Video Blog: How to Use the Cabinet Cooler Sizing Guide

Selecting the proper Cabinet Cooler to solve your electrical panel overheating problems is simplified by using the Cabinet Cooler Sizing Guide and allowing EXAIR Application Engineers to calculate which Cabinet Cooler will be best. It is important to size Cabinet Coolers properly to ensure the most efficient cooler is chosen and the proper NEMA rating is chosen for your cabinet. This video illustrates how simple it is to gather the information for a long term solution to heat related problems.

Cabinet Coolers install in minutes, not hours. They protect your electronics from seasonal hot weather spikes, normally high temperature environments, or too much heat dissipation from electrical components in an enclosure. EXAIR’s selection of Cabinet Coolers include NEMA 12, 4 and 4X ratings. They normally operate with a thermostat control to turn themselves on and off as needed throughout the years and this is the most efficient way to run them. They are available from stock to solve your problem quickly and will fit nearly any environment with a variety of materials (Aluminum, 303 stainless steel or 316 stainless steel) and temperature ratings.

If you have any questions, please contact EXAIR.

Brian Bergmann
EXAIR Corporation
Ph. 1-800-903-9247 (U.S. & Canada)   1-513-671-3322
Email: brianbergmann@exair.com

 

Calculate Heat Loads from the Sun for Outdoor Control Panels

I am always happy to see the sun rise each morning. But, electrical panels that are exposed to the sun are not.  Solar heat adds significant BTU’s to the overall heat load in an electrical panel.

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A customer had a VFD to control a 300HP blower motor for a dust collection system. The VFD was getting an over-temp error and shutting down the system.  He contacted EXAIR to get a Cabinet Cooler to keep the VFD cool.  We went through our normal questions to determine the heat load, i.e. the size of the cabinet, the temperature inside, the temperature outside, the maximum external temperature and the desired temperature.  As we went through the questions, he stated that the cabinet was located outside.  This is not an issue for our Cabinet Coolers as EXAIR has NEMA 4 and 4X (IP66) Cabinet Coolers.  It did stem another question; was it under cover?  He mentioned that it was not.

NEMA 4 Cabinet Cooler
NEMA 4 Cabinet Cooler

Generally in calculating cooling capacities with our Cabinet Coolers, we size the units by adding the ambient heat load and the electrical heat load. With the panel exposed to the sun, this adds another component to the total heat load.  To get an estimation on the amount of solar heat, color becomes a big factor as the darker colors will draw more heat.  Here is a good approximation to follow:

Solar heating by color
Solar heating by color

In this application, the customer had a gray panel, a common color. With an exposed surface area of 16 ft^2 (1.47 M^2), we would have to increase the heat load by 16 ft^2 * 7 Watts/ft^2 = 112 Watts.  This equates to 112 Watts * 3.41 BTU/hr/Watt = 382 BTU/hr of added heat.  (Or 112 Watts * 0.86 Kcal/hr/Watts = 96 Kcal/hr).

If an electrical panel is outside and cannot be shaded from the sun, we can still protect the sensitive components inside.  With the proper sized Cabinet Cooler, your equipment will remain running cool.  If you need help to determine the correct Cabinet Cooler, inside or out, you can either contact an Application Engineers at 800-903-9247 or fill out our Cabinet Cooler Sizing Guide.

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

 

“The sun” image courtesy of Lima Andruška, https://creativecommons.org/licenses/by-sa/2.0

Calculating Heat Load & Selecting A Cabinet Cooler System

“I need one of your Cabinet Coolers for my control panel, the dimensions are 24″ H x 30″ W x 16″ D, what do you recommend?”. This is a very common inquiry we receive when discussing our Cabinet Cooler Systems for the first time with a potential customer. While it would be nice if it was a simple as using just the dimensions, there is more that goes in to making the proper selection.

Following explains how to go about calculating and choosing a Cabinet Cooler System. If, at any time, you prefer EXAIR to calculate and assist with your choice – contact our Application Engineering department and we will be happy to get you up and running.

Our Cabinet Coolers are sized by cooling capacity in Btu/hr., which range from our lowest of 275, up to our largest Dual System providing 5,600 Btu/hr. Now if you know the Watts loss , we can convert this over to Btu/hr. (Watts X 3.41 = Btu/hr.). If you are unsure, we need to determine the current heat load of the cabinet by using the dimensions, current temperatures (internal and external) and worst case external temperature and the desired temperature you are looking to maintain inside the enclosure. To simplify this process, we offer our Cabinet Cooler Sizing Guide.

Sizing Guide
EXAIR’s Cabinet Cooler Sizing Guide

The current internal and external temperature will determine one of your ΔT’s (temperature differential), which is used to determine a multiplier from the table below. We then take your maximum external temperature and your desired internal temperature to give us another ΔT and multiplier. Use the sq. ft. of the cabinet and multiplying it by the temperature conversion multipliers. Add these sums together to determine the total heat load in Btu/Hr. This value will help you to choose the proper Cabinet Cooler system to solve your heat problem.

