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Air Purification at Data Processing Facilities - article | Bry-Air

Air Purification At Data Processing Facilities

BryairArticlesAir Purification At Data Processing Facilities

The presence of both the particulate and gaseous contaminants have the following consequences:

  • Airborne chemicals become dissolved in AC system condensate forming acids which can attack heat transfer surfaces.
  • The gaseous contaminants can corrode the delicate electronic circuitry of the computers and printers.
  • Airborne particulate collects on computer equipment and can affect performance of disk drives and tape equipment.
  • Smaller airborne particulate pass through filters on air conditioners/AHUs and foul heat transfer surfaces, reducing efficiency.
  • The presence of respirable particulate (less than 1 micron) and gas phase chemicals create an uncomfortable and unhealthy environment, causing health problems for employees.

TYPICAL AIRBORNE PARTICLE SIZE DISTRIBUTION IN AN EDP FACILITY

Particle Size (microns) Distribution
< 0.8 20%
0.8 5 30%
5 10 30%
10 25 10%
25 50 4%
50 250 4%
> 250 4%

TYPICAL GASEOUS CONTAMINANT LEVELS IN AN EDP FACILITY

Contaminant Contamination Level
(PPM)
Ammonia 1.4 – 16
Chlorine 0.004  0.006
Nitrogen dioxide 0.002  0.003
Ozone 0.1  0.3
VOCs (as Toluene) 0.1  0.2

AIR PURIFICATION METHODS FOR EDP FACILITIES

The optimum filtration system for electronic data processing facilities will address as many of the potentially offending materials as possible – gaseous and particulate. The recommended system would consist of:

  • 30% ASHRAE rated pre-filter – for removal of higher size particulate matter
  • bed of plain activated carbon media – for removal of general VOCs like toluene, xylene etc., other higher molecular weight hydrocarbons, chlorine
  • bed of acid impregnated activated carbon media – for removal of ammonia
  • bed of potassium permanganate impregnated activated alumina media – for removal of ozone, oxides of nitrogen, traces of chlorine, formaldehyde and other low molecular weight gaseous compounds
  • 90-95% ASHRAE rated final filter – for removal of dust generated from the media as well as the sub-micron particulate matter generated in the EDP environment

For controlling gaseous contaminants generated from within the EDP room

Provide stand-alone powered re-circulation air scrubbers, of the above configuration designed for at least 6 air treatment cycles per hour, inside the room.

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