Open-loop cooling, an active technique to control heat in electronic applications, is an alternative to conductive enclosure cooling.
Fresh air is ventilated through the enclosure during this method of cooling, removing heat from the hot components. When an electronics system is installed in a generally hygienic and cool setting, such as an office building, data center, or light-duty factory, open-loop cooling may be used.
All open-loop cooling methods use ambient air to cool, therefore they may expose enclosed electronics to hazardous substances including dirt, water, metal filings, and corrosive gases. However, certain open-loop cooling methods, such filter fans, use filters to protect the interior of an enclosure against dust.
Various Cooling Options for Electronic Enclosures
Filter fans, fan trays, motorized impellers, blowers, and direct air-cooling systems are a few alternatives for providing fresh air to cool electronic enclosures (DACS).
In applications ranging from industrial motors to process equipment and controls, filter fans can reduce a variety of heat loads. Airflows for filter fans range from 16 to 571 cfm (28 to 970 m3/hr), making them suitable for a range of applications. Additionally, operators have a choice of Type 12, Type 3R, and Type 1 fans to meet various environmental needs.
With versions offered in many configurations, including side-mount, top-mount, and shallow-depth options to fit small areas, filter fans are a flexible open-loop cooling solution. There are also alternatives for reverse airflow, which can be used to force or draw air through surroundings with higher static pressure.
DACS (Direct Air Cooling Systems)
For exterior enclosures in uses including outdoor telecommunications equipment, industrial automation, outdoor kiosks and displays, and outside plant (OSP) applications, direct air-cooling systems offer adaptable, efficient heat removal.
DACS offer protection from external factors like water, dust, pests, and rain with hydrophobic filters or regular MERV 12 filters. DACS use quiet, fan-based technology to bring filtered ambient air into the enclosure to dissipate heat, making them a cost-effective substitute for closed-loop cooling solutions in some applications.