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

Piotr Lis and Anna Lis
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Piotr Lis: Faculty of Infrastructure and Environment, Czestochowa University of Technology, J.H. Dąbrowskiego 73, 42-201 Czestochowa, Poland
Anna Lis: Faculty of Civil Engineering, Czestochowa University of Technology, Akademicka 3, 42-200 Czestochowa, Poland

Energies, 2021, vol. 14, issue 22, 1-22

Abstract: 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 m 3 /(h m daPa 2/3 ) ( q 100KL = 32.4912 m 3 /(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 m 3 /(m h daPa 2/3 )) 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.

Keywords: educational building; classroom; window air-tightness; air infiltration; natural ventilation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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