Temp Conversion Table

Now that we have the heat load properly calculated, we need to know the NEMA class of the enclosure. We offer NEMA 12 for general use where there aren’t any corrosives or liquids present, NEMA 4 for wet or damp environments and NEMA 4X for wet, corrosive applications.

We offer Thermostatically Controlled Systems with available voltages of 120VAC, 240 VAC or 24VDC. This is the most efficient means of operation as the unit only operates when the internal desired temperature is exceeded. In addition, we also offer Continuous Operating Systems, providing constant cooling and positive pressure into the cabinet. Each system  includes a filter separator for the supply line to keep water and dirt from entering the cabinet as well as duct tubing.

Of course, if you need any additional assistance, you can always contact one of our application engineers. If you can provide a little bit of information, we can do the calculating and get you on your way.

Justin Nicholl
Application Engineer
justinnicholl@exair.com
@EXAIR_JN

Summer Returns & So Does Heat Related Damage to Electrical Cabinets

Summer has not officially arrived in the Northern Hemisphere, according to the calendar, but temperatures have started to push 90 degrees Fahrenheit here in Cincinnati. As the temperatures increase, your electronics may start to feel the heat. High temperatures can cause circuits breakers to trip, controllers to shutdown, and connectors to be very sensitive.  We have seen electronics lose machine control, report bad readings, or if the heat is not managed promptly, damage circuitry. EXAIR Cabinet Coolers Systems are a simple, quickly installed and effective solution to heat related problems. Beside being installed in minutes and shipping from stock, they have additional benefits over fans, air conditioners and heat exchangers.

During the heat of the summer, fans, air conditioners, and heat exchangers may fail when you need them most.  For instance,  a fan and a heat exchanger work because the temperature differential between the ambient temperature and the inside of a cabinet is large. As the temperature rises, the ambient temperature goes up and a fan or heat exchanger lose their ability to remove heat from the cabinet. In a climate controlled environment this works great, in a hot plant floor without air conditioning, it is a recipe for failure.

So if fans aren’t a good solution you may turn to air conditioners in the summer because they can still produce very cold air at much higher ambient temperatures. You will need hours to install them, cross your fingers that they arrive undamaged, hope the condenser and other moving parts don’t fail and provide a drain for the condensate. If you are in a dusty environment, the filters will clog more often in the summer and require more maintenance. As the temperature rises the air conditioning systems run more often which means they pull in more air and particulate that will clog the filters and lead to reliability problems in the compressor. This compressor is subjected to more of a work load in the summer and more airflow restriction, if the filters are not changed often. This may lead to more air condition filters during the summer months.

EXAIR compressed air operated Cabinet Coolers System are a great solution for cooling enclosures. They operated via vortex cooling which requires no moving parts or filters from the outside air.  They drop your compressed air temperature 50 degrees Fahrenheit.  Mounting requires a compressed air supply, a standard electrical knockout, and the locknut that comes with the Cabinet Cooler System. The cooling is produced immediately with no lag time. A Electronic temperature controller is a available to maintain a temperature of your choosing.

ETC Dual CC Systems
Cabinet Cooler with ETC

Cabinet Cooler Systems are maintenance free with a clean dry supply of compressed air. Recently, we tested a cabinet cooler that was over twenty years old that still tested to our production standard.  The customer was delighted to hear that is was working so well they wanted it returned.  Cabinet Cooler Systems are available for NEMA 12, NEMA 4 and NEMA 4X enclosures. Kits include compressed air filtration to keep water, dirt and oil out of your enclosure. If you see an open panel door this summer, look into a Cabinet Cooler Systems. We can help you beat the heat.

fan enclosure
Cabinet Coolers will help you avoid this situation.

EXAIR’s Cabinet Coolers are in stock and ready to ship to you same day if ordered by 3:00 pm EDT. You can have it tomorrow if you like.

Dave Woerner
Application Engineer
@EXAIR_DW
DaveWoerner@EXAIR.com

 

Keep it Cool…And Clean…And Dry

Summer is in full swing for us in the U.S.  The temperatures and humidity are high, the sun is shining, and EXAIR Application Engineers are calculating heat load for overheating electrical enclosures to help customers determine which Cabinet Cooler system will remove the heat and eliminate associated problems. With the variety of applications for EXAIR Cabinet Coolers comes a variety of problem solutions.  For example, we may cool the temperature of an enclosure, and, we may also prevent dust or water from entering the enclosure.

Cabinet Cooler Panel

This is exactly what EXAIR can offer in the application shown above.  As you can see, the enclosure has remained open in a dirty environment in an attempt to solve an overheating condition.  This, in turn, has allowed dirt from the surrounding area to enter the enclosure and infiltrate the electrical devices.  An attempt to solve one problem has created another.  By installing an EXAIR Cabinet Cooler, this end user is able to cool the electronic components AND keep the enclosure contaminant free, solving two problems with one device. Also note that keeping an electrical panel doors open exposes personnel to dangerous situations if they come in contact with the exposed wires and connections.

