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Why Filtration-system ?




Filtration-system Introduction

The cooling tower and heat exchanger is same as the lungs and heart are to the human body; when either aren't working properly, it effects other parts of the body and your health suffers.

Similarly, when your cooling tower and heat exchanger isn't clean, the heat exchange process doesn't work efficiently and the health of your production and process cooling system suffers.

So If you are looking to protect only your chiller and heat exchanger from airborne debris which exist during summer when insects, paper, construction debris, birds and just about everything that blows in the wind and during the fall season when the trees drop their leaves, scattering them to the wind where they always seem to find their way to your cooling towers, these are a major contributor of cooling equipment fouling, this naturally effects operations.

One of the water-based filtration technologies can help you manage the debris that gets into the cooling water.

If on the other hand, you're looking for full process cooling system protection, then you should look at air Intake filtration, it will stop the debris from getting into your system in the first place.

If your system doesn't have effective filtration, the debris can clog the fill and get circulated and trapped in the heat exchanger where it can build-up, restrict water flow and cause your process equipment to malfunction due to overheating.

For industry to have the ability to reuse process water for secondary or even primary applications will go along way to help reduce a global reliance on valuable potable water resources.

Such a strategy can give a significant return on investment when you take into account the cost to purchase and dispose of water in its many applications.


How Filtration-system work

For cooling tower filtration, there are two general technologies:

  • Water Based Systems for which there are a few different variations
  • Air Intake Filtration Systems.
With water-based systems, the choices include basic water strainers that remove debris by simply passing water through a mesh strainer; sand filtration systems that remove debris by passing the water through sand and centrifugal separators that spin the water and remove the debris through centrifugal action.

In contrast, Air Intake Filter Systems remove the debris by filtering the air as it is being drawn into the cooling tower, keeping the debris out of the system in the first place.


Filtration-system benefits

Cooling Tower Filter Screens - Benefits as following:

  • Reduces / eliminates sludge build-up in the basin by significantly reducing bio-loading.
  • Prevents fouling of fill.
  • Prevents plugging of strainers, blow-down valves and heat exchangers.
  • Helps reduce algae growth by diffusing sunlight, which supports photosynthesis.
  • Reduces water treatment chemical consumption due to reduced bio-loading.
  • Dramatically reduces maintenance and repair cost, downtime and lost productivity.



How to select Filtration-system

If you are not currently using a Filtration-system as part of your process cooling system, then any filtration technology will give you more protection than you have now, however, selecting a solution best suited to your operation requires that you know what kind of debris is the problem and where it is getting into the system.

As a rule of thumb, " don't select a small debris solution to solve a large debris problem". Conversely, "don't select a large debris solution to solve a small debris problem".

There is clearly a place for both water based filtration and air intake filtration, be sure you're selecting the right filtration for your specific need.


Biological Fouling

  • What is the cost associated with downtime due to heat exchanger or cooling tower fouling or clogging? (Knowing this will help you justify your filtration system cost)
  • What type of debris is most problematic (can you see it or is it microscopic)?
  • Specifically what part of the system does the filter protect?
  • Which system provides the greatest filtration surface area (this can directly impact frequency of cleaning - the smaller the filter the more frequently it needs cleaning)
  • Can the system be installed without shutting down the cooling tower? (If the cooling tower must be shut down for installation, you need to factor lost productivity into the cost of your filtration system if it's not being installed during shutdown periods.)
  • What is the cost associated with both the filter and installation?
  • How easy is the system to install and maintain?



References:

Center for Disease Control - December, 2000 Article, MMWR - July 1994, National Institute of Environmental Health, American Society of Heating, Refrigerating and Air Conditioning (ASHRAE)


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