ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 22
were in the cooler with the UV lamps on, even with twice
the incubation time of the control group.
Though UV-C traditionally is employed to disinfect
PHOTO B. Air curtain equipped with UV lamps.
Photo courtesy of Mars Air Systems
that, through continuous circulation and exposure to
the UV lamps, air within the cooler would be sanitized.
What's more, through the eradication of airborne pathogens
such as mold and bacteria, the shelf life of produce
and other perishable ingredients would be extended.
Open Petri dishes were placed at various locations
throughout the cooler, with the air curtain operating
as described. Over time, airborne pathogens settled on
the Petri dishes. After seven days, the Petri dishes were
removed from the cooler to incubate. A second set of Petri
dishes then was placed at the same locations as the fi rst
inside the cooler, with the UV lamps in the air curtain
turned off. After another seven days, the second set of
Petri dishes was removed from the cooler and allowed
to incubate. After seven more days, the growths on the
two sets of Petri dishes were compared (Figure 1).
Results. As might be expected, pathogen concentration
varied by cooler location. Most signifi cantly, there
was no detectable growth on any of the Petri dishes that
air traveling at velocities lower than those seen in air
curtains,6 the results validate the effectiveness of the
test's " hybrid " operational model-that is, UV lamps
continually powered, with the fan running at high speed
when the door is open and at low speed when the door
is closed. And while more mold than any other kind
of pathogen (subsequent analysis revealed at least four
distinct varieties in the control group) was collected, the
broad germicidal effectiveness of UV-C makes the operational
approach viable in environments where virtually
any airborne pathogen circulates.
Of course, a larger room may require additional units
for the same level of effectiveness to be achieved. Nevertheless,
the test results indicate a UV-equipped air curtain
can serve as a viable sanitization device. What's more,
its built-in light shielding and air-circulation capabilities
mean additional units could be installed wherever
needed-not just over a doorway-in a larger space.
Pollution Control
Of course, no sanitization procedure is perfect: UVGI
can achieve 100-percent sterilization only if operated in
a sealed chamber, where no new pathogens can be introduced
during the disinfection process. In their recommendations
for resuming social gatherings following
COVID-19-related shutdowns in 2020, however, the
FIGURE 1. Pathogen growth, walk-in-cooler experiment.
22
2023 AMCA inmot ion
www.amca.org
http://www.amca.org
ASHRAE Journal Supplement - AMCA InMotion - November 2023
Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - November 2023
Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - BB1
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - BB2
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 2
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 3
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 4
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 5
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 6
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 7
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 8
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 9
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 10
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 11
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 12
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 13
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 14
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 15
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 16
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 17
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 18
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 19
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 20
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 21
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 22
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 23
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 24
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 25
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 26
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 27
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 28
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 29
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 30
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 31
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 32
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 33
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 34
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 35
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 36
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover4
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