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

 

Editor's Pick: Featured Product News


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The new TXLN line comprises a series of metal enclosed AC/DC power supplies ranging from 18 to 960 Watt (split into 12 different power levels) and is designed for a wide range of industrial applications. The TXLN is an active replacement of the older TXL line and is built on the same design principals to make the transition to the new TXLN series as easy as possible. The model selection includes single, dual as well as triple output solutions to cover different applications requirements.

With a low-profile metal case and screw terminal block connection, they are easy to install in any equipment. Up to the 200 Watt models the TXLN power supplies are completely convection cooled and from 320 Watt and above they come with an internal fan. Above 100 Watt an active PFC (>0.95) function is added to the standard feature pool. All models in the TXLN line have universal input and comply with the latest industrial standard IEC/EN/UL 62368-1, European EMC standards and the Low Voltage Directive (LVD).

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Sponsored Content

Io Audio Technologies: JL and JLX Chassis Connectors

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 Io Audio Technologies JL and JLX Series XLR chassis connectors are perfect for high-noise environments like permanent installations or design-in applications where the termination method is solder cups. Options of different finishing’s, 3, 4, or 5 pins, male or female, and vertical or horizontal PCB mounting are available.

Learn more HERE.

 

 


 

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ditor's Pick: Featured Article


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Data acquisition, data logging and data analysis are required functions for most modern industrial control systems. The simplest and lowest cost way to provide these functions is often by using the same platform that’s providing real-time control—namely the PLC or the programmable automation controller (PAC).

A few years ago, this wasn’t possible as PLCs lacked the required processing power and data storage capability. But more powerful PLCs and the evolution of PACs has made it possible to perform many data acquisition tasks within the controller—saving money and providing an overall simpler system.

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Sponsored Content

Digitally Transform Your Switchgear

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Eaton’s Magnum circuit breakers with Power Xpert Release trip units enable system innovation by integrating connected devices, actionable data, and facility insights into your power distribution assembly

Watch the video and read more HERE.

 

 

 


 

Article Feature - Monthly Industry Focus


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binder offers connectors with D-coding in the M8 form factor as part of its 818 product series. The products are ideal for Industrial Ethernet applications with communication protocols such as EtherCAT, EtherNet/IP or PROFINET according to IEEE 802.3 via twisted-pair cables of the Cat-5e category. Accordingly, the 4-pin connectors enable the network connection of actuators and sensors of particularly small size with data rates of up to 100 Mbit/s.

Optimized for space-saving industrial sensor installations

Today, high-bandwidth Ethernet connectivity, beyond the field level and into the corporate data infrastructure, is a core component of automated processes in all branches of industry. In the Ethernet communication of modern production facilities, for example in drives control, properties such as clock synchronism, real-time capability and determinism, but also reliability and robustness are in demand. Use cases in such environments place special demands on the connection technology, both from a technological and an economic point of view. Connectivity solutions should be designed to be variable and scalable, and above all support users in machine and plant engineering in saving space and time during installation. In addition, secure locking and protection categories appropriate to the field of application are required. M8 circular connectors with screw locking, in accordance with the DIN EN 61076-2-114 standard, are optimized for such application conditions. Here, the M8 form factor in particular has proven itself in installations where space is critical; the use with miniaturized sensors is exemplary for this area of application.

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Sponsored Content

Sealevel Announces the HazPAC 10 Rugged Panel PC for Hazardous Environments

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Sealevel Systems, Inc. announces the HazPAC10 Rugged Panel PC. Designed for Windows 10 IoT Embedded, the HazPAC 10 delivers powerful Intel processing combined with a bright, LCD, five-wire resistive touchscreen. The HazPAC 10 features a fanless industrial computer with a wide -40°C to 60°C operating temperature. And for the most intense environments, the HazPAC 10 has a NEMA 4/IP64 front bezel and is certified by ATEX, IECEx, and for Class I, Division 2 (Groups A, B, C, D, T4).

Learn More HERE

 


 

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