Indoor air quality and thermal environment of elementary schools in winter in Tohoku District of Japan

Kuniaki Mihara, Hiroshi Yoshino, Norie Takizawa, Takashi Kurabuchi, Satoru Muramatsu, Kazukiyo Kumagai, Miyuki Noguchi, Yukio Yanagisawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study aims at investigating the actual conditions of indoor environment in schools in order to obtain fundamental information for proper ventilation design for buildings. Indoor environment of two new elementary schools in Tohoku district of Japan was investigated for a week in the winter of 2005. Temperature and humidity, concentrations of carbon dioxide (CO 2), ventilation airflow rates, concentrations of chemical substances, and the opening condition of the windows and doors were measured and recorded in the three classrooms of each school. The CO 2 concentration was higher than 1500 ppm in many hours due to the lack of enough ventilation in classroom and corridor. Exhaust airflow rate was only 10 percent of the design values. This is due to no maintenance of the ventilation systems and no cleaning of filters. It was observed that meshes for protecting insect of the outlet of exhaust ducts. Maintenance of ventilation system is very important in order to increase exhaust airflow rate and improve indoor air quality. Fresh air was supplied 80 percent from the windows and doors facing corridor by passive method. But air supply from the corridor should be avoided if the air along corridor would be contaminated.

Original languageEnglish
Title of host publicationIAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings
Subtitle of host publicationSustainable Built Environment
Pages639-644
Number of pages6
Publication statusPublished - 2007 Dec 1
Event6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007 - Sendai, Japan
Duration: 2007 Oct 282007 Oct 31

Publication series

NameIAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment
Volume1

Other

Other6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007
Country/TerritoryJapan
CitySendai
Period07/10/2807/10/31

Keywords

  • Airflow rate
  • Carbon dioxide
  • Elementary school
  • School buildings

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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