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Dual Fan N+1 Enclosure

IP.com Disclosure Number: IPCOM000103915D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Wenzel, EP: AUTHOR

Abstract

A dual fan enclosure can be used to increase the reliability and availability of an air cooled computer system. A single fan is replaced by two fans, operating in an n+1 mode, and a door check valve. One fan can be running with the other one in reserve or both fans can be running (at full speed or less). In either case, only one of the fans is needed for cooling. A fan which failed can be replaced without shutting down the machine. If the fan is replaced, the machine is reset and will have the life of the two fans available. If the fan is not replaced, the machine life will be extended by the life of the second fan. If both fans fail, the machine can shut down.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 60% of the total text.

Dual Fan N+1 Enclosure

      A dual fan enclosure can be used to increase the reliability
and availability of an air cooled computer system.  A single fan is
replaced by two fans, operating in an n+1 mode, and a door check
valve.  One fan can be running with the other one in reserve or both
fans can be running (at full speed or less).  In either case, only
one of the fans is needed for cooling.  A fan which failed can be
replaced without shutting down the machine.  If the fan is replaced,
the machine is reset and will have the life of the two fans
available.  If the fan is not replaced, the machine life will be
extended by the life of the second fan.  If both fans fail, the
machine can shut down.

      The dimension "W" is the approximate size of the fan diameter,
duct diameter and the distance from the common duct to the hinge.
The fans are mounted at an angle (approximately 30 degrees) so that
the door check valve is at a small angle of approximately 5 degrees
to the horizontal air flow.  This helps to hold the door check valve
against the air seal and prevents reverse air flow through the fan
which is not running.  The figure shows the top view of the enclosure
with fan "A" running, the door check valve in position (1) and fan
"B" off.

      The door check valve is mounted on a hinge in a vertical
position and is free to rotate anywhere from position (1) to (2) (see
figure).  When the door check valve is at position (1) or (2), it
will form an air...