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Browse Prior Art Database

Adjustable Fan Plenum

IP.com Disclosure Number: IPCOM000050406D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Mizzi, JV: AUTHOR

Abstract

Computer system are often packaged in a card on mother board configuration wherein a number of cards are plugged into a mother board. Depending on installed features, some of the card slots may be empty. Forced convection cooling is used blowing or sucking air through the cards. The area over which airflow is required is the entire width of the board and the height of the cards. A small fan can supply the volumetric flow required, but if it is mounted too close to the cards, it cannot supply air evenly to all the cards. Dummy cards or "turbulators" are sometimes plugged into the "missing card" slots to help provide even flow. Often two fans are needed because of the aspect ratio of the airflow area required.

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Adjustable Fan Plenum

Computer system are often packaged in a card on mother board configuration wherein a number of cards are plugged into a mother board. Depending on installed features, some of the card slots may be empty. Forced convection cooling is used blowing or sucking air through the cards. The area over which airflow is required is the entire width of the board and the height of the cards. A small fan can supply the volumetric flow required, but if it is mounted too close to the cards, it cannot supply air evenly to all the cards. Dummy cards or "turbulators" are sometimes plugged into the "missing card" slots to help provide even flow. Often two fans are needed because of the aspect ratio of the airflow area required. Cards vary widely in their cooling requirements; system logic requirements dictate their location on a board and "HOT" cards cannot always be placed directly over a small fan.

This article describes a plenum accessory which, when attached to a fan and placed directly under the cards to be cooled, distributes the airflow as needed. Moveable plastic strips are used to tailor the airflow. Empirical techniques (temperature measurements) can provide the exact placement of the strips. For large volume products, a custom plastic shutter with the proper openings can be stamped out, or the strips can be used in the field to adjust the airflow for the different installed features.

Fig. 1 shows a cross-sectional end-view of a fan plenum 1. Plenum 1...