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Campano, M.A.; Fernández-Agüera, J.; Domínguez-Amarillo, S.; Sendra, J.J. (2016, 21-22 de enero). Characterization of the airtightness level in school classrooms in Mediterranean climate.

CONGRESO: Proc. of 17th International Conference on Ecosystems, Environment and Sustainable Development.

PÁGINAS: 21-24

CIUDAD: Paris (France)

ABSTRACT:
Outdoor-Indoor air exchange it is a key parameter in the environmental performance of the architectonic enclosures. Air exchange has direct effect over energy demand, thermal comfort and indoor air quality of the buildings. This aspect is noteworthy when applied to buildings with a high density of occupation and inhabitants are particularly sensitive, such as the cases of children. European ventilation standards establishes a minimum outdoor airflow for an adequate IAQ control, so in non-residential buildings (such as schools) a mechanical ventilation system with stages of filtration is mandatory. However in South European Schools, except most modern buildings, ventilation is usually relied both on uncontrolled infiltrations through the envelope and windows opening. An analysis of the air tightness level of a representative sample of school classrooms has been made in Southern Spain, which has allowed to establish representative values of infiltration of these classrooms which can affect both energy demand and occupant's thermal comfort. Main leak paths have been associated to their external envelopes. Pressurization/depressurization tests (Blower-Door Test) of 45 multipurpose classrooms with no mechanical ventilation system have been performed in 9 non-university educational buildings of the main climate zones of Southern Spain. Since classrooms of Southern Spain have two access doors, a measurement methodology with three tests per room is developed for better approximation to real airflow values in classrooms during their normal operation. In spite of having these two doors, as well as a high windows to wall ratio, it is shown that there is an adequate level of airtightness in the non-university classrooms under study, since all the n50 values obtained are lower than 9.0 ACH, with an average value around 7.0 ACH. However this shows that it is not possible to ensure an adequate level of outdoor air supply to ensure internal air quality.

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