Air Exchange Rate (AER) and its significance in Museums
Understanding Air Exchange Rate (AER) in Museum Display Cabinets
In the world of museum curation and exhibit design, the preservation of artifacts and specimens is paramount. One critical aspect of preservation that often goes unnoticed by the general public is the Air Exchange Rate (AER). This measure is crucial in creating the optimal environment for the long-term preservation of items within display cabinets and showcases. Let’s explore what AER is, why it matters in museum settings, and how it can be managed effectively.
What is Air Exchange Rate (AER)?
Air Exchange Rate (AER) refers to the rate at which outdoor air replaces indoor air within a space. In the context of museum display cabinets, it specifically measures how frequently the air within a showcase is exchanged with the surrounding air in the museum environment. AER is typically expressed in changes per hour (cph), indicating the number of times the air within a cabinet is completely replaced in an hour.
The Importance of AER in Museums.
The control of AER in museum display cabinets is critical for several reasons:
Preservation of Delicate Items
Many museum exhibits, such as ancient manuscripts, textiles, and biological specimens, are highly sensitive to environmental conditions.
Fluctuations in temperature, humidity, and the presence of pollutants can lead to deterioration.
A controlled AER helps maintain stable conditions that protect these items from damage.
Preventing Contaminant Buildup
Over time, contaminants like dust, volatile organic compounds (VOCs), and other pollutants can accumulate within a display case.
A proper AER ensures that these contaminants are diluted and removed, reducing the risk of chemical and physical damage to the exhibits.
Managing Humidity and Temperature
While other systems primarily control humidity and temperature within display cabinets, AER plays a supportive role. By ensuring a steady exchange of air, AER assists in maintaining consistent environmental conditions, even as external conditions change.
Managing AER in Museum Displays
Effective management of AER in museum displays involves a combination of design considerations and technological solutions:
Sealed Display Cases
One of the simplest ways to control AER is through the use of sealed display cases. These cases are designed to minimize air exchange, allowing for more precise control of the internal environment. Seals and gaskets must be regularly inspected to ensure their integrity.
Active Climate Control Systems
Many modern museum display cabinets are equipped with active climate control systems that regulate not only temperature and humidity but also AER. These systems can be adjusted to meet the specific needs of the items being displayed, ensuring optimal preservation conditions.
Monitoring and Maintenance
Regular monitoring of environmental conditions within display cabinets is essential.
This includes tracking AER using appropriate sensors and maintaining climate control systems to ensure they operate as intended.
Routine maintenance helps prevent leaks and ensures that seals remain effective in controlling air exchange.