How Electrostatic Precipitators Work.
Electrostatic Precipitator Facts
- HEPA-like efficiency is available.
- Electrostatic Precipitators require the minimum amount of maintenance.
- Constant and consistent airflow day after day.
- Filtration components are cleanable, not disposable, which reduces the amount of landfill.
- Systems with automatic wash and PLC's are available.
- Life-cycle cost of an electrostatic precipitator is typically less than other filtration technologies.
Air is drawn into the unit to capture particles. The airborne particles pass through an electrostatic field and receive an ionised charge. The charged particles move into a collector, where each alternate plate is charged with the same polarity as the particles. This drives the particles to the second set of plates where an opposite charge attracts and collects the particles. The cleaned air is then exhausted.
Unlike media air cleaners that use replaceable filters that clog up when dirty, electrostatic precipitators contain permanent cells that can be washed, either manually or with an automatic wash system. The permanent cells, even when dirty, still operate at very low static resistances when compared to a media filter. This typically means motors are 1 to 2 sizes smaller, saving the operator energy costs, as well as the cost of disposing of dirty filters.
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If you have an older electrostatic precipitator that you have questions about or may be in need of a maintenance check, get in touch.
24.8 ASHRAE Systems and Equipment 1996 - "Electronic air cleaners can be highly efficient filters using electrostatic precipitation to remove and collect particulate contaminates such as dusts, smoke, and pollen. The designation electronic air cleaner denotes a precipitator for HVAC air filtration. This type of air cleaner can remove and collect contaminates with an average efficiencies up to 98%, when tested in accordance with ASHRAE Standard 52.1."
4.3.1 INDUSTRIAL VENTILATION A Manual of Recommended Practice 24th Edition - "The Penny or two-stage precipitator which uses DC voltages from 11,000-15,000VDC for ionization. It is the most practical collection technique for the many hydrocarbon applications where an initially clear exhaust stack turns into a visible emission as vapor condenses. Some applications include plasticizer ovens, forge presses, die-casting machines, and various welding operations. The pressure drop of an electrostatic precipitator is extremely low, usually less than 1"wg, therefore, the energy requirement is significantly less than for other (filtration) techniques."