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Browse Prior Art Database

Fan Airflow Recirculation Controller

IP.com Disclosure Number: IPCOM000113322D
Original Publication Date: 1994-Aug-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 4 page(s) / 142K

Publishing Venue

IBM

Related People

Hall, D: AUTHOR [+2]

Abstract

Disclosed is an automatic shutter device which prevents airflow re-circulation when a fan has failed in a high availability multi-fan cooling package. The invention is applicable to any type fan or blower.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Fan Airflow Recirculation Controller

      Disclosed is an automatic shutter device which prevents airflow
re-circulation when a fan has failed in a high availability multi-fan
cooling package.  The invention is applicable to any type fan or
blower.

      Tube-axial fans are the air-moving devices generally used in
the air cooling designs of computer systems.  In high performance
computer servers and workstations, adequate cooling is critical to
function and reliability.  These systems use multiple fans for
adequate cooling of all components.  When a fan failure occurs, a
rotational speed sense signal line automatically issues a signal
indicating failure.  In a high availability system such as the SMP
Rack, 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.

      In the upper Media and Power supply area of the SMP Rack,
redundant cooling for the media and power supplies is provided by
using multiple fans in parallel in a plenum to maintain distributed
airflow.  This is illustrated in Fig.  1.  The fans are such that the
minimum required volumetric airflow rate is still available when one
of the three fans has failed.  Fig. 2, generated by a Computational
Fluid Dynamics (CFD) mathematical model, shows the airflow,
demonstrated by vectors proportional to velocity, adequately
distributed to cool the upstream media devices and downstream power
supplies when all fans are functional.  Fig....