日本語サイトへ

JACA (Japan Air Cleaning Association)

The Abstracts of the paper carried by the Journal of JACA

vol.55-4(2017/11/30)

Air quality control and strategies for preservation of cultural property in museum

Air pollution in museums is serious problem for conservation of cultural objects worldwide.  Especially, outdoor pollutants is heavy situation in the developing countries and the countermeasures are necessary for maintain the purification of indoor air.  In this article, framework of cultural property protection and its change in near future is described at first.  Secondary, investigation methods and their countermeasures are summarized for the protection of cultural properties, including papers such as acetic acid dissipation behavior from plywood.  At last, domestic and overseas trends on air pollutant regulation in museums are summarized.

Air conditioning plan for the AKAGANE MUSEUM

Akagane Museum is an integrated cultural facility located in Niihama city, Ehime Prefecture. The owner required environmental road reduction and easy maintenance in this building, in addition to function as museum and hall. We paid attention to the air quality of the art museum in particular. In this paper, we report the facility outline and the plan of the museum area.

Field measurements of indoor airborne contaminants in a museum

In museums, air quality must be kept in proper cleanliness level for conservation of cultural assets. This paper reports the review of indoor air quality in museums and indoor air pollutants in a newly built museum by a simplified measurement such as gas detector tubes and an accuracy measurement. The measurements were conducted before and after the completion. As a result, during the construction of the museum, high concentrations of organic acids and ammonia were detected in the storage room. After the completion of the museum, concentrations of those pollutants were kept lower than the guideline values. It was confirmed that chemical filters contributed to decrease pollutants sufficiently after the air conditioner had begun to work.

Air filter and air purification technology used in museums

The indoor air environments of office buildings and large stores are decreed by Act on Maintenance of Sanitation in Buildings, and the building subject to this application also includes national galleries, museums and libraries.
This law determines particle matter, carbon monoxide, carbon dioxide, temperature, humidity, airflow (flow rate), formaldehyde as the standard of air environment, and conservation of cultural properties requires effective approaches to purify the air from chemical substances such as acids and alkalis.
In this article, we illustrate two types of filter, one is air filter which is suitable for purifying air of particle matter, and the other is chemical filter specialized in purification from acids and alkalis in national galleries and museum.

Development of air filter medium using nanocelluloses

Cellulose nanofiber (CNF) derived from plants is a promising nanomaterial expected to be applied in various fields. Freeze-drying of CNF dispersions in water/tert-butyl alcohol (TBA) mixture was applied to prepare CNF porous materials. TEMPO-oxidized cellulose nanofibrils (TOCN) were used as CNFs. The TBA concentration in water/TBA mixture was an important factor to prepare CNF porous materials, and its optimum concentration was 20 to 50%. The resulting CNF porous materials had a very high specific surface area of about 300m2/g. For the purpose of improving a quality factor (QF) of air filter medium, CNF porous materials were formed inside glass fiber filter medium by impregnation of CNF/water/TBA dispersions followed by freeze-drying. The resulting CNF/glass fiber composite filter medium had a high QF value that was twice as high as the original medium. It was found that CNF was a very useful as a filter media material.

Thermal environmental simulation as an emulator

The concept of an emulator is a device for virtually trial and error operation of a system using simulation.  In this lecture, we explained the history and functions of thermal environmental simulation.  In order to apply it as an emulator, what is missing at present and it is clarified what kind of function is needed to be implemented in the future.  Finally, we introduced the emulator system currently under development at SHASE (Society of Heating, Air-Conditioning and Sanitary Engineering).