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 (87 inches)
Width: 800mm (31 inches)
Depth: 800mm (31 inches)
Internal heat load: 100 watts
Maximum Ambient: 70 deg. C (158 deg. F)
Required Internal Temp: 35 deg. C (95 deg. F)
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.
EXAIR
NEMA Type 4/4X Cabinet Cooler System
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 EXAIRCabinet Cooler.
You can fill out theCabinet Cooler Sizing Guide.
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