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Experimental investigation of the air flow and indoor carbon dioxide concentration in classrooms with intermittent natural ventilation

Santamouris Mat, Synnefa Afroditi, Asssimakopoulos M. , Livada Iro, Pavlou K., Papaglastra Marianna, Gaitani N. , Kolokotsa Dionysia, Assimakopoulos Vasileios

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URIhttp://purl.tuc.gr/dl/dias/245B6F19-68CD-4E34-A4D2-EDB88EDB1C92-
Identifierhttps://doi.org/10.1016/j.enbuild.2008.04.002-
Languageen-
Extent10en
TitleExperimental investigation of the air flow and indoor carbon dioxide concentration in classrooms with intermittent natural ventilationen
CreatorSantamouris Maten
Creator Synnefa Afroditien
CreatorAsssimakopoulos M. en
Creator Livada Iroen
Creator Pavlou K.en
CreatorPapaglastra Mariannaen
CreatorGaitani N. en
CreatorKolokotsa Dionysiaen
CreatorΚολοκοτσα Διονυσιαel
CreatorAssimakopoulos Vasileiosen
PublisherElsevieren
DescriptionΔημοσίευση σε επιστημονικό περιοδικόel
Content SummaryAir flow and the associated indoor carbon dioxide concentrations have been extensively monitored in 62 classrooms of 27 naturally ventilated schools in Athens, Greece. The specific ventilation patterns as well as the associated carbon dioxide concentrations, before, during and after the teaching period are analysed in detail. During the teaching period, only 23% of the measured classrooms presented a flow rate higher than the recommended value of 8 l/p/s while the mean daily fluctuation was close to 40%. About, 52% of the classrooms presented a mean indoor CO2 concentration higher than 1000 ppm. The specific experimental data have been compared against existing ventilation rates and carbon dioxide concentrations using published information from 287 classrooms of 182 naturally ventilated schools and 900 classrooms from 220 mechanically ventilated schools. The relation between the air flow rates and the corresponding indoor carbon dioxide is analysed and then compared to the existing data from naturally and mechanically ventilated schools. It is found that all three data sets present a CO2 concentration equal to 1000 ppm for air flows around 8 l/p/s. Specific adaptive actions to improve the indoor environmental quality have been recorded and the impact of indoor and ambient temperatures as well as of the carbon dioxide concentration on window opening is analysed in detail. A clear relation is found, between the indoor temperature at which the adapting action takes place and the resulting air flow rate. In parallel, a statistically significant relation between window opening and the indoor–outdoor temperature difference has been established.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-11-04-
Date of Publication2008-
SubjectNatural ventilated schoolsen
SubjectAir flow and indoor carbon dioxideen
SubjectIndoor air quality in schoolsen
Bibliographic CitationM. Santamouris, A. Synnefa, M. Asssimakopoulos, I. Livada, K. Pavlou, M. Papaglastra, N. Gaitani, D. Kolokotsa, V. Assimakopoulos, "Experimental investigation of the air flow and indoor carbon dioxide concentration in classrooms with intermittent natural ventilation," Energy and Buildings, vol. 40, no. 10, pp. 1833–1843, 2008. doi: 10.1016/j.enbuild.2008.04.002en

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