The anti-microbial cooling towers from Delta Cooling contain wide-spectrum
additives that operate on a cellular level to continuously disrupt and prevent
uncontrolled growth of microorganisms and biofilm.
By proactively making the switch to an advanced anti-microbial tower cooler,
paired with a very high efficiency HVAC chiller, the facility is also significantly
reducing energy costs.
Cooling tower design and materials can
be very significant in the prevention of
pathogen growth. To avoid problems of
stagnant water leading to pathogen growth,
experts recommend cooling tower designs
feature a sloped basin and/or basin sweeper
While some cooling tower manufacturers now market a tower with an anti-microbial fill (the medium over which
the hot water is distributed as it is being
cooled), a superior option is to have a
cooling tower featuring the fill, structural
casing and sump all composed of antimicrobial material.
Steve Keen, President of Powers of
Arkansas, the HVAC contractor responsible for the hospital project, recommended
installing an advanced cooling tower with
“Legionella is always a concern for HVAC
systems using a cooling tower and any where
you have water exposed to the atmosphere,”
says Keen. “The new antimicrobial properties will help prevent that type of growth
and exposure to patients and staff.”
ENERGY SAVINGS AND LONGEVITY
By proactively making the switch to
an advanced antimicrobial tower cooler,
paired with a very high efficiency HVAC
chiller, the hospital is also significantly
reducing energy costs, which was also a
“Our previous air cooled HVAC system
required a lot of electricity,” adds Hill.
“With the water-based cooling tower and
very efficient chiller, however, we expect to
save tens of thousands of dollars annually
Durability and longevity of the cooling
tower were additional issues that Hill
considered. Metal-clad cooling towers
are vulnerable to corrosion from salt air,
industrial gasses and even the chemicals
used to treat the recirculating water.
The best water treatments for legionella
prevention, in fact, are oxidizing biocides
that react aggressively toward metal
surfaces, effectively attacking metal-clad
cooling towers and shortening service life.
As a result, metal cooling towers require
downtime and eventual replacement.
In choosing an HDPE cooling tower,
which features a fill, drift eliminator and
shell all constructed of corrosion-proof
antimicrobial plastic, Arkansas Surgical
Hospital now has a system that is impervious to the corrosive effects of ambient
air and water treatment chemicals, as well
as oxidizing biocides—all of which plague
metal-clad cooling towers.
In addition, since the engineered
molded plastic cooling towers are one-piece, there are no problems with seams,
welds and patches that wear prematurely.
Therefore, the plastic models offer
extended longevity and require far
less downtime for cleaning, repair or
“In terms of lifecycle, our cooling tower
has a 20 year warranty on construction,”
concludes Hill. “You’d never get that with a
metal cooling tower.”
Joseph Kuhl, PhD., is V.P. of Engineering
at Delta Cooling. His antimicrobial HDPE
tower was specified for this project.