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JACA (Japan Air Cleaning Association)

The Abstracts of the paper carried by the Journal of JACA

vol.58-1(2020/5/31)

Comparison of indoor air environment between small & medium buildings and specific buildings

The statements on “The right to healthy indoor air” have been formulated at a meeting of the Working Group convened by the WHO European Centre for Environment and Health (WHO/ECEH) European Centre for Environment and Health (WHO/ECEH) in 2000. Therefore, regardless of the scale of a building, occupants should have the right to healthy indoor air. By the present “Law for Environmental Health in Buildings”, the target building, i.e., a specific building, is limited to the scale of larger than 3000m2 (school≧8000m2) of floor area from the standpoint of “unification management nature”, “control possibility”, and “totality”. The actual conditions of the indoor air environment of 2000-3000m2 called small & medium buildings have been clarified in the present study. By the comparison of indoor air environment (air temperature, relative humidity, CO2 concentration) between small & medium buildings and specific buildings, the findings show that it can respond in case of decreasing buildings’ floor area from 3000m2 to 2000m2.

Comparison of thermal environment evaluation between Act on Maintenance of Sanitation in Buildings and ISO standard in Japanese offices

Fifty years have passed since the establishment of the Act on Maintenance of Sanitation in Buildings in Japan. Indoor thermal environment of office buildings in different climate zones of Japan have been measured, and the results have been evaluated according to the current law and ISO 17772-1. All the buildings have generally satisfied the current Japanese standard except for relative humidity in winter. Only 13% has achieved the highest category I rating while more than 20% has been rated to be the lowest category IV in the ISO standard evaluation. Information on optinal methods for more sophisticated comfort evaluation is desirable to meet the current needs for air conditioning in buildings.

Characterization and current status of indoor PM2.5 in buildings

This paper reports about the indoor air quality for airborne particles, especially PM2.5 in buildings. PM2.5 in indoor air is affected by not only indoor emissions but also penetrations from outdoor air. From the field measurements in office buildings, the I/O ratios for the specific buildings, over 3,000m2 of total floor area that had the central air conditioning unit were relatively low because of medium performance filter in air conditioning units. Therefore, it is important for indoor PM2.5 to take into account of penetration factors of PM2.5 through air conditioning units in buildings.

Law for Environmental Health in Buildings
~From birth to future on air conditioning managemant~

Tokyo is a municipality with many large buildings equipped with the latest technology and actively conducting on-site inspections. For certain buildings, this law must ensure the sanitation of the building. On the 50th anniversary of the enactment of the Law for Environmental Health in Buildings, we will introduce initiatives from the start of legislation to the present, examples of drawing examination and onsite inspection when applying for bilding confirmation. Also, from the perspective of air-conditioning management, it shows maintenance management issues, including episodes.

Measurement and inactivation of DNA contaminants at regenerative medical facility

In regenerative medical facilities handling iPS cells and ES cells, processing of genetic manipulation is necessary. Therefore, if DNA contaminants are contaminated into these cells, the risk of unintended cell proliferation and canceration cannot be denied, and there is concern about a decrease in product yield and safety. It has been extremely difficult to verify how much the outcome has been obtained when treating DNA contaminants present in the sample, as they are colorless and odorless. We have already examined DNA degradation and its detection method by Real-time PCR. We will examine whether this method can be applied to this purpose in this report.

Study on the fresh air volume and the thermal loads of fresh air based on the actual data of outdoor CO2 density

The density of indoor CO2 which need to be controlled under the 1000ppm is closely influenced by the ventilation fresh air volume. We have measured the outdoor CO2 density at three places in Tokyo area and its environs, by using these data, we have calculated the ventilation air volume and the thermal loads for the model office buildings. The results show that the calculated ventilation air volume becomes from 225% to 300% larger than normal volume. And then, by increasin the amount of ventilation, the peak thermal loads become 25% higher than usual in summer, and 30% higher in winter.