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Browse Prior Art Database

Fan Airflow Recirculation Preventer

IP.com Disclosure Number: IPCOM000117825D
Original Publication Date: 1996-Jun-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Feinstein, P: AUTHOR [+3]

Abstract

Air-moving devices are commonly used in the cooling designs of computer systems. In high performance computer servers and workstations, adequate cooling is critical to function and reliability. Therefore, such systems use multiple fans for adequate cooling of all components. When a fan fails in a high availability system, it is required that the system continue to function; i.e., redundant cooling is required for the prevention of automatic shut-down and loss of data and productivity. The failed fan can be replaced at the earliest convenience. Redundant cooling is provided if multiple fans, acting in parallel to pressurize a plenum, deliver the desired airflow even in the event one of the fans has failed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 56% of the total text.

Fan Airflow Recirculation Preventer

      Air-moving devices are commonly used in the cooling designs of
computer systems.  In high performance computer servers and
workstations, adequate cooling is critical to function and
reliability.  Therefore, such systems use multiple fans for adequate
cooling of all components.  When a fan fails in a high availability
system, it is required that the  system continue to function; i.e.,
redundant cooling is required for the  prevention of automatic
shut-down and loss of data and productivity. The  failed fan can be
replaced at the earliest convenience.  Redundant cooling is provided
if multiple fans, acting in parallel to pressurize a  plenum, deliver
the desired airflow even in the event one of the fans has  failed.

      However, if one of the fans pressurizing a plenum fails, an
opening is created through which airflow can escape the plenum,
thereby decreasing airflow available for cooling downstream of the
plenum.  A recirculation cell is created, and air is moved in a
circular path through the failed fan and an adjacent operational fan.
The invention prevents such recirculation paths by automatically
closing the plenum opening created by a failed fan.

      The invention is comprised of a single shutter and a bracket
as illustrated in the Figure.  Shutter "a" is captured between fan
"c" and bracket "b" by the two top bolts (of four total) that attach
bracket to fan.  The shutter is free to pivot about its...