EN 1886

Air handling units (AHUs) are devices that condition and distribute air throughout a building. They are typically used in commercial and industrial buildings, but can also be found in some residential buildings. AHUs play a vital role in maintaining indoor air quality and comfort for occupants.

The mechanical performance of an AHU is determined by a number of factors, including the fan, filters, coils, and controls. The fan is responsible for moving the air through the AHU and the ductwork system. The filters remove dust, pollen, and other pollutants from the air. The coils can be used to heat, cool, or dehumidify the air. The controls regulate the operation of the AHU to ensure that the desired indoor conditions are maintained.

Mechanical performance requirements for AHUs are specified in a number of standards, including:

• EN 1886 Ventilation for buildings – Air handling units – Mechanical performance
• Eurovent 4/12 – Air handling units – Performance rating and reporting
• AMCA 210- Laboratory methods of testing fans for rating purposes

These standards specify test methods and requirements for the following performance characteristics of AHUs:

• Airflow – The volume of air that the AHU can deliver at a given pressure
• Fan power – The power required to operate the fan
• Filter efficiency – The ability of the filters to remove pollutants from the air
• Coil heat transfer capacity – The amount of heat that the coils can transfer to or from the air
• Control accuracy – The ability of the controls to maintain the desired indoor conditions

The mechanical performance of an AHU is important for a number of reasons. First, it ensures that the AHU can deliver the required amount of air to the building. Second, it ensures that the AHU can maintain the desired indoor temperature and humidity levels. Third, it ensures that the AHU is energy efficient.

Here are some tips for improving the mechanical performance of an AHU:

• Select the right AHU for the application. Consider the size of the building, the climate, and the occupancy requirements when selecting an AHU.
• Maintain the AHU properly. This includes regularly cleaning and replacing the filters, and checking the coils for fouling.
• Optimize the AHU controls. Ensure that the controls are set to maintain the desired indoor conditions while minimizing energy consumption.

By following these tips, you can help to ensure that your AHU is operating at its best, providing a comfortable and healthy indoor environment for occupants.