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Development of the Reduction System of Volatile Organic Compounds, including Formaldehyde, in Rooms- Shimizu Ventilation System -

by Makoto Yamaguchi, Yasushi Shibanuma, Takaaki Naritomi, Nobuhiro Miura and Kazuyuki Tomioka

Construction of new buildings in Japan are changing from the traditional well-ventilated ones to thermally insulated airtight ones to meet the increasing need to save energy and to provide comfortable thermal environments. If adequate ventilation is not maintained in these buildings, such problems arise as high humidity and dew condensation in the rooms. Allergies, sick house syndrome, and chemical sensitivity triggered by volatile organic compounds (VOCs), including formaldehyde, have become critical issues. This paper explains the amended Building Standard Law and introduces Shimizu Ventilation System, or a ventilation system developed by Shimizu Corporation as one of the most effective tools for taking measures against air contamination with VOCs, including formaldehyde, in apartments and office buildings. With the conventional ventilation system for apartments (Class 3) refined, the system consists of indoor and outdoor temperature sensors, intermediate fans with a multistage tap changer, and motor-driven damper for adjustment of ventilation rates. The system provides the precise control of air quality, particularly when the emissions of chemicals are large, such as after the new construction, remodeling, or renewal of buildings and in summer season. The system can efficiently reduce the concentration of chemicals in the rooms by automatically increasing the ventilation rates when the emissions of chemicals from building materials increase.