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Product testing, tightness of museum display cases

MEASURING THE AMOUNT OF AIR EXCHANGES IN MUSEUM CABINETS

Measuring air exchange rates in museum display cases is important because it allows for monitoring the air quality inside the case and whether the amount of available air is sufficient to protect the exhibits. Excessive air exchange rates can contribute to increased humidity, contaminants, or temperature fluctuations, which can harm the exhibits. Insufficient air exchange rates can, however, lead to the accumulation of harmful gases or moisture.

Methods of measuring air exchange rates in museum display cases:

Tracer gas method: A tracer gas of known concentration (often an inert gas in the context of the exhibits) is introduced into the display case. The rate at which this gas concentration changes within the display case is then monitored. Based on the changes in concentration, the number of air exchanges can be inferred.

Airflow sensors: Airflow sensors are installed inside and outside the display case. The difference in airflow can be used to estimate the number of air exchanges.

Monitoring changes in moisture or carbon dioxide concentration:

Monitoring changes in moisture or carbon dioxide concentration inside a display

case can also provide guidance on air exchange rates.

Computer simulations: Using computer models, airflow and changes in conditions

inside a display case can be simulated at different air exchange rates.

The Institute for Testing and Certification conducts air exchange rate

testing of museum chambers or display cases using the tracer gas method

in accordance with ISO 12569. After testing, the air exchange

rate (ACD) is obtained.

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