Plastic Film Fan Valve for Backflow Prevention in Multi-Fan Plenum Cooling Systems
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Schneebeli, K: AUTHOR [+1]
Disclosed is a method which overcomes backflow through a failed fan.
Plastic Film Fan Valve for Backflow Prevention in
a method which overcomes backflow through a failed
any system using multiple fans that pressurize or
pull from a common plenum area, there is air recirculation if one fan
fails. When a fan fails, not only is the airflow it was providing
lost, but some of the airflow from the other fans is now free to flow
backwards through the failed fan and bypass the system to be cooled.
For systems that cannot afford to be down until the
failed fan is
replaced, extra fans need to be incorporated into the design, many
times requiring two more fans than necessary to cool the system with
no fan failures. For example, if three fans are sufficient to cool a
system, five fans are required to allow one to fail and keep the
system running, since the airflow from one fan is lost, and a hole is
created by the failed fan that diverts air needed to cool the system.
to cost, space may limit the number of fans that
can be used. Increased electrical complexity, power requirements and
acoustic noise are also factors that make using two extra fans
reverse airflow through a failed fan could be blocked,
then fewer fans could be used to cool a system, or a system that
normally would need to be powered down when a fan fails may be able
to stay up. That is precisely what this device does. This "fan
valve" is a thi...