Armstrong Filtration

Serving the greater D.C., Northern Virginia, Baltimore, and Delaware areas

The Benefits of Proper Water Filtration

Energy Saving from improved heat exchanger efficiency
Optimized cooling system efficiency
Reduce operating and maintenance costs
Reduced downtime production losses due to poor cooling efficiency or system contamination
Reduced risk of Legionella outbreaks
Better Corrosion Control
Short Payback

Biofilm and Energy Use

While mineral scale formation is commonly believed to be the major cause of increased energy usage in heat exchanger operation, biofilm actually has a lower thermal conductivity (a lower number indicates a greater resistance to heat transfer) than common mineral-based scales. The following statistics illustrate this unappreciated fact: 

Biofilm has a thermal conductivity of just 0.6 

Thus, biofilm is over four (4) times as resistant to heat transfer as common calcium carbonate scale! Calculations show that a biofilm only 0.045 inches in thickness on the condenser tubes of a centrifugal chiller results in a 35% increase in chiller electrical power consumption. The economics of biofilm are astounding! As an example, consider a 200 ton chiller installation operating at a 50% annual average load with power at $0.10/kwh; the electrical power cost would be $52,560/yr. A biofilm thickness of 0.045 on the condenser of this unit would increase the annual power cost by $18,396.00. Annually, biofilm has been estimated to increase power costs to commercial and industrial operations in the United States by several billion dollars a year. 

Biofilm Control

Current biofilm control technology uses various costly, dangerous to handle, hazardous toxic chemicals such as: chlorine, ozone, dithiocarbamate, hydantoin, isothiazolin, and glutaraldehyde, commonly reffered to as "biocides". These hazardous chemicals are used to treat cooling systems scattered throughout our towns and neighborhoods. The resulting commonplace transportation, storage, handling, and use of these toxic chemicals represents severe safety and environmental risks due to accidental spills as well as the resultant toxicity of treated cooling tower blowdown. 

Specific Benefit:


Scale                   Thermal Conductivity 

Calcium Carbonate:                          2.6 

Calcium Phosphate:                          2.6 

Calcium Sulfate:                                2.3 
Iron Oxide:                                         2.9