RABScreen chiller air intake screen
All cooling coils will get dirty with coil dust and this will reduce the overall performance of the equipment.
“When the coil becomes fouled with dirt and grime, it cannot provide complete or adequate heat transfer, a process that was predicated on a clean coil. The equipment’s compressor senses this and tries to overcome it by going to a higher system pressure. This consumes greater levels of electricity” Professor John Tomczyk
A 1mm layer of chiller coil dust or dirt insulating the coil fin can reduce efficiency by 21% and increase energy use by as much as 30%. It has the same effect on large or small condensers.