Panel Builder US

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January 3, 2022

When cooling an electrical enclosure, the airflow is an important factor to consider. However, to add to the complexity, different cooling products use air differently.Here is a  "must know" concept to ensure success for your application.  In order to make this distinction, it’s important to know the difference between open and closed-loop cooling, and why one system may be the better option for a specific application:

OPEN-LOOP cooling describes a process that replaces the air inside a chamber with “fresh” cooler air from outside the chamber. Open-loop cooling is the most commonly used process when the available air supply is cool enough and clean enough to provide the required heat removal. Open-loop ventilation uses ambient air to remove the heat, and may consist of small muffin-type fans that exhaust or supply an electrical cabinet, with optional filters to prevent airborne aerosols and dust from entering the cabinet. Fans have the advantage of utilizing a minimum amount ofFigure_1.open.jpg cabinet space and will move a substantial volume of air where flow is virtually unimpeded. Cost and complexity is minimized with this type of ventilation process. Where density of components impedes airflow, packaged blowers or motorized impellers may be arranged to operate against these higher static pressures. With a rack enclosure, supplemental fan trays may be used to spot cool or supplement other air-moving devices.See Fig 1.

CLOSED-LOOP cooling describes a process that reconditions (reuses) the air inside an enclosure. Air conditioners and heat exchangers are examples of cooling products that use a closed loop. The purpose of this system is to prevent contaminated air from entering and causing damage to critical components, and when maximum internal cabinet temperatures cannot be maintained using open-loop ambient air cooling, closed-loop systems are used to satisfy this requirement. If the ambient air is hostile, containing dirt, oil, humidity or corrosives, this will adversely affect the performance or ultimate longevity of the components. Many applications using intricate electronic/electrical components require a closed-loop cooling system to dissipate heat buildup without introducing outside contaminated air. Air-to-air heat exchangers, water-to-air Figure_2.closed.jpgheat exchangers and air conditioning units are great options to cool a confined amount of air within an enclosure. Air conditioners have the added ability to maintain a temperature lower than ambient and reduce the humidity within the controlled space.See Fig 2.and watch the video.

 

 

 

 

 

 

 

 

 

 

 

In harsh environments involving high temperatures, heavy particulates, oil or chemicals capable of damaging components, ambient air must be kept out of the enclosure. Sealed enclosures are generally used, with closed-loop cooling consisting of two separate circulation systems in a single unit. One system, sealed against the ambient air, cools and recirculates the clean cool air throughout the enclosure. The second system uses ambient air or water to remove and discharge the heat.

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https://www.kooltronic.com/blog-article/20/do-you-know-your-first-step-when-choosing-a-cabinet-cooler

 


 Network Infrastructure Featured Product Spotlight

PB 10 Panduit 400This webinar presented by Beth Lessard and Keith Cordero will be highlighting three Panduit solutions that will optimize network equipment and cabling to ensure that your spaces are efficiently and properly managed to support ever-evolving business needs of today and beyond. Products that will be featured include PanZone TrueEdge Wall Mount Enclsoure, Cable Managers, and Adjustable Depth 4-Post Rack.

REGISTER HERE

 

 

 

 


 

Editor's Pick: Featured Product News


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The new contactors are rated 160A, 195A and 230A three-phase for motor control applications, and 250A, 275A and 350A in AC-1 category. They are available in both 3 and 4 pole versions.

They replace contactor codes 11B…, of similar ratings which have demonstrated their reliability and robustness over the years. The new size is more compact and efficient, in response to market demand.

Designed with special attention to the dimensions, the 3-pole contactors are just 105mm wide, like the equivalently rated moulded case circuit breakers (MCCB), so the starters are more compact and easier to be connected.

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ditor's Pick: Featured Article


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No industry sector is exempt from the benefits of applying energy efficiency, whether it's individual products or complete solutions. This spans across a very broad spectrum – from replacing bearings that don’t work properly, causing the engine to run poorly and consume more electricity, to complex systems, such as solar panel and photovoltaic power generation systems. Plus, air conditioning, heating, insulation, and any products and solutions that improve energy efficiency from a thermal point of view.

This is where thermal measuring instruments become essential. Thermal imaging cameras and environmental T&M, as a whole, are vital to monitor environmental data.

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Sponsored Content

Control Panel Solutions to Help You Solve Complicated Problems

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With businesses today insisting on accomplishing more for less, understanding the five critical areas of smart control panel design is more important than ever. At Panduit, we have the products and solutions to optimize space, improve productivity, gain protection from harsh elements, enhance safety and security, and enable greater connectivity. Discover innovative ways to build, improve, and maintain control panels.

 

Visit Our Site HERE


 

Article Feature - Monthly Industry Focus


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The Panel Extension PX3 from ABB protects and prevents costly downtime and equipment failure. PX3 features an externally mounted surge solution that can be physically attached to the top or bottom of any panelboard providing a reduced profile surge solution. Moreover, PX3 offers an internal disconnect option, allowing safer and easier repairs without having to cut power to the distribution panel.

 

 

 

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Sponsored Content

Electrify Your Enterprise

PBUS-ElectrifyYourEnterprise-200.jpgPower is vital to production, and well-designed control cabinets are key. Allied Electronics & Automation offers a comprehensive collection of control cabinet solutions including PLCs, HMIs, contactors, miniature circuit breakers, terminal block connectors, DIN-rail power supplies, pushbutton switches, motor starters, overloads, power relays, industrial Ethernet switches and AC drives engineered to keep your operations running safely, reliably and efficiently.

Learn more HERE.

 


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Littelfuse, Inc. has recently announced their new SMTOAK2 TVS Diode Series. Many of today’s high-power, high-surge-rating TVS diodes are only available in axial leaded packages. The compact, 2 kA 8/20 μs rated, surface-mount package SMTOAK2 TVS Diode Series allows electronics designers to achieve a more robust transient voltage, overvoltage protection, and lightning protection system while using less printed circuit board (PCB) space.

The SMTOAK2 TVS Diode Series is ideal for high-power-density applications that require robust protection in a small footprint.

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