality-in-a-school-building-with-a-hybrid-ventilation-system(77873d1e-71b3-427d-a708-9dd6d13389c1).html
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85049808719&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/26962733/ijerph_15_01414.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/33077
dc.description.abstract Ventilation system design and operation may significantly affect indoor air quality (IAQ). The aims of this case study were to investigate the functionality of a supply air fan-assisted hybrid ventilation system in a newly built school building with reported IAQ problems and to determine the effects of ventilation improvement on measured and perceived IAQ. The ventilation system function was researched simultaneously with IAQ measurements, with an analysis of total volatile organic compounds (TVOC), single volatile organic compounds (VOCs), and indoor mycobiota, and with questionnaires about perceived IAQ. At the baseline, an operational error of the ventilation system was found, which prevented the air from coming into the classrooms, except for short periods of high carbon dioxide (CO2 ) concentrations. After the ventilation operation was improved, a significant change in indoor mycobiota was found; the dominant, opportunistic human pathogenic species Trichoderma citrinoviride found in settled dust in the classroom before the improvement was no longer detected. In addition, the concentrations of CO2, TVOC, and some single VOCs, especially toluene and decamethylcyclopentasiloxane, decreased. The analysis of the questionnaire results indicated that the perceptions of unpleasant odors and stuffy air decreased, although a statistically significant improvement in perceived IAQ was not observed. The results provided evidence that the properly controlled hybrid ventilation system operating in mechanical supply mode provided adequate ventilation and was effective in decreasing the concentrations of some indoor-generated pollutants. With simple ventilation adjustments, microbiological exposure from building structures might be prevented. en
dc.format.extent 18
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Volume 15, issue 7 en
dc.rights openAccess en
dc.subject.other Public Health, Environmental and Occupational Health en
dc.subject.other Health, Toxicology and Mutagenesis en
dc.subject.other 212 Civil and construction engineering en
dc.title Effects of ventilation improvement on measured and perceived indoor air quality in a school building with a hybrid ventilation system en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Civil Engineering
dc.contributor.department University of Szeged
dc.subject.keyword Hybrid ventilation
dc.subject.keyword Indoor air quality
dc.subject.keyword Indoor air questionnaire
dc.subject.keyword Mycobiota
dc.subject.keyword School building
dc.subject.keyword Trichoderma citrinoviride
dc.subject.keyword Ventilation
dc.subject.keyword Public Health, Environmental and Occupational Health
dc.subject.keyword Health, Toxicology and Mutagenesis
dc.subject.keyword 212 Civil and construction engineering
dc.identifier.urn URN:NBN:fi:aalto-201808084477
dc.identifier.doi 10.3390/ijerph15071414
dc.type.version publishedVersion

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