Elevated Temperatures Can Really Affect A/C Panel Coolers

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 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.

 

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

 

Photo of Sun by Alexas_FotosCCO Creative Commons

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