Learn how to keep your cooling tower water basin clean while saving energy, reducing water usage, lowering maintenance costs, and decreasing downtime. We discuss the pros and cons of 3 different tower water filtration methods then move to the factory floor for a demonstration of the Miller Leaman Turbo Disc water filter.
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This presentation was designed for Mechanical Engineers, Mechanical Contractors, Building Owners, HVAC Maintenance Supervisors, Directors of Maintenance. Basically, we are discussing the best ways to keep your cooling tower water basin clean and the benefits of doing so.
Time Stamp: 2:05
Powerpoint presentation discussing three common HVAC water filtration methods. Liquid-Solid Centrifugal Separators (similar to a Lakos separator), Sand Filters and Disc Filtration. We also discuss side stream filtration methods along with cooling tower sweeper piping.
Time Stamp: 18:51
Live Factory Demo Disc Filter. We go to the factory floor for a walkthrough of the machine and backflush cycle.
The biggest advantage of the Turbo-Disc filter over conventional sand filters is the low water use during the backflush cycle. For a 2,000 ton chiller plant a sand filter will use 2,628,000 gallons per year while the Turbo-Disc will only use 85,400 gallons per year.
The Automatic Turbo-Disc Filter is a fully automatic, self-cleaning disc filter system. Available in multiple micron sizes, the lightweight three-dimensional polypropylene disc media uses a minimal amount of backwash water (approximately 10 gallons of water per pod) relative to other automatic filters on the market.
The filters come complete with or without a pump - all packaged on a stainless-steel skid assembly. Filter systems are designed with a modular approach; multiple filter housings (pods) are manifolded together with stainless steel inlet/outlet manifolds. An onboard controller monitors the differential pressure across the filter, triggering an automatic backwash when dirty. Filter lid enclosures have a stainless steel quick-release band clamp assembly, enabling easy access to the disc cartridge for maintenance purposes.
Turnkey HVAC filtration systems can be custom engineered.
Who is Miller Leaman? Diversified Filtration Company Established in 1991
• 52,000 sq. ft. facility in Daytona Beach, FL
• Manufacturers of High-Quality Filtration Products
What we do: HVAC and Process Cooling Water Filtration focused on Full flow, side-stream, and slip-stream filtration of cooling tower water.
• Protection of chillers, heat exchangers, condensers, and other “wet side” components
• Process cooling or chilled water filtration
The problem:
• Cooling towers continuously scrub contaminants from the air
• Particulate can fouls heat exchangers, condenser tubes and other equipment
• Evaporation leads to concentration of contaminants
• Particulate provides a “breeding ground” for biological growth
How do the contaminants get into the water?
• Act as Air Scrubbers (typical 400 ton cooling tower moves over 100,000 CFM of air)
• Collect Contaminants
• Increased use of “Free Cooling” (more air / more contaminants)
Sources:
• The circulating water contributes solids contaminants
• Slime, algae, chemical residue, and calcium carbonate
• Particulate in make-up water
Consequences …
• Reduced operating efficiency
• Increased downtime
• Costly repairs
• Higher water treatment costs (chemicals)
• Shortened equipment life
• Solid contaminants will increase fouling factor
• An increase of 0.001 in fouling factor increases energy consumption by 10%
• Cooling tower life is typically determined by the life of the basin
• A layer of solid contaminants in the basin prevents penetration of corrosion inhibitors and other chemicals
• A solid contaminant layer is an excellent “breeding ground” for bacteria and algae
• Particulates can clog heat exchangers and spray nozzles, degrading flow distribution
• Clogged nozzles require maintenance and possible shutdown
The solution: Proper filtration of cooling water
• Increase efficiency of heat transfer devices
• Extend equipment life
• Reduce biological problems
• Compliments chemical and non-chemical treatment
• Reduce maintenance
