Elevated Temperatures Can Really Affect A/C
Panel Coolers
by johnball2014
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A food and beverage company contacted EXAIR, as they were having
some issues with their air conditioning panel coolers. The units were located
near ovens and the ambient temperatures were elevated. During the summer
months, the additional rise in temperature caused the air conditioning systems
to under-perform. The electronics were overheating and shutting down,
causing production stoppage. They needed a better way to keep the
internal circuits cool during the hotter months.
The cooling capacities of the air conditioning panel coolers
were over-sized to compensate for the high ambient conditions. With the
finicky nature of Freon systems, 8,000 BTU/hr units were required. With
the additional heat from summer, they had to continuously monitor and maintain the
condenser units to keep them from running too hot. This caused unneeded
strain to their maintenance department, as it took time away from their normal
duties. They decided to contact EXAIR to see if our Cabinet Coolers could help in this
situation.
Under normal conditions, refrigeration systems still have to be
maintained by replacing filters, cleaning condensers, and checking compressors
to prevent any failure. Under elevated ambient conditions, it is
very difficult to keep the Freon cool enough to operate adequately and the
refrigeration compressor from over-heating. EXAIR Cabinet Coolers do not
use Freon or compressors to cool. They use the power of a Vortex Tube which only needs compressed
air to generate cold air. With no moving parts to wear or unsafe
chemicals to leak, they can keep the electrical components cool inside a panel
for a very long time.
For sizing the EXAIR Cabinet Coolers, I needed some additional
details. I sent them the Cabinet Cooler Sizing Guide
to help me determine the correct cooling capacity. The information was as
follows:
Height: 2200mm.
Width: 800mm.
Depth: 800mm.
Internal heat load: 100 watts
Maximum Ambient: 70 deg. C
Required Internal Temp: 35 deg. C
NEMA Rating: NEMA 4X
Solenoid Voltage: 24Vdc
As an added note: they requested 316SS for anti-corrosion to be
used for the Food and Beverage industry.
From my calculations, the ambient temperature was generating
roughly 2,100 BTU/hr of heat on the external surface of the electrical
cabinet. The internal heat load was 100 watts or 341 BTU/hr.
Combining the values, the total heat load was 2,441 BTU/hr. For the air
conditioning units, they had to over-size the units to 8.000 BTU/hr of cooling
capacity to remove 2,441 BTU/hr of heat. This large difference is because
of the high ambient conditions. The EXAIR Cabinet Coolers do not have
Freon to keep cool; so, the need to over-size is not necessary. For the
above electrical panels, I recommended a model HT4840SS-316-24VDC Cabinet Cooler System.
The cooling capacity is 2.800 BTU/hr, and it will keep the electrical
components cool to 35 deg. C (95 deg. F) even during the hotter months of
summer.
With the EXAIR Cabinet Cooler Systems,
we can offer a variety of different options to accommodate different
applications. For the food and beverage company above, the
HT4840SS-316-24VDC was needed to meet the NEMA 4X rating of the panel and the
316SS construction for washdowns and corrosion resistance. The “HT” at
the beginning of the model number is for the High Temperature option.
This allows the Cabinet Cooler to operate in high ambient conditions between 52
deg. C to 93 deg. C (125 deg. F to 200 deg. F respectively). The system
comes with a filter, cold air distribution kit, a thermostat and a solenoid
valve. The thermostat is preset at 35 deg. C (95 deg. F) and operates the
a 24Vdc solenoid valve to reduce compressed air consumption. EXAIR stocks
many different sizes and options to help reduce any downtime. So, when an
A/C system quits or an electrical panel faults out due to overheating, EXAIR
can ship one out quickly to get the system up and running again.
If you have electrical panels over-heating or air conditioning
units under-performing, you should try an EXAIR Cabinet Cooler.
You can fill out the Cabinet Cooler Sizing Guide
and an Application Engineer can determine the best model to keep your
operations running; even during the summer months.
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