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Low Profile Aerodynamic Apparatus to Prevent Airflow Recirculation in Failed Fans in Electronic Enclosures

IP.com Disclosure Number: IPCOM000236027D
Publication Date: 2014-Apr-02
Document File: 3 page(s) / 47K

Publishing Venue

The IP.com Prior Art Database

Abstract

Described is a very low profile method of preventing air flow recirculation within an enclosure. Specifically related would be electronics enclosures where, in the event of a fan failure, air is prevented from passing in the opposing direction through the compromised region. Implementing this method within an electronics enclosure would allow for extra space within the enclosure for other components and also provide adequate recirculation protection in the event of a fan failure.

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Low Profile Aerodynamic Apparatus to Prevent Airflow Recirculation in Failed Fans in Electronic Enclosures

For air-cooled electronics enclosures, the failure of a given fan rotor can lead to undesirable air recirculation back through the air passages associated with the failed fan. Besides reducing the total airflow passing over the internal electronic components, depending on the system configuration, it may also allow pre-heated air to recirculate, increasing component temperatures further. Anti-recirculation flappers or doors have been used in the past to address this issue. Passive implementations are typically seen as an array of flexible flaps or weakly hinged doors that are blown open by the air pressure of a working fan but which close against some structure when the fan fails and air tries to recirculate. Other more complicated active systems may be embodied by a solid door or member that is actuated into the "closed" position via an electronic signal from the system itself when a fan failure is detected. In either the passive or active implementation, these solutions open in the flow direction and may require upwards of 10 mm or more of system depth to reach their fully open state. In today's market, more and more content is being integrated into the electronics chassis while chassis growth is viewed as prohibitive due to customer rack space and cabling needs. Thus, an anti-recirculation mechanism that utilizes less system depth would allow that system...