Building Management Hawaii February/March - (Page 27)
The cleaning power of UV light destroys
bacteria, mold and other viruses.
By Nate Gyotoku
Local Case Studies
Due to its high humidity, Hawaii is an ideal place for a
case study. For example, Iolani School installed UVC emitters
by Steril-Aire. For its mold problems, Iolani was spending
approximately $8,000 a year on coil cleaning and air handler
maintenance. For the initial test, UVC lights were installed
on a small, 6,500-cubic-feet-per-minute (cfm) unit, and
UV light in AHU applications can be used to control biological
growth on cooling coils. (Photo courtesy of Steril-Aire.)
After one year, Queen’s maintenance staff reported minimal
biofilm and slime buildup, and staff members noted the
absence of musty odors that were once commonly found.
Along with the benefit of improved air quality, UVC
emitters are energy efficient. Though the UVC emitters
consume energy, their clean coils allow for better heat
transfer and airflow. As a result, the air handler works more
efficiently and uses less electricity. The electricity savings
outweigh the cost of powering the UVC emitters. In some
cases, customers have realized utility bill reductions as high
29 percent, with an average payback
of less than two years. Adding to the
utility savings are the maintenance costs
involved with coil cleanings.
Nate Gyotoku, the new manager at AirReps Hawaii,
is a veteran of the information technology industry as
a consultant and project manager. Air Reps Hawaii
distributes Steril-Aire products in Hawaii.
LOW PRICES – FREE OAHU DELIVERY – HUGE INVENTORY
The main building at Iolani School, where UV lights help
control mold and improve the quality of indoor air.
before-and-after mold samples were taken. The “before”
samples contained an average of 2,087 colony-forming units
per millimeter (cfu/ml) versus the “after” samples that
contained an average of 26 cfu/ml. This resulted in a 99.8
percent reduction in mold-forming units after just a few
days of using Steril-Aire. Based on the results, Iolani School
outfitted the rest of its air handlers with UVC emitters.
The Queen’s Medical Center also installed UVC emitter
units. To combat microbes, such as tuberculosis, extra emitters
were added to the normal installation recommendations.
Visit our showroom at: www.admorhvac.com
2225 Hoonee Place • Honolulu, Hawaii 96819
(808) 841-7400 • (FAX) 841-7222
awaii boasts desirably pleasant weather year-round, but
the moist climate presents an old Hawaii problem—
mold. In our high-humidity climate, air handler maintenance
against mold and bacteria is a never-ending battle. An air
handler, or air-handling unit (AHU), is a device used to
condition and circulate air as part of a heating, ventilating
and air-conditioning (HVAC) system. Mold can accumulate
and grow on the coils and in the drain pan, where
condensation creates a desirable growing environment.
There are a few different methods of reducing exposure to
mold and other organisms. Chemical coil cleaning removes
visible biofilm but does not eradicate all microscopic organisms.
And filters can capture germs, but only microorganism that are
larger than 0.1 microns (depending on the type of filter).
Yet ultraviolet-C (UVC) light provides an excellent option
against mold and microorganisms. The ultraviolet “C” band
frequency is the most germicidal wavelength in the ultraviolet
spectrum. UVC lights destroy an organism’s DNA and RNA,
effectively killing or deactivating it. When applied to an air
handler’s cooling coil, the UVC eradicates biofilm and slime
buildup. A UVC system is also effective against viruses
such as influenza (the flu), SARS and measles, and bacteria
including TB and pneumonia that can pass through filters.
Table of Contents for the Digital Edition of Building Management Hawaii February/March
Top 3 Energy Incentives
On The Grid
Solar: Not A Singular Solution
Saving Money & Art
Top 10: Turn Energy Into Value
AC: Light-Zapping Clean
Does Your HVAC Talk BACnet?
Editorial: Industry Insights
Association Updates & Industry News
Ask An Expert: No One Likes To Sag
Building Management Hawaii February/March