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Communication Dans Un Congrès Année : 2012

Air stuffiness and air exchange rate in French schools and day-care centers

Résumé

A pilot survey was realised from september 2009 to june 2010 in 310 schools and day-care centers distributed in all regions of France including oversea departments. This experimental survey was carried on as part of the preparation of the mandatory control of indoor air quality in public buidlings. Three parameters were measured in 900 classrooms or child playrooms: benzene, formaldehyde, carbon dioxide (CO2). The last allows the determination of degrees of air stuffiness during children occupancy as well as the nighttime air change rate. The level of air stuffiness is represented by a score from 0 (no stuffy air) to 5 (extremely stuffy air), which depends on both the occurrence and intensity of CO2 concentration. Moreover, a simple audit of each building was realised in order to describe its characteristics, the equipments, user behaviour and outdoor environment. Results show varying levels of air stuffiness from one room to another: low or no air stuffiness in 30% of rooms, medium to high air stuffiness in 48% of rooms, and very high to extreme air stuffiness in 21% of rooms. The air in day-care centers is generally less stuffy than in schools, because of more favorable ventilation conditions and lower children density per square meter. At the opposite, the air in primary schools is generally more stuffy than in the other establishments. Air change rates were estimated from the decay of CO2 concentration by an automated method. The observed values are low with a median level around 0.2 ach in day-care centers and 0.1 ach in nursery or elementary schools. Mechanical ventilation system are installed in day-care centers 60% of the time, and in both nursery and elementary schools 20% of the time. The most frequent system is based on exhaust ventilation or balanced ventilation directly in the rooms.
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Dates et versions

hal-00747447 , version 1 (31-10-2012)

Identifiants

  • HAL Id : hal-00747447 , version 1

Citer

Olivier Ramalho, Corinne Mandin, Jacques Ribéron, Guillaume Wyart. Air stuffiness and air exchange rate in French schools and day-care centers. 10th International conference on Industrial Ventilation, Sep 2012, Paris, France. 6 p. ⟨hal-00747447⟩

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