EXAIR Cabinet Coolers have the potential to end an overheating condition AND prevent dirt from entering the enclosure by creating a slight positive pressure inside the cabinet. There is no need to worry about water entering the enclosure if you are in a wash-down or high humidity environment because they are UL listed for NEMA integrities of NEMA 12, NEMA 4 and NEMA 4X. NEMA 12 integrity protects against dirt, dust, and oil. NEMA 4 integrity is dust tight, oil-tight, splash resistant and indoor/outdoor service. NEMA 4X integrity offers the same protection as NEMA $ but is available in 303 and 316 stainless steel to provide for food service and corrosion resistance. To find out more about what an EXAIR Cabinet Cooler can do for your application, contact an Application Engineer.

Lee Evans
Application Engineer
LeeEvans@EXAIR.com
@EXAIR_LE

Gardens & (Failed) Quick Fixes

With the stretch of hot weather we are having and the rain we got last week my garden at home is absolutely out of control.  At least it was until I spent a good two to three hours picking weeds and grass out of the garden. This year we doubled the size of our garden from last year.  When I did the garden last year I dug out most of the sod and it really helped cut down on the grass in the garden.  When we expanded this year though I was just a little too busy to get the sod dug out and when a good friend tilled the garden for me he churned all the grass into the area.   This was fine as he did it for free and I didn’t have to do it; but now I am paying for it.   The grass that was in that area is now growing faster than anything else in my garden and was actually choking out all of the onions I had planted.

First I tried to quick fix problem by throwing more dirt over top of the grass to smother it.  That worked for about a day.  So I did what I had to do, I got in on my hands and knees and picked every little bit of grass out, roots and all.   By the end of the next day the onions had all perked up, the tomatoes continued blooming and the zucchini look to be the first vegetable we will enjoy eating.

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The fact of the matter is that I didn’t take time to make sure everything was in order before expanding the garden.  I didn’t remove the sod, communicate that I preferred the sod out, or mention to my friend that if not removing the sod please chop it up well (a hard thing to state when your friend is doing you such a big favor).  Because of that I had to dedicated a good part of my day at home working on a problem I could have prevented.   The fact of the matter is a quick fix is just a temporary fix and it is only a matter of time before the real problem reappears and demands your attention.

cc fan

The same can be said when you band aid an electrical cabinet that is overheating by opening the door and putting a fan in it.   That doesn’t solve the problem, it may go away for a short moment, but then it will come back even worse. A fan will provide some temporary cooling but it will also deposit dirt and debris on to the electrical components (all that grime on the fan blades and guard is the same stuff being blown into your cabinet) which causes them to run hotter, short out, or burn.  So instead of using a quick fix give us a call and let us help you determine the correct Cabinet Cooler System to cool your cabinet and get the problem solved the right way. The reality of installing a Cabinet Cooler is it takes a short amount of time and effort to install. If compared to other cooling alternatives it may be considered a quick fix – but one that lasts years, is low maintenance, and reliable.

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Brian Farno
Application Engineer
BrianFarno@EXAIR.com
@EXAIR_BF

 

Cabin Fever

According to Webster, Cabin Fever is irritability, listlessness, and similar symptoms resulting from long confinement or isolation indoors during the winter. I definitely have it! My doctor gave me several ways to overcome it.

  1. Get outdoors – I did because I had to shovel out the drive. It did nothing but increase my irritability.
  2. Get Plenty of Sunshine – Not much of that around here. Sitting under a lamp did not seem to make much of a difference.
  3. Stay Active – I tried the treadmill but that is more boring than being cooped up.
  4. Make Your Environment More Cheery – I though about hanging up my sports memorabilia then I remembered both my baseball and football teams were one and out. How depressing!
  5.  Grow Indoor Plants – Hmm… not a good idea! Scratch that.
  6. Engage in Goal-Oriented Activity – I set a goal to beat the game Candy Crush. Let’s say it did not do much for reducing irritability. Need to get a new phone.
  7. Eat Good Mood Food like Turkey – Fried turkey legs and beer. Now that was the ticket!

So if you have Cabin Fever, you will have to find out what works for you. Rest assured that summer will come.
CoolerWith the coming of summer comes heat related problems. Factory interiors become hot and uncomfortable. You can always retreat to your air conditioned office or break room but the machine control panels cannot. They have to keep working in the dead of heat. The answer is the EXAIR Cabinet Cooler System.

EXAIR Cabinet Cooler Systems are a low cost, reliable way to cool and purge electronic control panels. Their compact design is a quick and easy install through an electrical knockout. With no moving parts they are virtually maintenance free.

Call our application engineers for assistance is sizing one up for your application. 1-800-903-9247

Joe Panfalone
Application Engineer
Phone (513) 671-3322
Fax   (513) 671-3363