EXAIR Cabinet Cooler Systems Stabilize Relative Humidity

EXAIR Cabinet Cooler Systems are able to cool your electrical panels using only clean, dry compressed air. Other systems such as cooling fans or heat exchangers use ambient air full of dust and humidity. The temperature of ambient air also fluctuates with the seasons and will be very warm in the summer months, which degrades their ability to cool as the temperature rises. One of the myths about compressed air cooling is that humidity from the compressed air source will enter the cabinet. A water/dirt filter separator will prevent condensate from entering the cabinet and since relative humidity is carried away with the hot air exhaust, relative humidity will stabilize to 45%. This video shows how quickly EXAIR’s Cabinet Cooler Systems will have an effect on relative humidity.

Dave Woerner
Application Engineer

EXAIR Cabinet Cooler Systems Control Humidity While Maintaining Internal Temperature

As the weather in the Northern Hemisphere changes over from winter to spring and temperatures start to climb, it is slowly becoming necessary for customers to utilize the Cabinet Cooler Systems to keep control panels cool.

One such situation involved a customer who was building a panel for his client in Malaysia. Malaysia is about 3 degrees north of the Equator, so it is what I would call a semi-tropical if not tropical environment. And such places are quite high in humidity levels. This customer had a client who was in the palm oil processing industry which is quite big in Malaysia. He needed a Cabinet Cooler System to generate about 1000 Btu/hr. of cooling power in a NEMA 12 type system. So I recommended he go with a 1700 Btu/hr. Cabinet Cooler System so he had plenty of capacity. I also recommended he go with 24 VDC thermostat control so he could easily pull the power out from within his panel and not have to run any new circuits.

As the customer duly noted, the fact that the Cabinet Cooler System purges the cabinet with clean, cool and dry compressed air allows for the humidity levels to hang down at a much lower level around 40 – 50% RH instead of up around 80 – 90%. This is attributed to the processing and drying of the compressed air at the production point before it is sent out to the facility and again at the point of use with the included, 5 micron, compressed air filter/separator that comes with each system.

Previously, the customer was using only the small, DC type fans to pull that hot, humid air through the panel which led to many corrosion issues and did not relieve the heat issue at all. With this new improvement, the end user no longer has to worry about such issues. Also, there is virtually no maintenance for this system which produces much longer up-times for the customer as there are no moving parts to wear out. Overall, it was a good recommendation in this case as the Cabinet Cooler System was handling multiple, previously negative issues. Now the pain has been taken away and the end user can move on to solving other, more pressing problems.

Neal Raker, Application Engineer

Humidity and Dust vs. EXAIR Cabinet Cooler

Often times, an end user or OEM will contact EXAIR for help with Cabinet Coolers. Most often the need comes from an installed cabinet experiencing overheating conditions.  But, there are a large number of applications seeking EXAIR Cabinet Coolers on the front end, before installation or even construction of the enclosure.

For example, an end user of our product overseas needed to cool a single circuit board to ensure continuous operation. Keeping the device cool and dry in an open environment would have proved difficult due to high local humidity.  So, an enclosure was constructed and an EXAIR Cabinet Cooler was used to not only regulate the air temperature, but also the stabilize relative humidity within the enclosure to 45%.

Cabinet Drawing

Another international end user sent me a number of schematics for a new installation.  The proposed enclosure is already in use in other locations, but is experiencing high rates of failure due to high levels of ambient dust.  Using the Cabinet Cooler Sizing Guide we were able to determine heat load and the proper Cabinet Cooler model number. A benefit beyond the cooling capacity of a Cabinet Cooler system, is the ability to place a positive purge on the enclosure. This purge is helpful in non-hazardous, dusty and dirty environments. The positive air flow into the enclosure prevents dust from entering (of course, any vents or filters will need to be sealed).

Whether the environment is humid or dusty, we have a suitable solution to cool an enclosure using EXAIR Cabinet Coolers. Contact an Application Engineer with any questions.

Lee Evans
Application Engineer