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As a result of increasing energy costs and the importance of reducing CO2 emissions, air filter energy consumption has become the focus of attention.
Energy Efficient Air Filters
It is possible to reduce energy consumption that is produced by your filters by using more energy efficient air filters. However, there are a few changes that will need to be made to your air handling system to accommodate this.
If your fan is constantly operating at a fixed speed, this will lower the average pressure drop of the air filters. Consequently, this will produce an increased air volume flow rate. As a result, the fan may be operating in a region with lower efficiency which causes increased overall energy consumption. Energy efficient air filters require the speed of the fan to be adjusted to supply a constant air volume flow rate.
Air Filter Energy Consumption
The energy consumption of air filters can be determined using several factors:
- The volume flow rate
- Fan efficiency
- Operation time
- Average pressure drop
The pressure drop of an air filter increases during operation, this is due to the dust loading. Air filter energy consumption is calculated from the integral average of this pressure drop over a certain period of time.
As a laboratory test method, the average pressure drop is determined from an ASHRAE* dust loading of the filter as defined in the EN 779 standard.
What is the EN 779 Standard
Currently, air filter efficiency is classified by their average particle collection efficiency according to the European EN 779 standard.
The aim of the EN 779 standard is to define air filter efficiency with regards to energy efficiency operation. More importantly it provides guidance for selecting energy efficient air filters.