The Required Amount of Ventilation Air for the Classroom and the Possibility of Air Infiltration through the Windows

The majority of education buildings in Poland are equipped with natural (gravity) ventilation, where the air inflow depends on the level of window airtightness. A complete statistical urban population of 50 school buildings in Czestochowa have been examined. The main issue to be clarified is the ans...

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Bibliographic Details
Published in:Energies (Basel) 2021-11, Vol.14 (22), p.7537
Main Authors: Lis, Piotr, Lis, Anna
Format: Article
Language:English
Subjects:
Air infiltration
Air leakage
Airtightness
Buildings
Carbon dioxide
classroom
Classrooms
Education
educational building
Heat recovery
Microclimate
Modernization
natural ventilation
School buildings
Urban populations
Ventilation
Vents
window air-tightness
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Summary:The majority of education buildings in Poland are equipped with natural (gravity) ventilation, where the air inflow depends on the level of window airtightness. A complete statistical urban population of 50 school buildings in Czestochowa have been examined. The main issue to be clarified is the answer to the following questions: Is it theoretically possible to supply enough air to meet the ventilation requirements with gravity ventilation? What is the airtightness of the windows at which it will be possible? The average technical conditions of windows in the analysed buildings were bad. However, only in the case in which high external air leakage coefficient a = 7.0 m3/(h m daPa2/3) (q100KL = 32.4912 m3/(h m) is the amount of air passing through the leaks similar to the quantitative ventilation requirements for classrooms. The quantity of air flowing from the outside through modernized windows that meet the technical requirements (a = 0.6 to 1.0 m3/(m h daPa2/3)) covers on average only about 12% and about 21% of the ventilation needs. Without installing additional vents in the rooms, or better yet, installing mechanical ventilation with heat recovery, meeting the ventilation norm requirements will be impossible.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14227537