INVESTIGATION OF ENVIRONMENT AND VENTILATION AMOUNT OF CLASSROOMS AT SCHOOL IN JAPAN

摘要

Decrease of ventilation and generation of the VOC from indoor construction materials have been pointed out as problems of the air contaminations in Japan. Therefore, the indoor measurement of"Formaldehyde and VOC" was obligated by the law. Since the air contamination has become a problem also in classrooms at school, the investigation of ventilation amount in classrooms has been proceeded with using a simple method of measurement (constant concentration attenuation method). According to the result of the measurement at 11 schools ( 14 classrooms ) with using CO2 as a tracer gas, the averaged rate of air circulation in a classroom was about 0.47 times/hour. And effective results were also obtained by the tests of the ventilation amount at schools where Energy Recovery Ventilators are installed for the purpose of energy saving. The VOC concentration measurement was also executed while investigating an accurate ventilation amount.